Teores de carboidratos em limeiras ácidas 'Tahiti' tratadas com paclobutrazol
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Data
2007-08
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Revista Brasileira de Fruticultura
Resumo
O paclobutrazol (PBZ) pode retardar o crescimento e induzir o florescimento de citros mediante a inibição da biossíntese de giberelinas. Além disso, outras características das plantas podem ser influenciadas pela aplicação do PBZ, como as concentrações e distribuição de carboidratos. O trabalho foi realizado com objetivo de estudar as possíveis relações entre concentrações e distribuição de carboidratos na planta e a aplicação do PBZ, em limeiras 'Tahiti' enxertadas sobre limoeiro 'Cravo' e cultivadas em vasos de cinco litros. O PBZ foi aplicado nas plantas conduzidas em câmara de crescimento, sob temperatura controlada (28º C dia/ 18º C noite) e fotoperíodo de 16 horas de luz, com fluxo de fótons fotossintético de aproximadamente 170 µmol m-2 s-1. A aplicação do PBZ causou reduções significativas dos teores foliares de carboidratos por ter induzido maior florescimento da limeira ácida 'Tahiti'. A aplicação do paclobutrazol resultou no acúmulo de reservas de carboidratos nas raízes.
The Placobutrazol (PBZ) can delay the growth and induce the flowering of citrus through the inhibition of biosynthesis of gibberellins. Besides, other features of the plants can be influenced by the application of PBZ, as well as the concentrations and distribution of carbohydrates. The work was carried out aiming to study the possible relationships between concentrations and distribution of carbohydrates in the plant and application of PBZ in acid lime tree 'Tahiti', grafted on lemon tree 'Cravo' and cultivated in pots of five litters. The PBZ was applied in plants conducted in a growth chamber, under controlled temperature (28º C day/ 20º C night), and photoperiod of 16 hours with light, with photosynthetic photons flow of about 170 µmol m-2 s-1. The application of PBZ caused significant reductions on the levels of carbohydrates in the leaves because they induced the flowering in the acid lime tree 'Tahiti'. The application of paclobutrazol resulted in the accumulation of reserves of carbohydrates in the roots.
The Placobutrazol (PBZ) can delay the growth and induce the flowering of citrus through the inhibition of biosynthesis of gibberellins. Besides, other features of the plants can be influenced by the application of PBZ, as well as the concentrations and distribution of carbohydrates. The work was carried out aiming to study the possible relationships between concentrations and distribution of carbohydrates in the plant and application of PBZ in acid lime tree 'Tahiti', grafted on lemon tree 'Cravo' and cultivated in pots of five litters. The PBZ was applied in plants conducted in a growth chamber, under controlled temperature (28º C day/ 20º C night), and photoperiod of 16 hours with light, with photosynthetic photons flow of about 170 µmol m-2 s-1. The application of PBZ caused significant reductions on the levels of carbohydrates in the leaves because they induced the flowering in the acid lime tree 'Tahiti'. The application of paclobutrazol resulted in the accumulation of reserves of carbohydrates in the roots.
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Palavras-chave
Citrus latifolia Tanaka, Fitorreguladores, Estresse hídrico, Phytoregulators, Hydric stress