Abstract
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.
Highlights
Plants are subjected to several environmental stresses that adversely affect growth, metabolism, and yield
Plant cells are protected by a complex antioxidant system comprised of non-enzymic as well as enzymic antioxidants, such as superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) (Noctor & Foyer, 1998)
Biostimulants are available in a variety of formulations and ingredients, but they are generally classified into three major groups on the basis of their source and content: humic substances, hormone containing products, and amino acid containing products (Akande, 2006)
Summary
Plants are subjected to several environmental stresses that adversely affect growth, metabolism, and yield. The detoxification mechanisms constitute the second line of defense against the detrimental effects of ROS (Gratão et al, 2005). Any potential tool available to crop managers for improving overall plant performance and quality during exposure to environmental stress would likely be a welcome addition to an already existing agronomic fertility program. In this way, biostimulants are available in a variety of formulations and ingredients, but they are generally classified into three major groups on the basis of their source and content: humic substances, hormone containing products, and amino acid containing products (Akande, 2006). Hormone containing products, such as seaweed extracts, contain identifiable amounts of active plant growth substances such as auxins, cytokinins, or their derivatives (Kauffman III et al, 2007)
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