Activities of respiratory pathways and the pool of nonstructural carbohydrates in greening leaves of spring wheat seedlings

Activities of respiratory pathways and the pool of nonstructural carbohydrates in greening leaves... Seedlings of spring wheat (Triticum aestivum L.) were used to study the dynamics of leaf respiration, the respiratory pathway ratio, and relation of activities of these pathways to the content of soluble carbohydrates in the leaf during greening of seedlings for 48 h under continuous photosynthetically active light (190 μmol/(m2 s)). Changes in leaf respiration during de-etiolation were closely related to modulation of the alternative respiratory pathway (AP) activity. The rate of cytochrome respiratory pathway (CP) depended directly on the carbohydrate content and growth rate. These relations suggest that the substrate regulation of CP activity during greening is mediated by the energy needs for growth and is effectively regulated by the mechanism of respiratory control. The highest rates of AP were observed after a 6-h exposure of seedlings to light. The proportion of CP/AP at this stage was close to unity. The temporal pattern of AP activity during de-etiolation was independent on the content of soluble carbohydrates. Hence, in addition to substrate regulation of AP, there are other intricate mechanisms of AP involvement. Our results are in accordance to the state that the alternative respiratory pathway participates in maintaining homeostasis in phototrophic cells during development of the photosynthetic function. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Activities of respiratory pathways and the pool of nonstructural carbohydrates in greening leaves of spring wheat seedlings

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Publisher
Springer US
Copyright
Copyright © 2014 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443714020046
Publisher site
See Article on Publisher Site

Abstract

Seedlings of spring wheat (Triticum aestivum L.) were used to study the dynamics of leaf respiration, the respiratory pathway ratio, and relation of activities of these pathways to the content of soluble carbohydrates in the leaf during greening of seedlings for 48 h under continuous photosynthetically active light (190 μmol/(m2 s)). Changes in leaf respiration during de-etiolation were closely related to modulation of the alternative respiratory pathway (AP) activity. The rate of cytochrome respiratory pathway (CP) depended directly on the carbohydrate content and growth rate. These relations suggest that the substrate regulation of CP activity during greening is mediated by the energy needs for growth and is effectively regulated by the mechanism of respiratory control. The highest rates of AP were observed after a 6-h exposure of seedlings to light. The proportion of CP/AP at this stage was close to unity. The temporal pattern of AP activity during de-etiolation was independent on the content of soluble carbohydrates. Hence, in addition to substrate regulation of AP, there are other intricate mechanisms of AP involvement. Our results are in accordance to the state that the alternative respiratory pathway participates in maintaining homeostasis in phototrophic cells during development of the photosynthetic function.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Mar 7, 2014

References

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