Regulation of Respiration in Some Herbaceous Plants
of the Forest Zone

T. I. Ivanova, O. V. Kirpichnikova, O. S. Yudina, and O. A. Semikhatova

Komarov Botanical Institute, Russian Academy of Sciences, ul. Professora Popova 2, St. Petersburg, 197376 Russia

Received June 19, 1995

Abstract—Regulation of dark respiration in the leaves of plants (at flowering or fruit-bearing phases) differing
in seasonal growth patterns was studied by using exogenous glucose as a glycolytic substrate, malate as a Krebs
cycle intermediate, and glycine, as well as various inhibitors of terminal oxidases. Leaf respiration of all exam-
ined plant species was stimulated by glycolytic and Krebs cycle substrates and was under adenylate control. In
the leaves of ephemeroids, some additional enhancement of respiration upon a concerted action of an exoge-
nous substrate and an uncoupler was observed, being most pronounced with a Krebs cycle substrate. No stim-
ulation of this type was seen in the leaves of a long-vegetating plant, thus convincingly indicating the occur-
rence of a more severe, as compared to ephemeroids, restraint on dark respiration at the level of glycolytic flux.

Key words: ephemeroids - regulation of respiration - glycolysis - Krebs cycle - terminal oxidases

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