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.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 10, 2004
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