Affiliation:
1. Siberian Institute of Plant Physiology and Biochemistryof the Siberian Branch of RAS
Abstract
In the adhesion zone of the etiolated pea seedling roots, located at a distance of 5–15 mm from its apex, 1 and 24 hours after inoculation with the bacteria Rhizobium, the effect of exogenous 10–11 M indol-acetic acid (IAA) and 10–9 M 6-benzylaminopurine (BAP) on cell metabolism was investigated. The inoculated seedlings were used as control that is not exposed to the action of phytohormones. Phytohormone-induced changes in the activity of soluble and cell wall-related peroxidases (PO) and polyphenol oxidases (PPO), tissue concentrations of hydrogen peroxide (H2O2), nitric oxide (NO), “soluble” (extracted by ethyl acetate and n-butanol) and “insoluble” phenolic compounds (PCs), flavonoids are discussed. The analysis of the obtained results shows that in both observation periods, the exogenous effect of the IAA enhanced protective responses in the cells of the adhesion zone, and the action of BAP weakened them. It is shown that the differences in the metabolism of adhesion zone cells resulting from the action of exogenous BAP and IAA are related to their diametrically opposite effect on nodulation.
Publisher
The Russian Academy of Sciences
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