Influence of Azospirillum lectins on the antioxidant system response in wheat seedling roots during abiotic stress
Svetlana A. Alen’kina
A * and Maria A. Kupryashina A
+ Author Affiliations
- Author Affiliations
A Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, 13 Prospekt Entuziastov, Saratov 410049, Russian Federation.
Soil Research 60(2) 197-209 https://doi.org/10.1071/SR21092
Submitted: 6 April 2021 Accepted: 24 August 2021 Published: 8 November 2021
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Azospirillum spp. are plant-growth-promoting rhizobacteria. The surface lectins of A. brasilense strain Sp7 and A. baldaniorum strain Sp245 can attach to specific carbohydrates, and ensure the binding of the bacteria to the root surface. We investigated possible effects of A. brasilense Sp7 and A. baldaniorum Sp245 lectins on the activities of antioxidant enzymes and on the content of low-molecular-weight antioxidants in the roots of 4-day-old wheat seedlings. The roots were exposed to a number of simulated abiotic stresses: hypothermic, hyperthermic, drought, and salinity stresses. Under all stresses, both lectins increased peroxidase and superoxide dismutase activities and decreased catalase activity. The lectins differed in the intensity of induction of changes in the amounts of the low-molecular-weight antioxidants in wheat roots. They also differed in functional activity owing to their different carbohydrate specificities and structures. The data suggest broader possibilities of lectins in terms of the effect on the metabolism of host plants, and they permit adjustments to be made to the current understanding of the mechanisms that control the associative interactions between plants and bacteria.
Keywords: abiotic stresses, antioxidants, Azospirillum, bacterial proteins, plant-growth-promoting rhizobacteria, plants, wheat roots.
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