REGULATION OF RESPIRATION IN SOME HERBACEOUS PLANTS OF THE FOREST ZONE

Regulation of dark respiration in the leaves of plants (at flowering o r fruit-bearing phases) differing in seasonal growth patterns was stud ied by using exogenous glucose as a glycolytic substrate, malate as a Krebs cycle intermediate, and glycine, as well as various inhibitors o f terminal oxidases. Leaf respiration of all examined plant species wa s stimulated by glycolytic and Krebs cycle substrates and was under ad enylate control. In the leaves of ephemeroids, some additional enhance ment of respiration upon a concerted action of an exogenous substrate and an uncoupler was observed, being most pronounced with a Krebs cycl e substrate. No stimulation of this type was seen in the leaves of a l ong-vegetating plant, thus convincingly indicating the occurrence of a more severe, as compared to ephemeroids, restraint on dark respiratio n at the level of glycolytic flux.