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Electrical conductivity and mineral composition of the imbibition solution of bean seeds during storage

Silva, Claudia Denise da; Pazeto, Mariana Silva Rosa; Vieira, Roberval Daiton
Fonte: Editora da Universidade Federal de Lavras (UFLA) Publicador: Editora da Universidade Federal de Lavras (UFLA)
Tipo: Artigo de Revista Científica Formato: 147-155
Português
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Processo FAPESP: 06/57900-0; O teste de condutividade elétrica tem sido usado para avaliar o vigor de sementes de muitas espécies, especialmente de fabáceas, como ervilha, feijão e soja. Assim, nesta pesquisa, objetivou-se avaliar o efeito da temperatura e do período de armazenamento sobre os resultados do teste de condutividade elétrica e da composição mineral da solução de embebição de sementes de feijão (Phaseolus vulgaris L.). Foram utilizados três lotes do cultivar IAPAR - 81 (grupo Carioca) e três do cultivar IPR - TIZIU (grupo Preto) armazenados a 10, 25 e 25-10º C (seis meses a 10º C e seis meses a 25º C). Ao longo de 12 meses de armazenamento, a cada três meses foram determinados: teor de água, germinação e vigor (envelhecimento acelerado e condutividade elétrica) e conteúdo de potássio, cálcio e magnésio da solução de embebição. As sementes das cultivares apresentaram comportamento semelhante no armazenamento. A redução no vigor das sementes de feijão armazenadas a 10º C foi verificada pelos resultados dos testes de envelhecimento acelerado e de condutividade elétrica. O armazenamento de semente de feijão em baixa temperatura (10º C) não influencia os resultados da avaliação do seu vigor pelo teste condutividade elétrica e a quantificação de cálcio...

Efeito do vigor e do tratamento fungicida nos testes de germinação e de sanidade de sementes de soja

Gomes, Delineide Pereira; Barrozo, Leandra Matos; Souza, Apolyana Lorraine; Sader, Rubens; Silva, Gilvania Campos
Fonte: Universidade Federal de Uberlândia (UFU) Publicador: Universidade Federal de Uberlândia (UFU)
Tipo: Artigo de Revista Científica Formato: 59-65
Português
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Soybeans seeds with different levels of vigour, treated and or no with fungicide were submitted to the test of germination in the sand and roll substrates of paper and the test of sanity. In test of germination, there were only significant differences between treatments that used soybeans with high vigour and with low vigour, regardless of the presence or absence of fungicide treatment, in the two substrates. The soybeans with low vigour no treated provided the largest percentages of seed contaminated with fungi, in contrast, the seeds with high vigour treated. There was only a slight contamination in soybeans with low vigour treated, unlike seeds with low vigour untreated, which showed the incidence of most fungi found. In the germination of seedlings normal, there are differences between treatments that used seeds with high vigour and low vigour, and is independent of the fungicide treatment and the type of substratum used. The effect of a fungicide depends of the vigour of seeds when of the occurrence of fungi associated to the soybean seeds of the cultivar analyzed.; Sementes de soja com diferentes níveis de vigor, tratadas e não tratadas com fungicida foram submetidas ao teste de germinação, nos substratos areia e rolo de papel...

Effects of irrigation on the vigour, yield and berry composition of the red variety Touriga Nacional at the Dão winegrowing region, Portugal

Gouveia, J.P.; Pedroso, V.; Rodrigues, P.; Martins, S.; Alves, I.; Lopes, C.
Fonte: Universidade Técnica de Lisboa Publicador: Universidade Técnica de Lisboa
Tipo: Conferência ou Objeto de Conferência
Publicado em //2011 Português
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Proceedings - 17 th International Symposium GIESCO, Asti, Italy, 2011; In a field trial installed at the Centro de Estudos Vitivinícolas do Dão, Nelas, Portugal, the effect of three irrigation treatments on the agronomic behaviour of cv Touriga Nacional (Vitis vinifera L.) were studied during three growing seasons (2006-2008). Three irrigation treatments (DI30 - irrigation with 30% of ETc; DI50 - irrigation with 50% ETc, FI - full irrigation – 100% Etc) were compared to a control non-irrigated treatment (NI). Compared to NI, the deficit irrigation treatments (DI30 & DI50) showed no significant differences on the yield and its components. The full irrigation treatment induced a significantly higher yield due to a higher bunch weight, as compared with the others treatments. Compared to the control, the deficit irrigation treatments presented similar berry composition during all the three seasons. The FI treatment presented, in all seasons, a significantly higher total acidity and a significantly lower Brix and total anthocyanins concentration as compared to the other treatments. The pruning weight and shoot weight increased with the amount of irrigation water applied, but significant differences were found only between the FI and the NI treatments...

Seed germination and seedling vigour of italian ryegrass, cocksfoot and timothy following harvest and storage

Stanisavljevic,Rade; Ðjokic,Dragoslav; Milenkovic,Jasmina; Ðukanovic,Lana; Stevovic,Vladeta; Simic,Aleksandar; Dodig,Dejan
Fonte: Editora da Universidade Federal de Lavras Publicador: Editora da Universidade Federal de Lavras
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2011 Português
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During post-harvest maturation, different species vary in the length of dormancy breaking or germination increases. Seed dormancy and slow seedling development often limit establishment of forage grass stands. Seed germination and seedling vigour of Italian ryegrass (Lolium italicum A. Braun, Synonym Lolium multiflorum L.), cocksfoot (Dactylis glomerata L.) and timothy (Phleum pretense L.) were observed after harvest and storage. After harvest in June, seeds were stored under standard storage conditions and sampled every 30 days after harvest (DAH), up to 270 DAH, and then every 60 days up to 990 DAH. At each date, seeds were tested for final germination percentage and for seedling vigour traits. Timothy seeds had a maximum germination (88%) and the best seedlings vigour at 90 DAH, which implies that early autumn (September-October) is the best sowing period for freshly harvested seeds of timothy. Timothy seed germination was poor from 270 DAH (73%). The best germination and vigour of Italian ryegrass and cocksfoot seedlings were between 270 and 330 DAH, which equates to spring sowing time (March-April) in the succeeding year. Cocksfoot and Italian ryegrass seeds maintained satisfactory germination levels up to 630 DAH (81%) and 810 DAH (81%)...

Electrical conductivity and mineral composition of the imbibition solution of bean seeds during storage

Silva,Claudia Denise da; Pazeto,Mariana Silva Rosa; Vieira,Roberval Daiton
Fonte: Editora da Universidade Federal de Lavras Publicador: Editora da Universidade Federal de Lavras
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2012 Português
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The electrical conductivity test has been used to evaluate seed vigour in many species, especially legumes, such as peas, beans and soybeans. The objective of this research was to evaluate the effect of temperature and storage period on the results of the electrical conductivity test and the mineral composition of the imbibition solution of bean seeds (Phaseolus vulgaris L.). Three seed lots of the cultivar IAPAR - 81 and cultivar IPR - TIZIU were stored at 10, 25 and 25-10º C (six months at 10º C and six months at 25º C) The following evaluations were made every three months for a year: seed water content, germination and vigour (accelerated ageing and electrical conductivity) and the potassium, calcium and magnesium contents of the imbibition solution. The cultivars showed similar behavior in storage. The reduction in the vigour of bean seeds stored at 10º C was verified by accelerated ageing and electrical conductivity tests. The bean seed storage at low temperature (10º C) does not influence the results of the evaluation of seed vigour by electrical conductivity test and the quantification of calcium, magnesium and potassium ions. The evaluation of vigour by the electrical conductivity test is not recommended for bean seed stored by long periods (above 9 months).

Accelerated ageing test to evaluate vigour in Jatropha curcas L. seeds

Oliveira,Glauter Lima; Dias,Luiz Antônio dos Santos; Dias,Denise Cunha Fernandes dos Santos; Soares,Marcos Morais; Silva,Laércio Junio da
Fonte: Universidade Federal do Ceará Publicador: Universidade Federal do Ceará
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2014 Português
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There is currently great interest in the cultivation of the Jatropha curcas L., known locally as physic nut, for the production of biodiesel, leading to an increase in the demand for seeds and precise information as to their physiological quality, especially vigour. The objective was to evaluate the efficiency of the accelerated ageing test, with variations, in verifying the vigour of Jatropha seeds. Four seed lots were initially characterized as to their physiological quality by germination and vigour tests. For accelerated ageing test, temperatures of 42 and 45 ºC were tested during 48, 72 and 96 hours. The experiment was carried out in a completely randomized design and the averages of the treatments compared by Tukey test (p<0,05). The Pearson correlation coefficients for the results of accelerated ageing against results from the other tests were calculated. The accelerated ageing test at 42 or 45 ºC for 48 hours is efficient to classify Jatropha seed lots according to vigour level.

Hybridization between crops and wild relatives: the contribution of cultivated lettuce to the vigour of crop–wild hybrids under drought, salinity and nutrient deficiency conditions

Uwimana, Brigitte; Smulders, Marinus J. M.; Hooftman, Danny A. P.; Hartman, Yorike; van Tienderen, Peter H.; Jansen, Johannes; McHale, Leah K.; Michelmore, Richard W.; van de Wiel, Clemens C. M.; Visser, Richard G. F.
Fonte: Springer-Verlag Publicador: Springer-Verlag
Tipo: Artigo de Revista Científica
Português
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With the development of transgenic crop varieties, crop–wild hybridization has received considerable consideration with regard to the potential of transgenes to be transferred to wild species. Although many studies have shown that crops can hybridize with their wild relatives and that the resulting hybrids may show improved fitness over the wild parents, little is still known on the genetic contribution of the crop parent to the performance of the hybrids. In this study, we investigated the vigour of lettuce hybrids using 98 F2:3 families from a cross between cultivated lettuce and its wild relative Lactuca serriola under non-stress conditions and under drought, salinity and nutrient deficiency. Using single nucleotide polymorphism markers, we mapped quantitative trait loci associated with plant vigour in the F2:3 families and determined the allelic contribution of the two parents. Seventeen QTLs (quantitative trait loci) associated with vigour and six QTLs associated with the accumulation of ions (Na+, Cl− and K+) were mapped on the nine linkage groups of lettuce. Seven of the vigour QTLs had a positive effect from the crop allele and six had a positive effect from the wild allele across treatments, and four QTLs had a positive effect from the crop allele in one treatment and from the wild allele in another treatment. Based on the allelic effect of the QTLs and their location on the genetic map...

The relationship between root hydraulics and scion vigour across Vitis rootstocks: what role do root aquaporins play?

Gambetta, G. A.; Manuck, C. M.; Drucker, S. T.; Shaghasi, T.; Fort, K.; Matthews, M. A.; Walker, M. A.; McElrone, A. J.
Fonte: Oxford University Press Publicador: Oxford University Press
Tipo: Artigo de Revista Científica
Português
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Vitis vinifera scions are commonly grafted onto rootstocks of other grape species to influence scion vigour and provide resistance to soil-borne pests and abiotic stress; however, the mechanisms by which rootstocks affect scion physiology remain unknown. This study characterized the hydraulic physiology of Vitis rootstocks that vary in vigour classification by investigating aquaporin (VvPIP) gene expression, fine-root hydraulic conductivity (Lp r), % aquaporin contribution to Lp r, scion transpiration, and the size of root systems. Expression of several VvPIP genes was consistently greater in higher-vigour rootstocks under favourable growing conditions in a variety of media and in root tips compared to mature fine roots. Similar to VvPIP expression patterns, fine-root Lp r and % aquaporin contribution to Lp r determined under both osmotic (Lp r Osm) and hydrostatic (Lp r Hyd) pressure gradients were consistently greater in high-vigour rootstocks. Interestingly, the % aquaporin contribution was nearly identical for Lp r Osm and Lp r Hyd even though a hydrostatic gradient would induce a predominant flow across the apoplastic pathway. In common scion greenhouse experiments, leaf area-specific transpiration (E) and total leaf area increased with rootstock vigour and were positively correlated with fine-root Lp r. These results suggest that increased canopy water demands for scion grafted onto high-vigour rootstocks are matched by adjustments in root-system hydraulic conductivity through the combination of fine-root Lp r and increased root surface area.

Seed germination and seedling vigour of italian ryegrass, cocksfoot and timothy following harvest and storage

Fonte: Editora da Universidade Federal de Lavras Publicador: Editora da Universidade Federal de Lavras
Tipo: Artigo de Revista Científica Formato: text/html
Português
Relevância na Pesquisa
27.465942%
During post-harvest maturation, different species vary in the length of dormancy breaking or germination increases. Seed dormancy and slow seedling development often limit establishment of forage grass stands. Seed germination and seedling vigour of Italian ryegrass (Lolium italicum A. Braun, Synonym Lolium multiflorum L.), cocksfoot (Dactylis glomerata L.) and timothy (Phleum pretense L.) were observed after harvest and storage. After harvest in June, seeds were stored under standard storage conditions and sampled every 30 days after harvest (DAH), up to 270 DAH, and then every 60 days up to 990 DAH. At each date, seeds were tested for final germination percentage and for seedling vigour traits. Timothy seeds had a maximum germination (88%) and the best seedlings vigour at 90 DAH, which implies that early autumn (September-October) is the best sowing period for freshly harvested seeds of timothy. Timothy seed germination was poor from 270 DAH (73%). The best germination and vigour of Italian ryegrass and cocksfoot seedlings were between 270 and 330 DAH, which equates to spring sowing time (March-April) in the succeeding year. Cocksfoot and Italian ryegrass seeds maintained satisfactory germination levels up to 630 DAH (81%) and 810 DAH (81%)...

Factors influencing grapevine vigour and the potential for control with partial rootzone drying

Dry, P.; Loveys, B.
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Artigo de Revista Científica
Publicado em //1998 Português
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Maintaining the most cost-effective balance between vegetative and reproductive growth is one of the most testing problems in modern viticulture. Grapevines which exhibit excessive vegetative vigour are likely to produce less fruit of reduced quality, and vines with inadequate vigour may be compromised in terms of their yield potential. The requirement for techniques to better manage excess vigour has become more acute in recent years with the increased use of irrigation, adoption of vigour-imparting rootstocks and the expansion of vineyards into cooler geographic regions. A number of strategies may be used to control vine vigour. Chemical growth regulators, although capable of reducing shoot vigour, have never received acceptance due to undesirable side effects and concerns over chemical residues. Devigorating rootstocks, likewise, may have the potential to control vigour but none are in wide commercial use. Restriction of the effective root volume, achieved through manipulation of planting densities, competition by cover crops, regulation of the soil volume wetted by drip irrigation or regulation of water availability can all achieve a degree of devigoration but often at the expense of fruit yield. Manipulation of vines through pruning and trellis design are probably the most commonly used methods for the control of shoot vigour. A high number of nodes retained at pruning combined with trellises which allow open canopies have proved successful. Advances in the understanding of the physiological factors influencing shoot growth and transpiration have allowed the development of novel irrigation methods for the control of vine vigour. These techniques exploit the fact that chemical signals originating in the roots are primarily responsible for the control of shoot growth and transpiration. Stimulation of the production of these signals through partial drying of the root system results in a significant reduction in shoot growth and water-use while maintaining crop yield and improving fruit quality. These new techniques...

The impact of agronomic manipulation of early vigour in wheat on growth and yield in South Australia

Sloane, D.; Gill, G.; McDonald, G.
Fonte: C S I R O Publishing Publicador: C S I R O Publishing
Tipo: Artigo de Revista Científica
Publicado em //2004 Português
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The initial growth of wheat crops can be manipulated either by agronomic means, such as by increasing inputs of seed and fertiliser, or by genetic improvement in early vigour. Cultivars of wheat with enhanced early vigour are still not commercially available and so a series of experiments was conducted to examine the impact of increasing initial dry matter production and leaf area index by increasing sowing and nitrogen (N) rates on grain yield. Increasing the sowing rate and amount of N fertiliser applied significantly increased early dry matter production and leaf area, with the largest responses occurring when sowing rate was increased. However, there was little effect on yield. The increases in dry matter production that occurred early in the season as a result of the additional inputs diminished as the season progressed. Yield responses to the additional inputs depended on the seasonal distribution of rainfall and in particular the rainfall received in August and September when grains per m² were being determined. Consequently, yield responses were affected more by changes in grain per m² than by changes in grain weight, and the benefits of the improvements in early vigour were only realised when moisture availability was high during the immediate pre-anthesis and early grain filling period of growth. High rainfall in August and September increased the responses in grains per m2 from increased sowing rate and N. When N was used to increase early growth...

Metabolic maturity and vigour in neonatal lambs, and subsequent impacts on thermoregulation and survival.

Plush, Kate Joanna
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2014 Português
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Lamb mortality in Australia averages approximately 20%, representing a major constraint to the profitability of sheep enterprises and compromised animal welfare. Most postpartum lamb loss occurs within the first three days of life and is largely caused by starvation, exposure to cold conditions and mismothering from the ewe. In this thesis we developed an over-arching hypothesis that differences in metabolic or physiological maturity exist between lambs, and that these differences relate to early postnatal vigour and survival, particularly during exposure to cold conditions. To test this hypothesis, behaviour associated with initial vigour was quantified in breeds of sheep which differ widely in neonatal survival and more specifically, risk of hypothermia. Pre-suckling blood samples were collected from these animals in order to identify potential markers of maturity chosen to represent the hypothalamic- pituitary- adrenal (HPA) axis, renal function and energy metabolism. A number of metabolite and endocrine shifts were identified in those that were quicker to reach the udder of the ewe and begin sucking. Namely, creatine, non-esterified fatty acids, leptin and ghrelin concentrations were elevated, implying these individuals may be better able to regulate energy mobilisation soon after birth. Lamb vigour was also strongly associated with rectal temperature at birth...

Influência da enxertia herbácea no vigor, produtividade e hábitos de frutificação da framboesa vermelha (Rubus idaeus); The influence of herbaceous grafting on vigour, productivity and friting habits of red raspberry (Rubus idaeus)

Santos, Maria Margarida Viegas Louro Oliveira
Fonte: Universidade Técnica de Lisboa Publicador: Universidade Técnica de Lisboa
Tipo: Dissertação de Mestrado
Publicado em //2009 Português
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Mestrado em Engenharia Agronómica - Hortofruticultura e Viticultura - Instituto Superior de Agronomia; Aiming to increase the productivity in red raspberry (Rubus idaeus L.) the effect of grafting in vigour, productivity and fruiting habits of several grafting combinations of raspberry cultivars was evaluated. Two trials comparing several herbaceous grafting combinations between different raspberry cultivars were established. The trials took place in spring and in summer, in protected culture, and cleft graft, "chip budding" and "pin grafting" were the grafting techniques used. The influence of these grafting techniques in vigour, productivity and fruiting habits was analysed. In the spring trial, the use of ‘Erika’ as a vigorous rootstock led to an increase in production of the graft 'Polka'. The cleft graft has proved not to be an efficient technique, with a survival rate in spring and in summer of 21.4% and 15.4%, respectively. In the summer’s trial, "chip budding” had the highest survival rate, 33.3%, whereas the "pin grafting" resulted in 19.1% of survived plants. The productivity of 'Polka' was not affected by the rootstock in this season. 'Glen Lyon' grafted plants flowered, regardless the rootstock used...

Combining ability effects for seed vigour traits related to emergence at low temperature in maize and grain sorghum

García de Yzaguirre, Álvaro; Lasa Dolhagaray, José Manuel; Álvarez Rodríguez, Ángel; Gracia Gimeno, María Pilar
Fonte: Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (España) Publicador: Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (España)
Tipo: Artículo Formato: 34923 bytes; application/pdf
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Available online at www.inia.es/sjar; [EN] Seed vigour traits correlated with field emergence speed in cool conditions and with acceptable coefficientsof variation were determined in hybrids and selfs from public inbred lines of maize and grain sorghum. Controlledtests showed less environmental variation than field measurements. In maize, there were significant parentaleffects in all traits except mean time to field emergence in cool conditions (FEI). Germination percentage after12 days at 10 oC, alone (LT) or related to a 25 oC control (LTC), and FEI, showed hybrid vigour. In LT, LTC andFEI, EZ18o2 and CM105 were the lines with the highest general combining ability (GCA) effects. No trait sho-wed significant mean heterosis in sorghum, where Ks22 was the line with highest GCAin LTC, LTand FEI. Maizegermination at low temperatures was better than that of sorghum, and its field emergence in cool conditions wasalso higher and faster.; [ES] Se han determinado ensayos de vigor de semilla con aceptables coeficientes de variación y correlacionadoscon la precocidad de emergencia en campo en condiciones frías, en híbridos y autofecundaciones de líneas purascruzadas según un diseño dialelo 6x6 en maíz y según un diseño North Carolina II 4x4 en sorgo para grano: por-centaje de germinación en soluciones salinas con tensiones osmóticas de -0...

Ensayos de vigor de nascencia: revisión bibliográfica

García de Yzaguirre, Álvaro; Lasa Dolhagaray, José Manuel
Fonte: CSIC - Estación Experimental de Aula Dei (EEAD) Publicador: CSIC - Estación Experimental de Aula Dei (EEAD)
Tipo: Libro Formato: 2601086 bytes; application/pdf
Português
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[EN] Seed vigour is a character of great interst, due to its high incidence on the stablshment of an optimum plant density necessary to reach a good productivity. Seed vigour has shown a great amount of intraspecific variability in many different crops, offering the possibility for the application of plant breeding programmes for its improvement. Direct estimation of seed vigour through field emergence is very affected by environmental conditions, leading to a lack of precision and repeteability of the test. In more than 40 species studied in this literature review, there are 40 to 50 laboratory test procedures for measuring seed an seedling vigour. Seed vigour tests are divided into direct and indirect tests. Indirect tests are subdivided into physiological, biochemical, and physical tests. The direct tests reviewed have been accelerated aging, controlled deterioration, soak test, osmotic stress, cold test, cool germination test, and brick grit. The physiological tests studied have been speed of germination, seed vigour classification, and seedling growth rate. As biochemical tests, we considered tetrazolium test, aleurone tetrazolium test, conductivity test, respiration, GADA, and ATP content. We include seed's size, weigth...

Evaluation of sunflower (Helianthus annuus, L.) genotypes differing in early vigour using a simulation model

Agüera, F.; Villalobos, F. J.; Orgaz Rosua, Francisco
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 26624 bytes; application/msword
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High early vigour (plant dry matter in the early development stages) in sunflower may be a desirable character under water-limited environments as it may contribute to higher transpiration efficiency and reduced soil evaporation. However a high early vigour causes a more rapid use of soil water, which may threaten crop water supply during seed filling. This is also influenced by the seasonal pattern of rainfall and genotype season length. The objective of this research was to simulate the performance of cultivars of sunflower differing in season length and early vigour under a Mediterranean climate. A simulation model of the sunflower crop, OILCROP-SUN, was modified and used to find the optimum combination of early vigour and season length of the genotypes for different environments. Field experiments were carried out during 1992, 1993 and 1994 in Cordoba, Spain (38°N). Sunflower populations with similar genetic background but with differences in early vigour were used to study the association of this trait with other characters and with the genetic parameters required to run the model. Changes in early vigour were simulated by modifying leaf growth rate in the model. The field experiments showed that high early vigour, as measured by stem volume 425°Cd after emergence...

Seed vigour tests for predicting field emergence of maize under severe conditions

García de Yzaguirre, Álvaro; Lasa Dolhagaray, José Manuel
Fonte: CSIC - Estación Experimental de Aula Dei (EEAD) Publicador: CSIC - Estación Experimental de Aula Dei (EEAD)
Tipo: Artículo Formato: 553754 bytes; application/pdf
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[EN] With 40 to 50 different seed vigour tests available, appropiate procedures for choosing the best single test or combination the best predictors of seedling emergence of maize (Zea Mays L.) under severe conditions. Thirteen vigour tests and various field emergence trials were performed on six inbred lines and two commercial hybrids. The best single predictors of field emergence were identified by calculating simple correlation coefficients. The calculation of the geometric mean of the results of several vigour tests is a method for utilising multiple tests that are correlated. Taking all this into account, the tests which best predict seedling emergence were germination percentage in a saline solution at an osmotic potential (O.P) of -2 bars, germination percentage at 10º related to the control, and germination percentage in a saline solution at an O.P. of -6 bars.; [ES] Con 40 a 50 métodos diferentes disponibles para el testado del vigor de nascencia, son necesarios procedimientos para elegir el mejor método único o combinación de métodos. El objetivo de este estudio era seleccionar los mejores estimadores de emergencia de maíz (Zea Mays L.) en condiciones difíciles. Fueron efectuadas trece pruebas de vigor y varios ensayos de campo sobre seis líneas puras y dos híbridos comerciales. Fueron identificados los mejores estimadores únicos calculando simples coeficientes de correlación. El cálculo de la media geométrica de algunos tests de vigor es un procedimiento para utilizar métodos múltiples que estén correlacionados. Teniendo en cuenta todo esto los métodos que predicen mejor la nascencia en campo fueron el porcentaje de germinación en solución salina a un potencial osmótico (P.O.) de -2 bares...

Increasing plant vigour and tomato fruit yield under salinity by inducing plant adaptation at the earliest seedling stage

Parra, Margarita; Albacete, Alfonso; Martínez-Andújar, Cristina; Pérez-Alfocea, Francisco
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 579917 bytes; image/jpeg
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The authors dedicate this paper to the memory of the late Professors Manuel Caro (CEBAS-CSIC) and Gilles Guerrier (Université d’Orléans, France).; In order to reduce the negative effect of salinity on fruit yield, 5-day-old tomato seedlings (Lycopersicon esculentum) were haloconditioned by complete immersion in osmotic/saline solutions composed of PEG (−0.5, −0.75, −1 MPa), with or without 10 mM NaCl, for 1, 3, 5 and 8 days. Under moderate salinity (7.5 dS m−1), the pre-adapted plants produced 23% more shoot biomass and fruit yield than the non-adapted plants. In addition to the induced vigour, the improved tolerance in most pre-treatments was related to lower Na+ and Cl− concentrations in the leaves and increases in leaf K+ contents and K+/Na+ ratio, but the contrary was also observed. Overall, the most effective haloconditioning treatment seems to be the application of −0.75 MPa for 3 days. During the experiment in greenhouse, some vigorous haloconditioned plants were propagated through adventitious apex culture and evaluated under salinity in a short-term experiment. The results suggested that the induced salt tolerance was not horizontally transmitted, indicating that (i) the individuals chosen were not genetically more vigorous...

Teste de lixiviação de potássio para avaliação do vigor de sementes de soja [Glycine max (L.)Merril]; Potassium leaching test for the evaluation of soybean seed vigour

Dias, D.C.F.S.; Marcos F, J.; Carmelo, Q.A.C.
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/12/1995 Português
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O presente trabalho teve como objetivo principal investigar a possibilidade de se obter indicações rápidas sobre a qualidade fisiológica de sementes de soja através do teste de lixiviação de potássio, cuja eficiência foi avaliada comparativamente as informações fornecidas por outros métodos considerados adequados para a determinação do vigor. Para tanto, utilizou-se quatro lotes de sementes de soja dos cultivares IAC-8 e IAC-15 que foram submetidos aos testes de germinação, primeira contagem de germinação, envelhecimento artificial, condutividade elétrica e determinação do grau de umidade. Além destes foram conduzidos estudos de lixiviação de potássio utilizando-se amostras de sementes não danificadas e de sementes fisicamente puras. A quantidade de potássio lixiviado foi avaliada em fotômetro de chama após 60, 90, 120 e 150 minutos de embebição a 30ºC. As avaliações feitas aos 60, 90 e 120 minutos mostraram-se adequadas para a identificação de lotes com diferentes níveis de vigor, constituindo-se em um método simples e rápido para a avaliação da qualidade fisiológica das sementes.; This work was performed to investigate the possibilities of providing rapid indications on the physiological quality of seeds through the potassium leaching test. Four lots of soybean (Glycine max (L.) Merrill) seeds...

Effects of maize seed treated with zinc and boron sources on germination and vigour; Efeito do tratamento com fontes de zinco e boro na germinação e vigor de sementes de milho

Ribeiro, N.D.; Santos, O.S. dos; Menezes, N.L. de
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/12/1994 Português
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The experiment was carried during the period of march 1992 to november 1992, to study the effects of maize seed treatment with zinc, boron and pesticides, on the germination and vigour during storage. The experimental design was a complete randomized 3x2x6 fatorial with four replicátions. The treatments were three storage periods (zero, four and eight month), pesticides treatments with or without, and six sources of zinc and boron (control, Zn-Biocrop, B-Biocrop, Organic-B, Zn-Biocrop -I- B-Biocrop and Zn-Biocrop + Organic-B), in the dose 2.50g of the Zn and 0.l5g of the B/kg of seeds. The results show that Zn-Biocrop maintain high germination and vigour for eight month of storage. The boron treatment (B-Biocrop and Organic-B) showed a low germination and vigour.; Foi conduzido um experimento no Departamento de Fitotecnia da Universidade Federal de Santa Maria, RS, no período de março a novembro de 1992, com o objetivo de verificar o efeito da aplicação de fontes de zinco e boro em sementes de milho tratadas ou não com defensivos agrícolas. Adotou-se o esquema fatorial 3x2x6, em delineamento inteiramente casualizado, com quatro repetições. Os tratamentos constaram de avaliações em três épocas (logo após o tratamento, quatro e oito meses depois)...