Abstract
Effect of kinetin on the state of etioplast inner membrane system in etiolated barley (Hordeum vulgare L.) seedlings was studied by quantifying changes in the ratio of fluorescence intensity of the long-wave form of protochlorophyllide (Pchlde) to that of its short-wave form (Pchlde657 and Pchlde633, respectively) in the leaf low-temperature spectra. Application of kinetin (20 μg/ml, sprinkling) resulted in a decrease of the Pchlde657/Pchlde633 ratio, and the heat shock (3 h at 40°C) strengthened this effect of kinetin. The change in the Pchlde657/Pchlde633 ratio induced by kinetin did not depend on the seedling age within the range of 5–7 days. Possible mechanisms of the kinetin effect on the etioplast membrane systems are discussed.
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