Biomics

We examined the effect of the lectins from two Azospirillum strains - A. brasilense Sp7 (epiphytic strain) and A. brasilense Sp245 (endophytic strain) on the activities of antioxidant enzymes in roots of 4-day-old seedlings of wheat under short-term (2 h) hypothermic and hyperthermic stresses. Under all stresses, both lectins increased peroxidase and superoxide dismutase activities and decreased catalase activity, but the periods of effect and the concentrations involved were different. The differences in functional activity between the lectins could be due to the unequal carbohydrate specificity and protein structure. Our results indicate that the Azospirillum lectins are implicated in adaptational changes in wheat seedling roots. This promotes the normal course of metabolism and ensures regulation of the plant-Azospirillum interaction under abiotic stress.

rhizosphere, associative nitrogen fixation, Azospirillum, lectins, wheat seedling roots, antioxidant enzymes, abiotic stresses

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