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A cause of higher photochemical efficiency of photosystem II in a chlorophyll-deficient barley mutant

Tan Xinxing, Xu Daquan, Tang Zesheng

Shanghai Institute of Plant Physiology,The Chinese Academy of Sciences.Shanghai 200032；China

Abstract

As compared with the wild-type, the light absorption of chloroplasts in mutant barley was slightly higher within 450-480 nm and 600-640 nm but much higher within 400-440 nm and 700-740 nm in the case of equal amount of chlorophyll. The mutant had a lower chlorophyll fluorescence yield at low temperature (77K), but a higher ratio of fluorescence yield of PS II to that of PS I, F685/F735. The effects of Mg~(2+) depletion, which could lower the F685/F735 ratio and the photochemical efficiency of PS II, Fv/Fm, were weaker in the mutant than in the wild-type. Marked changes in chloroplast ultrastructure, such as fewer grana stacks and longer stromal lamellae, were observed in the mutant.

Key words: PS Ⅱ photochemical efficiency;Excitation energy transfer;Chlorophyll fluorescence;Chlorophyll-deficient mutant;Barley

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Citing This Article：

Tan Xinxing, Xu Daquan, Tang Zesheng. A cause of higher photochemical efficiency of photosystem II in a chlorophyll-deficient barley mutant. Acta Physiol Sin 1997; 49 (3): (in Chinese with English abstract).