Aplicação de ácido húmico via solo atenua os impactos adversos da alcalinidade na rosa
DOI:
https://doi.org/10.1590/2447-536X.v30.e242710%20Palavras-chave:
enzima antioxidante, extravasamento de eletrólitos, malondialdeído, prolina, proteína, teor de açúcarResumo
O estresse alcalino é um importante fator ambiental que limita o crescimento e a produtividade das roseiras. O ácido húmico (AH) é uma substância natural que demonstrou ter vários efeitos benéficos no crescimento das plantas e na tolerância ao estresse. As rosas (Rosa hybrida L.) estão entre as flores de corte mais importantes e populares do mundo, dominando o mercado de exportação de flores de corte. Este estudo investigou os efeitos da aplicação de AH nas propriedades fisiológicas e bioquímicas de roseiras cultivadas em condições alcalinas. Foi utilizado delineamento inteiramente casualizado com três repetições. Cada repetição consistiu de dois vasos contendo uma única planta de rosa. O ácido húmico foi aplicado nas doses de 0, 500, 1.000 e 2.000 mg L-1 via solo em intervalos de 15 dias durante dois meses. Plantas tratadas com 1.000 mg L-1 de HA exibiram níveis significativamente mais elevados de proteína total, prolina, atividade de catalase, atividade de guaiacol peroxidase e capacidade antioxidante. As plantas controle (que não receberam AH) apresentaram os maiores níveis de malondialdeído e vazamento de eletrólitos, indicando maior dano celular. Plantas tratadas com 500 mg L-1 de HA apresentaram maior teor de açúcar e atividade de ascorbato peroxidase. No geral, os resultados deste estudo sugerem que a aplicação de AH pode ser uma estratégia eficaz para melhorar a tolerância das roseiras ao stress alcalino e aumentar o seu crescimento e produtividade em solos alcalinos.
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