Avaliação do efeito de pigmentos fenólicos na germinação de arroz sob condições de baixa temperatura

Autores

DOI:

https://doi.org/10.5965/223811712142022410

Palavras-chave:

arroz preto, arroz vermelho, capacidade antioxidante, estresse por frio, flavonoides

Resumo

No Rio Grande do Sul, principal estado produtor de arroz do Brasil, baixas temperaturas podem ocorrer durante a germinação e estabelecimento de plântulas, e em alguns casos, durante o estádio reprodutivo. Quando baixas temperaturas ocorrem no estádio inicial de desenvolvimento causam atraso da germinação, resultando em um crescimento não homogêneo. No estádio reprodutivo, baixas temperaturas podem ocasionar esterilidade das espiguetas, interferindo diretamente na produtividade da planta. Pesquisas têm mostrado que alguns compostos fenólicos como as proantocianidinas e antocianinas estão associadas com tolerância a baixa temperatura em plantas devido sua capacidade antioxidante. A coloração vermelha e preta nas sementes de alguns genótipos de arroz é conferida pelos compostos fenólicos proantocianidinas e antocianinas, respectivamente. Portanto, o objetivo desse estudo foi verificar se os genótipos de arroz com sementes vermelhas ou pretas são mais tolerantes a baixas temperaturas durante a germinação. Neste trabalho, cinco genótipos foram testados, dois com sementes sem pigmentação e com resposta contrastante para tolerância a baixa temperatura (BRS Bojuru - tolerante e BRS Pampeira - sensível), dois genótipos com sementes vermelhas (BRS 902, SCS 119 Rubi) e um genótipo com sementes pretas (SCS 120 Ônix). Como esperado, os genótipos com sementes pigmentadas têm maior conteúdo de compostos fenólicos totais. Entretanto, sob condições de baixa temperatura, os genótipos com semente pigmentada mostraram resposta similar ao genótipo sensível. Dessa forma, a presença de proantocianidinas e antocianinas nas sementes dos genótipos estudados não confere tolerância a baixas temperaturas durante a germinação.   

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Publicado

2022-12-12

Como Citar

MALTZAHN, L. E. .; VIANA, V. E. .; ARANHA, B. C. .; CUSTÓDIO, T. V. .; VENSKE, E. .; MAIA, L. C. da .; OLIVEIRA, A. C. de .; PEGORARO, C. Avaliação do efeito de pigmentos fenólicos na germinação de arroz sob condições de baixa temperatura. Revista de Ciências Agroveterinárias, Lages, v. 21, n. 4, p. 410 - 418, 2022. DOI: 10.5965/223811712142022410. Disponível em: https://revistas.udesc.br/index.php/agroveterinaria/article/view/22345. Acesso em: 6 fev. 2023.

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Seção

Artigo de Pesquisa - Ciência de Plantas e Produtos Derivados

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