177 resultados para GROWTH REGULATORS
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Improvement on yield potential of plants by crop management is the main research challenge due to the growing of food demand worldwide. The objective of this work was to study physiological and morphological traits and its relationship with yield components and yield of wheat as affected by sowing densities and plant growth regulators. The experimental design was a split-plot design with four replications. The plots were consisted by four sowing densities ( 30, 50 70 and 90 plants m(-1)) and the subplots were consisted by plant growth regulators [control, (IBA+GA+KT), Trinexapac-Ethyl e (IBA+GA+KT) + Trinexapac-Ethyl]. Dry matter accumulation, plant height, source-sink distance, gas exchange and yield were determined. Trinexapac-Ethyl application resulted in decreasing of plant height, source-sink distance and flag leaf length; however, the grain yield was not affected. The number of plants per unit area affected dry matter accumulation. Higher dry matter accumulation showed direct relationship with yield and yield components in lower plant densities.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Pós-graduação em Agronomia (Produção Vegetal) - FCAV
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Pós-graduação em Agronomia (Horticultura) - FCA
Tecnologias para produção de mudas de espinheira-santa: propagação vegetativa por estacas caulinares
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Pós-graduação em Agronomia (Horticultura) - FCA
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The tangerine 'Sunki' are highly relevant for the Brazilian citrus industry by presenting important traits for genetic improvement and to be considered a great portaenxento. In this context, the objective of the present work to study the characterization of the fruits of citrus rootstock 'Sunki', depending on the position on the plan and also the germination of their seeds. The physical characteristics evaluated were fruit weight, longitudinal and equatorial diameters of the fruit longitudinal diameter / equatorial diameter, number of buds per fruit, weight of buds and bark and number of viable seeds per fruit. As for the chemical characterization was evaluated titratable, acidity, soluble solid, "Ratio", pH and vitamin C. For the evaluation of these variables, the fruits were obtained from the northeast, southwest, northwest and southeast quadrants. Regarding the evaluation of seed germination, different doses of gibberellic acid and Stimulate were used. The seeds extracted from ripe fruit, washed, dried in the shade and stored in BOD. Immediately after, they were treated for 24 hours with plant growth regulators. After soaking, the seeds were placed in a germinator in germitest paper. After initiation of the germination process, the evaluations were performed daily until the thirty- fourth day. Fruits of 'Sunki'mandarin with uneven as the fruit position within the canopy, the use of gibberellic acid and growth promoter is promising for commercial use on seed germination of this rootstock.
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This work had the purpose to study the physiological effects of pyraclostrobin, boscalid, plant growth regulators and plant extract on the accumulation of carbohydrates during the development of tomato plants (Solanum lycopersicum L.), hybrid Giuliana, in protected environment conditions. The treatments were: T1- control; T2- pyraclostrobin 0.2 g L-1; T3- boscalid 0.075 g L-1, T4- pyraclostrobin 0.2 g L-1 + boscalid 0.075 g L-1, T5- IBA + GA(3) + kinetin 375 mg L-1, T6- GA(4+7) + benzylaminopurine 100 mg L-1 and T7- plant extract 100 mg L-1. The carbohydrate accumulation curve was accomplished with 5 samples, at 20-day intervals between evaluations, the 1st evaluation being carried out at 30 days after transplantation, on the day of the first treatment application. At each sampling the plants were separated in stem, leaves and fruits, of which the contents of total soluble sugars, reducing sugars and saccharose were evaluated. The effects of the treatments on chlorophyll content and gas exchanges were also evaluated. The experimental design was completely randomized, with 4 repetitions and 6 destructive evaluations during the development, with 1 plant per experimental unit for each sampling. The pyraclostrobin and boscalid applied in isolation and/or combined favor the increase of carbohydrates in leaves, stems and fruits of tomato hybrid Giuliana.
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Effects of pulsing with different concentrations of gibberellin plus benzyladenine (GA(4+7) + BA), a proprietary mixture of GA(4+7) plus BA in a commercial floral preservative (GA(4+7) + BA + preservative), or a propriety mixture of sugar plus acidifier developed for bulbous flowers (floral bulb preservative) were studied on postharvest performance and quality of cut lily (Lilium hybrids) and gladiolus ( Gladiolus hybrids) flowers. Pulsing of cut stems of lily with GA(4+7) + BA at 5 or 2 mL.L-1 GA(4+7) + BA + preservative for 20 hours at 3 +/- 1 degrees C extended the vase life and controlled leaf chlorosis of 'Cobra'oriental lily and 'Cappuccino'and Pot Corn'asiatic lily. Cut 'Orange Art'asiatic lily performed best when pulsed with GA(4+7) + BA at 10 mg.L-1. For cut gladiolus, pulsing with GA(4+7) + BA at 10 mg.L-1 extended the vase life of 'Alice', 'Mammoth', and 'Passion', while 'Scarlet'had the longest vase life when pulsed with 5 mg.L-1 GA(4+7) + BA. GA(4+7) + BA + preservative also extended the vase life and controlled leaf chlorosis, but the floral bulb preservative had no effect on vase life extension or preventing leaf chlorosis of lilies. Gladiolus cultivars had no or minor leaf chlorosis during vase period. Overall, overnight pulsing with GA(4+7) + BA + or GA(4+7) + BA + preservative extended the vase life and prevented leaf chlorosis
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O objetivo deste trabalho foi estudar os efeitos do ácido giberélico (GA3), do ethephon e da interação de ambos os reguladores vegetais no processo germinativo de sementes de atemoia (Annona cherimola Mill. x A. squamosa L. ), cultivar 'Gefner'. Empregou-se delineamento experimental inteiramente casualizado, em esquema fatorial 5², com os tratamentos constituídos pela combinação de cinco concentrações de GA3 (ácido giberélico) e cinco concentrações de ethephon, resultando em 25 tratamentos, com quatro repetições de 25 sementes por parcela. As concentrações de GA3 empregadas foram: 0; 250; 500; 750 e 1.000 mg L-1 i.a.e de ethephon: 0; 25; 50; 75 e 100 mg L-1 i.a.. Os tratamentos com os reguladores vegetais foram aplicados na semente por imersão das mesmas nas soluções de GA3 e ethephon por período de 36 horas. As sementes foram semeadas em rolo de papel germitest e levadas à câmara de germinação onde permaneceram no escuro, com temperatura alternada entre 20ºC por 8 horas e 30ºC por 16 horas. As variáveis avaliadas foram: percentagem, tempo e índice de velocidade de germinação, percentagem de plântulas normais e percentagem de sementes dormentes. Existe interação da ação dos reguladores vegetais estudados no processo germinativo de sementes de atemoia, o que permite concluir que a percentagem de germinação de sementes de atemoia (Annona cherimola Mill. x A. squamosa L. ) cv 'Gefner' é aumentada com o emprego de 778 mg L-1 de GA3, enquanto a associação entre elevadas concentrações de GA3 e 75 a 100 mg L-1 de ethephon incrementam o índice de velocidade de germinação e a percentagem de plântulas normais.
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O objetivo deste trabalho foi avaliar o efeito do uso dos reguladores vegetais, ácido giberélico e tidiazuron, no tamanho de bagas da cultivar BRS Clara em Região Tropical. Os experimentos foram conduzidos em 2006 e 2007, na Estação Experimental de Viticultura Tropical, em Jales-SP, região noroeste do Estado de São Paulo, em plantas da cv. BRS Clara. Foram testadas diferentes concentrações de GA3 aplicadas isoladamente, combinadas com Crop Set ou tidiazuron, em aplicações únicas ou sequênciais (2 e 4 vezes). As avaliações foram feitas por ocasião da maturação das uvas, considerando-se a massa fresca dos cachos, dos engaços e das bagas, determinadas por meio de balança analítica; o comprimento e o diâmetro médio das bagas, utilizando-se de paquímetro; e o teor de sólidos solúveis (SS), por meio de refratômetro manual. Os experimentos foram conduzidos em delineamento experimental de blocos casualizados, representados por uma planta, com 15 repetições, no ano de 2006, e 10 repetições, no ano de 2007. Os dados foram submetidos à análise de variância e, para a comparação das médias dos tratamentos, foi utilizado o teste Skott Nott, ao nível de 5% de probabilidade. Observou-se que o uso dos reguladores promoveu o crescimento das bagas na cultivar BRS Clara em todos os tratamentos, diferindo da testemunha.
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Pós-graduação em Agronomia - FEIS
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV
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Pós-graduação em Agronomia (Horticultura) - FCA
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)