Enzymes of sucrose dissimilation as targets for nitrate in early ontogenesis of garden pea

Enzymes of sucrose dissimilation as targets for nitrate in early ontogenesis of garden pea We experimentally tested a possibility that nitrate regulates sucrose synthase (SS) in the roots, vacuolar acid invertase (AcI) in the stems, and alkaline invertase (AlI) in the leaves of garden pea (Pisum sativum L.) where they were predominantly located. In the course of early ontogenesis of the seedlings (0–20 days), NO 3 - stimulated solely SS. We detected three peaks of nitrate-dependent enzyme activity: the greatest peak was observed in the very beginning of germination (48 h from seed imbibition), the intermediate peak corresponded to the most intense utilization of cotyledonal reserves (sixth to eighth day of growth), and the lowest peak coincided with development of autotrophy (tenth to 20th day). In the period of their greatest activity (sixth to 14th day), neither invertases noticeably respond to nitrate. At the first peak, NO 3 - affected SS already at a concentration of 1 mM; this influence was maintained at concentrations rising to 10 mM, which points to a signal nature of the effect. We discuss a functional aspect of the effect of nitrate on SS involved in the system of the enzymes of sucrose dissimilation upon the initiation and development of different physiological processes occurring in this period, as well as its possible applied role in agricultural biotechnologies. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Enzymes of sucrose dissimilation as targets for nitrate in early ontogenesis of garden pea

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Publisher
Pleiades Publishing
Copyright
Copyright © 2016 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443715060138
Publisher site
See Article on Publisher Site

Abstract

We experimentally tested a possibility that nitrate regulates sucrose synthase (SS) in the roots, vacuolar acid invertase (AcI) in the stems, and alkaline invertase (AlI) in the leaves of garden pea (Pisum sativum L.) where they were predominantly located. In the course of early ontogenesis of the seedlings (0–20 days), NO 3 - stimulated solely SS. We detected three peaks of nitrate-dependent enzyme activity: the greatest peak was observed in the very beginning of germination (48 h from seed imbibition), the intermediate peak corresponded to the most intense utilization of cotyledonal reserves (sixth to eighth day of growth), and the lowest peak coincided with development of autotrophy (tenth to 20th day). In the period of their greatest activity (sixth to 14th day), neither invertases noticeably respond to nitrate. At the first peak, NO 3 - affected SS already at a concentration of 1 mM; this influence was maintained at concentrations rising to 10 mM, which points to a signal nature of the effect. We discuss a functional aspect of the effect of nitrate on SS involved in the system of the enzymes of sucrose dissimilation upon the initiation and development of different physiological processes occurring in this period, as well as its possible applied role in agricultural biotechnologies.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Feb 16, 2016

References

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