Controle hormonal do déficit hídrico em tomateiro




Auxina, Giberelina, Micro-Tom


O déficit hídrico é um dos principais fatores limitantes da produção agrícola. Por isso, as plantas têm desenvolvido mecanismos de sobrevivência e aclimatação à condição de déficit hídrico, por exemplo, o fechamento estomático que visa minimizar a perda de água pela planta. Com efeito, as respostas das plantas ao déficit hídrico são controladas diretamente pelo balanço hormonal. Assim, o objetivo do presente estudo foi avaliar como diferentes mutantes hormonais de tomateiro respondem à condição de déficit hídrico. Foram utilizados cinco genótipos de tomateiro, o cultivar Micro-Tom (MT), tipo selvagem, os mutantes Never ripe (Nr), com baixa sensibilidade ao etileno, diageotropica (dgt), com baixa sensibilidade à auxina, e os transgênicos L19 (com elevada biossíntese de giberelina) e SL (com baixa biossíntese de estrigolactonas). As plantas foram cultivadas em vasos de polietileno com capacidade para 350 mL preenchidos com substrato comercial. Durante o desenvolvimento, todas as plantas foram diariamente irrigadas até o início do déficit hídrico, 37 dias após a semeadura (DAS). A fim de induzir o déficit hídrico, a irrigação foi suspensa em parte das plantas por um período de sete dias. Plantas-controle foram irrigadas continuamente. Depois de sete dias nas respectivas condições (irrigada e déficit hídrico), as plantas foram colhidas para a realização das análises de crescimento, conteúdo relativo de água (CRA) e extravasamento de eletrólitos. Como esperado, plantas de L19 exibiram maior altura de plantas, enquanto plantas de SL apresentaram maior acúmulo de massa fresca e seca da parte aérea em condição controle. Em condição de déficit hídrico, observou-se redução de massa fresca e altura de plantas em todos os genótipos avaliados. Enquanto que apenas plantas de MT e SL não sofreram redução de massa seca da parte aérea em função da restrição hídrica. Quanto ao CRA, apenas plantas de L19 não apresentaram redução sob condição de déficit hídrico.


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Como Citar

SOUZA, P. C. da S.; MARTINS, F. B.; GAION, L. A. Controle hormonal do déficit hídrico em tomateiro. Revista de Ciências Agroveterinárias, Lages, v. 20, n. 4, p. 271-277, 2021. DOI: 10.5965/223811712042021271. Disponível em: Acesso em: 1 jun. 2023.



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