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Change in protein mass of PEP carboxylase in the leaves of Mesembryanthemum cordifolium under drought

Wang Yuehao, Chen Jingzhi, Shi Jiaonai

Shanghai Inst. Plant Physiol., Acad. Sin.

Abstract

The level of PEP-carboxylase activity in the leaves of M. cordifolium, an inducible CAM plant, increased greatly after drought and salt stress. Marked increase in PEP-carboxylase protein after drought was shown. Parallelism in the change of the activity level and protein mass of PEP-carboxylase was observed in the course of drought treatment, showing that the increase in PEP-carboxylase activity was due to the increase in its protein mass. After rewatering, the levels of PEP-carboxylase activity and protein mass decreased simultaneously, and , two weeks later, both of them decreased to the same levels as those before drought. Increase in PEP-carboxylase level and decrease in RubisCO level may be part of the biochemical features of CAM induction by drought in M. cordifolium. After drought, the most marked increase in PEP-carboxylase activity and protein mass was observed in middle mature leaves, little change can be seen in the youngest leaf.

Key words: Mesembryanthemum;Cardifolium;*Inducible CAM;Drought

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Citing This Article：

Wang Yuehao, Chen Jingzhi, Shi Jiaonai. Change in protein mass of PEP carboxylase in the leaves of Mesembryanthemum cordifolium under drought. Acta Physiol Sin 1991; 43 (2): (in Chinese with English abstract).