944 resultados para Reguladores vegetais


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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Pós-graduação em Agronomia - FEIS

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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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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Agronomia (Horticultura) - FCA

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Pós-graduação em Agronomia (Horticultura) - FCA

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Annonaceae is an important family of plants that constitutes the Brazilian flora. Anona species produce fruits for fresh consumption, medicinal use and other purposes. The aim of this study is to present information of literature about vegetative propagation by cutting of some Annonaceae species with potential for consumption and as rootstock. As conclusion, the literature presents a range of rooting results, even about the same species. The rooting success depends on the species, variety, stock plant, season, plant growth regulators, rooting environment and juvenility. Some species present rooting potential, but there are lack of literature about plant management and orchard installation. The use of plant growth regulators improves the rooting of the most species with potential to propagate by cuttings.

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This trial aimed to evaluate the effect of sequential applications of different plant regulators over growth and flower rachis emission of 'Meyer' zoysiagrass (Zoysia japonica). The study was conducted on 15-month old green turfgrass under a randomized complete block design with four replications. The following plant regulator and doses were tested: trinexapac-ethyl (113+113, 226+113, 226+226, 452+113, 452+226, 452+452, 678+339 e 904+452 g a.i./ha-1), prohexadione-calcium (100+100 e 200+200 g a.i. ha-1) and bispyribac-sodium (40+40 e 60+60 g a.i. ha-1), as well as an untreated control. The turfgrass was mowed again at 3.0 cm aboveground and the second plant regulator was applied when 'Meyer' zoysiagrass was between 5.0 and 6.0 cm high. The effect of the treatments was visually rated for visual injury, plant height, height and number of flower rachis, and total dry mass production of clippings. Only bispyribac-sodium had visual symptoms of injury on 'Meyer' zoysiagrass, and no intoxication was observed at 28 days after the second application (DAAB). The sequential applications of trinexapac-ethyl, prohexadione-calcium and bispyribac-sodium reduced by more than 80% the total clipping dry mass produced by 'Meyer' zoysiagrass. All the plant regulators tested also showed promising results in reducing the height and emission of rachis, especially when trinexapac-ethyl was applied at the doses 452+452, 678+339 and 904+452 g a.i. ha-1. 'Meyer' zoysiagrass turfgrass can be handled with the sequential application of a plant regulator, which reduces the need for mowing over a period up to 110 days after the application of the second plant regulator, and it also avoids deleterious visual effects over turfgrass.

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Trials were carried out in Juazeiro, Bahia State, Brazil, aiming to test plant regulators composed by gibberellin, cytokine and auxin effects on chemical quality of Superior Seedless grape berries. The first trial studied the effects of Stimulate (R) (bio regulator) and X-Cyte (R) (cytokine) associated to a new gibberellin formulation (N-Large (R)) and associated to Pro-Gibb (R), which is a product used as source of gibberellin. Products were sprayed at berries development phase (18, 21, 51 and 56 days after spur-pruning). Treatments were: T1: Pro-Gibb (R); T2: Stimulate (R) (Dose 1); T3: Stimulate (R) (Dose 2); T4: Stimulate (R) (Dose 3); T5: Pro-Gibb (R) + X-Cyte (R) (Low Dose - DB); T6: Pro-Gibb (R) + X-Cyte (R) (Intermediate Dose - DM); T7: Pro-Gibb (R) + X-Cyte (R) (High Dose - DA); T8: N-Large (R); T9: N-Large (R) + X-Cyte (R) (DB); T10: N-Large (R) + X-Cyte (R) (DM); T11: N-Large (R) + X-Cyte (R) (DA). The second trial aimed to assess the effect of the new gibberellin formulation (N-Large (R)) associated or not with cytokine (X-Cyte (R)) also sprayed straight over the bunches at berries development phase (17, 55 e 66 days after spur-pruning). Treatments were: T1: Pro-Gibb (R) - blank; T2: N-Large (R) (DB); T3: N-Large (R) (DM); T4: N-Large (R) (DA); T5: N-Large (R) (DB) + X-Cyte (R) (DB); T6: N-Large (R) (DB) + X-Cyte (R) (DM); T7: N-Large (R) (DB) + X-Cyte (R) (DA); T8: N-Large (R) (DM) + X-Cyte (R) (DB); T9: N-Large (R) (DM) + X-Cyte (R) (DM); T10: N-Large (R) (DM) + X-Cyte (R) (DA); T11: N-Large (R) (DA) + X-Cyte (R) (DB); T12: N-Large (R) (DA) + X-Cyte (R) (DM); T13: N-Large (R) (DA) + X-Cyte (R) (DA). Experimental design was random blocks with four repetitions with each repetition/parcel having three useful plants in the same row. At harvest, when bunches average had soluble solids over 15 degrees Brix, berries were collected for soluble solids, pH, titratable acidity analysis as well as (SS/AT) ratio calculation. In both trials, plant regulators evaluated did not provide significant changes on chemical quality of 'Superior Seedless' grape berries. Therefore, the lack of differences on response between the commercially used product (Pro-Gibb (R)) and the other products tested (Stimulate (R), X-Cyte (R) e N-Large (R)) prove the last as promising for the ` Superior Seedless' grape cultivation, leaving a larger range of alternative for grape farmers in the Sao Francisco Valley, Bahia.

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Pós-graduação em Ciências Biológicas (Botânica) - IBB