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Efeito do ácido giberélico no metabolismo amido-sacarose durante o amadurecimento da banana (Musa acuminata var. Nanicão); Effects of gibberellic acid on metabolism starch-sucrose during banana ripening (Musa acuminta var. Nanicão)

Rossetto, Maria Rosecler Miranda
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 01/06/2001 Português
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O amadurecimento é uma etapa exclusiva do estágio de desenvolvimento dos frutos, que envolve uma série de transformações metabólicas a partir de diferentes fontes de energia. Ele é mediado por um dinâmico complexo enzimático, resultando em síntese/degradação e conversão de compostos que tornarão o fruto aceitável para o consumo. Dependendo do tipo de fruto, essa fonte de energia pode ser na forma de ácidos orgânicos, sacarose vinda da própria planta e na forma de amido. A banana (Musa acuminata) é uma fruta de comportamento climatérico que utiliza como principal fonte de carbono o amido, que é reduzido durante o climatério de teores que variam de 12 a 20% a menos de 1 %. Concomitante à esta degradação, o teor de sacarose pode atingir até 15%, dependendo da cultivar. O ácido giberélico (GA3) é um fitohormônio da família das giberelinas que tem sido muito estudado em cereais por aumentar a transcrição gênica das α-amilase. Em frutos, ele é responsável por manter a textura firme e o teor de sólidos solúveis, e atrasar o amadurecimento. Ao estudar a influência do GA3 no metabolismo amido-sacarose em fatias de banana, observou-se neste trabalho que o fitohormônio não alterou o pico respiratório nem a síntese de etileno. Entretanto...

Action of gibberellic acid (GA3) on dormancy and activity of alpha-amylase in rice seeds

Vieira,Antônio Rodrigues; Vieira,Maria das Graças Guimarães Carvalho; Fraga,Antônio C.; Oliveira,João Almir; Santos,Custódio D. dos
Fonte: Associação Brasileira de Tecnologia de Sementes Publicador: Associação Brasileira de Tecnologia de Sementes
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2002 Português
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To evaluate the effectiveness of gibberellic acid (GA3) in breaking rice seed dormancy and the use of alpha-amylase enzyme activity as an indicator of the dormancy level, seed from the intensively dormant irrigated cultivar Urucuia were used. The seeds were submitted to a pre-drying process in a forced air circulation chamber under 40ºC during 7 days and submersed in 30 mL of GA3 solution under 0, 10, 30 and 60 mg/L H2O concentrations, during 2, 24 and 36 hours. After the treatments, the alpha-amylase activity was determined by using the polyacrilamide electrophoresis and spectrophotometry. At the same time, the germination test was made. The results indicated a gain in germination and in alpha-amylase activity in higher concentrations and soaking time of seeds in GA3. These observations support the conclusion that soaking seed in 60 mg GA3/L during 36 hours can be used as a quick and efficient treatment in breaking rice seed dormancy and is equivalent to the forced air circulation chamber at 40ºC during 7 days. The alpha-amylase enzyme activity proved to be as an efficient marker of the seeds dormancy level.

Determination of gibberellic acid by sequential injection analysis using a potentiometric detector based on Mn(III)-porphyrin with improved characteristics

Santos,Emília M. G.; Couto,Cristina M. C. M.; Araújo,Alberto N.; Montenegro,M. Conceição B. S. M.; Reis,Boaventura F.
Fonte: Sociedade Brasileira de Química Publicador: Sociedade Brasileira de Química
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2004 Português
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This work describes the determination of gibberellic acid in growth promoters formulations used in agriculture by sequential injection analysis and potentiometric detection. The potentiometric detectors with improved characteristics used a PVC membrane prepared with Mn(III)tetraphenylporphyrin-Cl as electroactive specie. Different membranes formulated with several ionic additives were compared in order to select the most suitable one concerning slope, response time, reproducibility and selectivity. A membrane containing 6 wt% of manganese tetraphenylporphyrin-Cl [(Mn(TPP)Cl], 27 wt% of PVC, 66 wt% of dibutylphthalate (DBP), as mediator solvent, and 1 wt% of sodium tetraphenylborate, as anionic additive, was chosen for analytical applications. When coupled to a SIA system the tubular electrode presented a linear range between 5×10-4 mol L-1 and 8×10-3 mol L-1, a slope of -64.5 ± 1.6 mV/dec and lower potentiometric selectivity coefficients (log Kpot) than those obtained with the conventional electrodes. Standard deviation of 0.01 and 0.4 (n= 4) and a sampling rate of 30 samples/hour were obtained in the analysis of real samples.

Relationship between gibberellic acid and growth parameters in developing seed and pod of pigeon pea

Chudasama,Rita S.; Thaker,Vrinda S.
Fonte: Brazilian Journal of Plant Physiology Publicador: Brazilian Journal of Plant Physiology
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2007 Português
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Changes in endogenous gibberellic acid (GA) levels were determined in developing seeds and pods of pigeon pea (Cajanus cajan). Antibodies against GA3 were raised in rabbits and indirect ELISA developed to estimate GA level. Two varieties, black seeded variety (V1) and B.D.N2 (V2), were selected on the basis of their seed index value. The pod length and number of seeds per pod were significantly different for the two varieties. Dry weight, water content (WC), rate of water accumulation, rate of dry matter accumulation (DMA), and GA content in pod and seed were all larger in V1 than in V2. In both varieties, higher GA content was observed during cell elongation and DMA phases, respective to their varietal differences in growth traits. Relationships between WC and rate of DMA, and WC and GA differed significantly between the two varieties. The results suggest a role of GA and WC in sink-size development in both varieties studied.

Effect of auxin and gibberellic acid on growth and yield components of linseed (Linum usitatissimum L.)

Rastogi,Anu; Siddiqui,Ameena; Mishra,Brij K; Srivastava,Mrinalini; Pandey,Rawli; Misra,Pratibha; Singh,Munna; Shukla,Sudhir
Fonte: Crop Breeding and Applied Biotechnology Publicador: Crop Breeding and Applied Biotechnology
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/07/2013 Português
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The commercial importance of linseed (Linum usitatissimum L.) has attracted breeders to increase its seed yield using various breeding approaches. Plant growth regulators (PGRs) have a significant role in enhancing yield and its related traits in linseed. In the present study, two plant growth hormones, auxin and gibberellic acid, were applied individually, as well as in combinations, in order to study their effect on yield and its components in "Neelam", which is a high yielding variety of linseed. A comparative study was done under pot and field condition. A combined dose of auxin (1.0 mg L-1) and gibberellin (200 mg L-1) is recommended for the enhancement of seed yield, whereas a 0.5 mg L-1 dose of auxin is recommended for the enhancement of vegetative growth. It was concluded that the plant growth regulators can be successfully employed to enhance the yield in this economically important oil seed crop.

Gibberellic Acid-enhanced Release of β-1,3-Glucanase from Barley Aleurone Cells 1

Jones, Russell L.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /03/1971 Português
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A β-1, 3-glucanase of barley (Hordeum vulgare) aleurone cells accumulates when half-seeds are imbibed on water, and accumulation continues when the aleurone layers are incubated in buffer solution. The release of the enzyme is a gibberellic acid-dependent process, however. Although gibberellic acid stimulates glucanase release, it does not markedly affect the total amount of glucanase obtained from these cells when compared with water controls. β-1, 3-Glucanase release from aleurone cells is a function of gibberellic acid concentration and commences after a 4-hour lag period. Processes occurring during this lag period are also dependent upon gibberellic acid concentration. Removal of gibberellic acid from the incubation medium at the end of the lag period, however, does not affect subsequent release of glucanase. The release of glucanase from aleurone cells is an active process with a Q10 greater than 3. Inhibitors of respiration and protein and RNA synthesis effectively inhibit the formation and release of glucanase. It is concluded that gibberellic acid functions primarily to enhance glucanase release rather than its formation.

Meristematic Activity during Adventitious Root Primordium Development: Influences of Endogenous Auxin and Applied Gibberellic Acid

Haissig, Bruce E.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /06/1972 Português
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Intact brittle willows (Salix fragilis L.) were treated so that developing adventitious root primordia in the stems would be subjected to elevated gibberellic acid or reduced endogenous auxin levels. Observations were made of primordia that were initiated during the experiments and of primordia that were established before the experiments began. The results indicated that as primordia became older and contained more cells, auxin basipetally transported in the stem seemed to be of less importance in determining cell number per primordium. Thus, established primordia depended upon this auxin to a lesser extent than primordia which were being initiated. These observations were explained on the basis of differential contributions during primordium development of cell division in the cambium of the stem and in the primordia themselves. As opposed to the effects of reduced auxin levels, applied gibberellic acid reduced the cell number per primordium most in established primordia. Initiating primordia were least affected by gibberellic acid treatment. Gibberellic acid treatment seemed mainly to reduce intraprimordium cell division, on which continued development of established primordia most depends. Seemingly, at least in brittle willow...

A Correlation between a Ribonucleic Acid Fraction Selectively Labeled in the Presence of Gibberellic Acid and Amylase Synthesis in Barley Aleurone Layers

Zwar, J. A.; Jacobsen, John V.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /06/1972 Português
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The effects of gibberellic acid on the incorporation of radio-active uridine and adenosine into RNA of barley aleurone layers were investigated using a double labeling method combined with acrylamide gel electrophoresis. After 16 hours of incubation, gibberellic acid stimulated the incorporation of label into all species of RNA, but the effects were very small (0-10%) for ribosomal and transfer RNA and comparatively large (up to 300%) for RNA sedimenting between 5S and 14S. This result was obtained for both isolated aleurone layers and for layers still attached to the endosperm. A similar but less marked pattern occurred in layers incubated for 8 hours, but the effect was not observed after 4 hours. The gibberellic acid-enhanced RNA labeling was not due to micro-organisms. The following evidence was obtained for an association between the gibberellic acid-enhanced RNA synthesis and α-amylase synthesis: (a) synthesis of α-amylase took place in parallel with incorporation of label into gibberellic acid-RNA; (b) actinomycin D inhibited amylase synthesis and gibberellic acid-RNA by similar percentages; (c) 5-fluorouracil halved incorporation of label into ribosomal RNA but had no effect on amylase synthesis and gibberellic acid-RNA; and (d) abscisic acid had little effect on synthesis of RNA in the absence of gibberellic acid...

On the Nature of the Physiological Responses of Avena Stem Segments to Gibberellic Acid Treatment

Montague, Michael J.; Ikuma, Hiroshi; Kaufman, Peter B.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /06/1973 Português
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Gibberellic acid was found to cause elongation in Avena sativa (oat) stem segments whether it was applied continuously or as a short pulse. The shorter the pulse time became, the higher was the gibberellic acid concentration needed to cause elongation; the segmental growth apparently depends upon the amount of gibberellic acid taken up by the segments. Avena segments showed a decreased growth response to gibberellic acid if the treatments were initiated at increasingly later times after excision from the plant. This decreased responsiveness to gibberellic acid was inhibited by low temperature (0-4 C), but accelerated by anaerobiosis. On the other hand, growth stimulation by a gibberellic acid pulse at the start of incubation was not altered by cold treatment but was nullified by a nitrogen atmosphere. Both the readiness of the segments for growth stimulation by gibberellic acid and its action in promoting growth clearly involve temperature-dependent, aerobic metabolism.

Effects of Gibberellic Acid and Sucrose on the Growth of Oat (Avena) Stem Segments

Adams, Paul A.; Kaufman, Peter B.; Ikuma, Hiroshi
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /06/1973 Português
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Gibberellic acid induced growth in Avena (oat) stem segments within 35 minutes after hormone application. The total elongation elicited by gibberellic acid was greater than 15 times the control growth. The sensitivity of the segments to low concentrations of gibberellic acid (1 pmole) and the specificity of the segments to the gibberellin class of hormones suggest that oat stem segments would be a valuable tool for gibberellin bioassays. Both gibberellic acid-induced growth and control growth are temperature-dependent and showed a Q10 of two or greater. Although the most apparent effect of gibberellic acid was to promote the uptake of water into the internode, the hormone also promoted transport of endogenous substrate and the uptake of exogenous substrate into the growing region. The growth promotion was accomplished without an apparent increase in osmotic pressure.

Regulation of Invertase Levels in Avena Stem Segments by Gibberellic Acid, Sucrose, Glucose, and Fructose 1

Kaufman, Peter B.; Ghosheh, Najati S.; Lacroix, J. Donald; Soni, Sarvjit L.; Ikuma, Hiroshi
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /09/1973 Português
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Gibberellic acid and sucrose play significant roles in the increases in invertase and growth in Avena stem segments. About 80% of invertase is readily solubilized, whereas the rest is in the cell wall fraction. The levels of both types of invertase change in a similar manner in the response to gibberellic acid and sucrose treatment. The work described here was carried out with only the soluble enzyme. In response to a treatment, the level of invertase activity typically follows a pattern of increase followed by decrease; the increase in activity is approximately correlated with the active growth phase, whereas the decrease in activity is initiated when growth of the segments slows. A continuous supply of gibberellic acid retards the decline of enzyme activity. When gibberellic acid was pulsed to the segments treated with or without sucrose, the level of invertase activity increased at least twice as high in the presence of sucrose as in its absence, but the lag period is longer with sucrose present. Cycloheximide treatments effectively abolish the gibberellic acid-promoted growth, and the level of enzyme activity drops rapidly. Decay of invertase activity in response to cycloheximide treatment occurs regardless of gibberellic acid or sucrose treatment or both...

Gibberellic Acid and Ion Release from Barley Aleurone Tissue: Evidence for Hormone-dependent Ion Transport Capacity

Jones, Russell L.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /10/1973 Português
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The release of potassium, magnesium, and phosphate ions from aleurone cells of barley (Hordeum vulgare L. cv. Himalaya) is a gibberellic acid-dependent process. The release of these ions is preceded by a lag period of 6 to 8 hours after gibberellic acid addition. The effect of gibberellic acid on the release of ions is not mediated through an effect on ion solubilization. Thus, gibberellic acid does not apreciably affect the sum of extracted and released ions relative to controls. Rather, the effect of the hormone is on the release process itself. Inhibitors of oxidative phosphorylation when added with gibberellic acid or at times up to 6 hours after gibberellic acid inhibition release. When these inhibitors are added after ion release has begun, however, rapid efflux of ions occurs. These results suggest a strong correlation between energy levels and ion transport capacity. Inhibitors of RNA and protein synthesis also inhibit gibberellic acid-stimulated ion release. Evidence suggests that RNA and protein synthesis are required to establish and maintain ion release capacity of aleurone cells.

Interactions between Gibberellic Acid, Ethylene, and Abscisic Acid in Control of Amylase Synthesis in Barley Aleurone Layers

Jacobsen, John V.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /01/1973 Português
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Gibberellic acid-induced α-amylase synthesis in barley (Hordeum vulgare L.) aleurone layers was inhibited by abscisic acid, and the inhibition was partly removed by additional gibberellic acid alone and by ethylene alone. Together additional gibberellic acid and ethylene almost eliminated abscisic acid inhibition of amylase synthesis. Time course studies of these phenomena showed that the effect of abscisic acid, ethylene, and varying concentrations of gibberellic acid on the course of amylase synthesis were either to speed up or slow down the whole process and not to affect the lag phase or the linear phase separately. The data are discussed in relation to previous studies of abscisic acid-gibberellic acid interaction.

Genetic Control of Endosperm Amylase Activity and Gibberellic Acid Responses in Standard-Height and Short-Statured Wheats

Fick, Gerhardt N.; Qualset, Calvin O.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /03/1975 Português
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In contrast to standard-height wheat genotypes, short-statured wheats having major genes for dwarfness do not show increased seedling growth after treatment with gibberellic acid. Endogenous gibberellic acid induces synthesis of amylase in the endosperm of germinating seeds, but the amount of amylase synthesized is greatly increased by exogenous gibberellic acid treatment in standard-height and in short-statured wheats that have dwarfing genes from the variety “Norin 10.” “D6899,” which has the “Tom Thumb” gene for height reduction, had about one-fourth of the amylase activity of standard-height and Norin 10-derived, short-statured wheats. This genotype showed little or no increased amylase activity after gibberellic acid treatment. Genetic analyses showed that the amount of amylase synthesized was controlled by a single gene and was dependent on the number of copies of the structural gene present in the endosperm. Dwarfism in wheat may be related to a blockage in gibberellic acid utilization because other workers have found that the amount of endogenous amylase synthesized in Norin 10-derived, short-statured wheats is not growth-limiting, but it is not known if low amylase synthesis is related to dwarfism in the Tom Thumb derivative. No recombinants were recovered in a small population...

Actions of Gibberellic Acid and Phytochrome on the Germination of Grand Rapids Lettuce Seeds 1

Vidaver, William; Hsiao, A. I-Hsiung
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /02/1974 Português
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Red light and gibberellic acid were about equally effective in promoting germination of Grand Rapids lettuce (Lactuca sativa L.) seeds. With initial far red light treatment more than 80% remained dormant in subsequent dark storage. After 2 days of dark storage, red light effectively promoted germination, while gibberellic acid action was weak. With between 2 and 10 days of dark storage, gibberellic acid had little effect, while promotion by red light decreased slowly and finally disappeared. After 10 days of dark storage, both gibberellic acid and red light were required for germination. The dark storage treatment interferes with phytochrome-independent germination processes and cannot be overcome by added gibberellic acid. However, storage may also decrease the effectiveness of endogenous gibberellins. Phytochrome-dependent germination seems to require only low levels of endogenous gibberellin activity or the addition of gibberellic acid. Gibberellins and red light appear to act on germination by regulation of sequential sites of a branched-looped pathway.

Effect of Gibberellic Acid on Ipomoea Batatas Regeneration From Meristem Culture.

DAGNINO, D.S.; CARELLI, M.L.D.; ARRABAL, R.F.; ESQUIBEL, M.A.
Fonte: Pesquisa Agropecuaria Brasileira, Brasilia, v.26, n.2, p.259-262, fev.1991 Publicador: Pesquisa Agropecuaria Brasileira, Brasilia, v.26, n.2, p.259-262, fev.1991
Tipo: Artigo em periódico indexado (ALICE)
Português
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The elongation of the explants is one of the crucial aspects in developing protocols for regeneration of sweet potato from meristem culture. In order to promote elongation and accelerate explant development, gibberellic acid (GA3) was added to the culture medium. Experimental results were strongly influenced by the cultivars employed. The effect of GA3 was to promote multiple shoot growth and elongation of cv. Mãe de Família; on the other hand, the addition of GA3 had no effect on explant growth in cv. Coração Alado.; 1991

Effects of temperature and gibberellic acid on phospholipid composition of Avena sativa stem segments

Jusaitis, M.; Paleg, L.; Aspinall, D.
Fonte: Pergamon Press Publicador: Pergamon Press
Tipo: Artigo de Revista Científica
Publicado em //1981 Português
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Stem segments taken from Avena sativa plants grown at 10°, 20° or 30° varied in their phospholipid composition depending on the growth temperature; as temperature was lowered, there was a shift towards a greater proportion of unsaturated fatty acids. A significant increase was observed in the concentration of linolenic acid (18:3) as growth temperature was lowered. Although prolonged treatment of oat plants with GA3 produced marked changes in phospholipid composition of stem segments, these changes did not always accompany the GA3-induced growth response of segments. Treatment of stem segments with GA3 for only 20 hr produced a significant growth response with little or no effect on phospholipid composition over this time. The data support the hypothesis that GA3-induced growth in Avena stem segments can occur without a concomitant change in phospholipid composition.; Manfred Jusaitis, Leslie G. Paleg, Donald Aspinall

Efeito do anelamento e de doses de ácido giberélico na frutificação das uvas 'Niagara Rosada' e 'Vênus' nas regiões noroeste e da alta paulista do Estado de São Paulo.; Effect of girdling and gibberellic acid on the fruit set of 'Niagara Rosada' and 'Venus' grapevines growing in the northwest area of São Paulo state.

Cáto, Stella Consorte
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 29/05/2002 Português
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O presente trabalho foi desenvolvido com o objetivo de avaliar o efeito do ácido giberélico em doses crescentes, isoladamente ou em conjunto com o anelamento de ramos e/ou com o desponte de cachos sobre as características dos cachos, bagos e engaços das cultivares de uvas de mesa Niagara Rosada e Vênus. Foram realizados dois experimentos para cada cultivar nas regiões noroeste e da alta paulista do Estado de São Paulo, e os delineamentos estatísticos utilizados foram em blocos ao acaso, com cinco repetições sendo quatorze e dezoito tratamentos para 'Niagara Rosada' e vinte e oito tratamentos para cada experimento com 'Vênus'. Para todos os experimentos, o ácido giberélico nas doses de 0; 10; 22,5; 35; 47,5; 60 e 72,5ppm, fo i aplicado quinze dias após o pleno florescimento, através da imersão total dos cachos, com exceção de um experimento com 'Niagara Rosada', no qual foi acrescido mais duas doses de 85 e 97,5ppm. O anelamento nos ramos produtivos foi realizado também nesta mesma época. No primeiro experimento com 'Niagara Rosada' detectou-se que não houve influência do anelamento de ramos sobre a massa e o tamanho médio dos bagos. Também, a dose de 35ppm de ácido giberélico sendo aplicada isoladamente originou incrementos na massa e tamanho médio dos cachos e bagos. Esta mesma dose quando aplicada conjuntamente com o anelamento de ramos proporcionou incrementos no teor de sólidos solúveis totais do mosto. No segundo experimento com 'Niagara Rosada'...

A new alternative to produce gibberellic acid by solid state fermentation

Rodrigues,Cristine; Vandenberghe,Luciana Porto de Souza; Teodoro,Juliana; Oss,Juliana Fraron; Pandey,Ashok; Soccol,Carlos Ricardo
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2009 Português
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Gibberellic acid (GA3) is an important hormone, which controls plant's growth and development. Solid State Fermentation (SSF) allows the use of agro-industrial residues reducing the production costs. The screening of strains (four of Gibberella fujikuoroi and one of Fusarium moniliforme) and substrates (citric pulp, soy bran, sugarcane bagasse, soy husk, cassava bagasse and coffee husk) and inoculum preparation study were conducted in order to evaluate the best conditions to produce GA3 by SSF. Fermentation assays were carried out in erlenmeyers flasks at 29°C, with initial moisture of 75-80%. Different medium for inoculum production were tested in relation to cells viability and GA3 production by SSF. F. moniliforme LPB 03 and citric pulp were chosen for GA3 production. The best medium for inoculum production was citric pulp extract supplemented with sucrose. GA3 production by SSF reached 5.9 g /kg of dry CP after 3 days of fermentation.

Gibberellic acid contribution to tomato fruit size doi: 10.5007/2175-7925.2010v23n4p25; Contribuição do ácido giberélico no tamanho de frutos do tomateiro

Ayub, Ricardo Antonio; Universidade Estadual de Ponta Grossa; Rezende, Bráulio Luciano Alves; Instituto Federal do Espírito Santo (IFES)
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 01/01/2010 Português
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With the aim of assessing the behavior of tomato fruitssubjected to increasing concentrations of gibberellic acid (GA3), research was carried out in the municipalityof Irati, Paraná State, Brazil, within a commercial area of tomato crops, cultivar Fanny, in September under thecrossing fence system with a single branch per plant. The adopted treatments were as follows: 0, 30, 60, 90,and 120ppm of GA3, applied whenever the diameter of the fi rst fruits of the second clusters reached roughly 10mm. At harvest when the fruits had achieved 30 to 50% of reddish color, the fresh mass, length, and longitudinaland transversal diameters were measured. The application of 120ppm of GA3 provided maximum fresh massand dimensions.; http://dx.doi.org/10.5007/2175-7925.2010v23n4p25Com o objetivo de avaliar o comportamento de frutos de tomateiro submetidos a concentrações crescentes de ácido giberélico (GA3), implantou-se um ensaio no município de Irati-PR, em uma área comercial de tomate cv. Fanny, em setembro e conduzido em sistema de cerca cruzada com uma haste por planta. Os tratamentos utilizados foram: 0, 30, 60, 90 e 120ppm de GA3, aplicados quando o diâmetro dos primeiros frutos do segundo cacho atingiu aproximadamente 10mm. Na colheita...