Enzymatic antioxidant responses to biostimulants in maize and soybean subjected to drought

Scientia Agricola

Ana Carolina Feitosa De Vasconcelos¹  Xunzhong Zhang²  Erik H. Ervin²  Jorge De Castro Kiehl¹ 

[1] ,Virginia Polytechnic Institute and State University Dept. of Crop and Soil Environmental Sciences Blacksburg VA ,USA

关键词: superoxide dismutase;    catalase;    ascorbate peroxidase;    water status;    superoxide dismutase;    catalase;    ascorbate peroxidase;    status hídrico;   

DOI  :  10.1590/S0103-90162009000300015

来源: SciELO

【 摘 要 】

Water stress is one of the most important environmental factors inducing physiological changes in plants, such as decrease in the water potential of the cells, the stomatal closure; and the development of oxidative processes mediated by reactive oxygen species (ROS). Antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) are efficient scavengers of ROS. The aim of this research was to examine how the application of biostimulant based on humic substances and aminoacids may affect activity levels of SOD, CAT, and APX of maize and soybean plants under well-watered or drought stress conditions. Pots (4.5 L) were filled with a Typic Hapludult soil where the biostimulants doses were applied. It was taken leaf samples in order to analyze SOD, CAT, and APX activities in plants. SOD and APX activity levels were increased by application of biostimulant 1 in maize subjected to stress. Catalase activity was not enhanced in plants by using the biostimulants. The composition of the biostimulants was not able to enhance stress tolerance in maize and soybean plants subjected to water stress.

【 授权许可】

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