The Alternative Respiration Pathway in Leaves ofRhodiola roseaand Ajuga reptans: Presumable Physiological Role |
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Authors: | Golovko T K Pystina N V |
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Institution: | (1) Institute of Biology, Komi Research Center, Ural Division, Russian Academy of Sciences, ul. Kommunisticheskaya 28, Syktyvkar, 167982, Russia |
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Abstract: | The effect of growth conditions and plant age on the relationships between respiratory pathways was investigated in Rhodiola roseaand Ajuga reptans.The alternative pathway (AP) contributed 0–50% to the leaf respiration; however, this pathway was absent from the overwintered leaves of A. reptans.In both plant species, AP contributed 15–20% to the respiration of mature leaves, and in the young rapidly expanding leaves the contribution was twice higher. The highest AP contribution (40–50%) was found in the leaves of A. reptansplants grown in an experimental plot in full light. As compared to the plot-grown plants, A. reptansplants grown in their natural habitats were characterized by a lower AP contribution to the respiration of leaves; they contained two times less nonstructural carbohydrates and accumulated less biomass. We conclude that a high AP contribution to the respiration of leaves correlates with their rapid growth and that a high supply of respiratory substrates is one of prerequisite for the AP activation. |
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Keywords: | Rhodiola rosea Ajuga reptans respiration respiratory pathway alternative pathway alternative oxidase carbohydrates growth |
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