Aplicação de ácido húmico via solo atenua os impactos adversos da alcalinidade na rosa

Autores

DOI:

https://doi.org/10.1590/2447-536X.v30.e242710%20

Palavras-chave:

enzima antioxidante, extravasamento de eletrólitos, malondialdeído, prolina, proteína, teor de açúcar

Resumo

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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Biografia do Autor

Sahar Moradi, Urmia University

Faculty of Agriculture, Department of Horticultural Science, Urmia, Iran.

Jafar Amiri, Urmia University

Faculty of Agriculture, Department of Horticultural Science, Urmia, Iran.

Zohreh Jabbarzadeh, Urmia University

Faculty of Agriculture, Department of Soil Science, Urmia, Iran.

MirHassan Rasouli-Sadaghiani, Urmia University

Faculty of Agriculture, Department of Soil Science, Urmia, Iran.

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2024-06-13

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