Biorreguladores em feijoeiro cultivado sob dois regimes hídricos

Autores

  • Miller Henrique Ferreira Universidade Federal de Viçosa, Viçosa, MG, Brasil.
  • Danúbia Aparecida Costa Nobre Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brasil.
  • Willian Rodrigues Macedo Universidade Federal de Viçosa, Viçosa, MG, Brasil. http://orcid.org/0000-0003-4660-913X

DOI:

https://doi.org/10.5965/223811711912020054

Palavras-chave:

ácido abscísico, metil jasmonato, agricultura tropical, déficit hídrico

Resumo

Restrições na disponibilidade hídrica favorecem eventuais danos à cultura do feijoeiro, e o uso de biorreguladores aprimora a sinalização vegetal e potencializa a indução de tolerância ao déficit hídrico. Este estudo objetivou caracterizar alterações fisiológicas, bioquímicas e biométricas em plantas de feijão submetidas à aplicação foliar de biorreguladores sob diferentes regimes hídricos. O ensaio consistiu na aplicação de um controle (água) e três biorreguladores (5 µM de ácido abscísico - ABA; 50 µM de metil jasmonato - MeJA e 5 µM de ABA + 50 µM de MeJA), além de apresentar dois regimes hídricos (60 e 80% da capacidade de campo), num esquema fatorial 4 x 2. Foram analisados: conteúdo de pigmentos fotossintetizantes, trocas gasosas foliares e índices biométricos das plantas de feijoeiro. Com resultado observou-se que o tratamento ABA+MeJA incrementou a concentração de clorofila b, atividades de ascorbato peroxidase (APX) e catalase (CAT), enquanto a taxa fotossintética foi estimulada pela mistura de biorreguladores aos 36 dias após o plantio (DAP), ABA e MeJA, isolados, propiciaram maior taxa fotossintética no feijoeiro aos 34 DAP, enquanto para as variáveis biométricas somente foram influenciadas pelos regimes hídricos, com relação aos mecanismos bioquímicos, constatou-se que o tratamento ABA+MeJA incrementou a atividade das enzimas antioxidantes e melhorou as respostas de trocas gasosas em condição de menor disponibilidade hídrica. Os biorreguladores avaliados nesta pesquisa são benéficos na modulação da fisiologia vegetal em plantas sob estresse hídrico, entretanto o suprimento de água adequado retrata um melhor desenvolvimento das plantas.

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Publicado

2020-04-03

Como Citar

FERREIRA, Miller Henrique; NOBRE, Danúbia Aparecida Costa; MACEDO, Willian Rodrigues. Biorreguladores em feijoeiro cultivado sob dois regimes hídricos. Revista de Ciências Agroveterinárias, Lages, v. 19, n. 1, p. 54–63, 2020. DOI: 10.5965/223811711912020054. Disponível em: https://revistas.udesc.br/index.php/agroveterinaria/article/view/14958. Acesso em: 28 mar. 2024.

Edição

Seção

Artigo de Pesquisa - Ciência de Plantas e Produtos Derivados