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Changes of phospholipid and fatty acid composition in chloroplast envelope membrane during bean leaf senescence

Chen Kaoshan, Zhang Chenglie, Liang Houguo

Dept. Biol., Lanzhou Univ.

Abstract

The lipids of chloroplast envelope membrane from primary leaves of Phaseolus vulgaris are composed of phosphatidyl choline(PC), diphosphatidyl glycerol(PG), monogalactodiglyceride(MGDG) and digalactodiglyceride (DGDG). MGDG/DGDG ratio had no marked changes during leaf senescence. The period of the change of phospholipids in chloroplast envelope membrane from the senescing leaves coincided with the priod of decrease of chloroplast electrophoretic mobility rate. The main composition of fattyacids in chloroplast envelope membrane from primary leaves of P. vulgaris were palmitic and linoleic acids. The period of decrease of index of fatty acids in chloroplast envelope membrane also occurred 22~29 days after the emergence of primary leaves. These changes of phospholipid and fatty acid composition occurs concomittantly with the increase of the phase transition temperature in chloroplast envelope membrane and with the loss of chlorophyll in leaf tissues, but lagged behind the initiation of the decline of total protein in leaves.

Key words: Phaseelus outgasis;Leve senecnece;Chloroplast envelope membrane;Lipids of envelope membrane;

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Citing This Article：

Chen Kaoshan, Zhang Chenglie, Liang Houguo. Changes of phospholipid and fatty acid composition in chloroplast envelope membrane during bean leaf senescence. Acta Physiol Sin 1991; 43 (2): (in Chinese with English abstract).