The alternative respiration pathway in leaves of Rhodiola rosea and Ajuga reptans: Presumable physiological role PDF Print E-mail

Golovko TK, Pystina NV: The alternative respiration pathway in leaves of Rhodiola rosea and Ajuga reptans: Presumable physiological role. Russian Journal of Plant Physiology 2001, 48(6):733-740.

The effect of growth conditions and plant age on the relationships between respiratory pathways was investigated in Rhodiola rosea and Ajuga reptans. The alternative pathway (AP) contributed 0-50% to the leaf respiration; however, this pathway was absent from the over-wintered 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. reptans plants grown in an experimental plot in full light. As compared to the plot-grown plants, A. reptans plants 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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