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The effects of salt stress on leaf ABA content and the diurnal regulation property of phosphoenolpyruvate carboxylase in Mesembryanthemum cordifolium

Tang Li, Shi Jiaonai

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

Abstract

After salt stress, the sensitivity toward the inhibitory action of L-malate of PEPCase from Mesembryanthemum cordifolium showed diurnal fluctuation. The day form PEPCase was more sensitive to the inhibition by L-malate than the night form. However, there was no difference in molecular weight between the day form and the night form of PEPCase. Both salt stress and drought elevated the leaf ABA level dramatically. The ABA level in drought-stressed leaves decreased markedly after the plants were rewatered, but the ABA level in salt-stressed leaves remained unchanged after soil salts were thoroughly washed out the the plants were well watered. External ABA treatment increased in leaf PEPCase activity and decreased the leaf water content. Externally applied 6-BA had similar effects on the plants as the ABA.

Key words: phosphoenolpyruvate carboxylase;Facultutive CAM plant;Salt stress;Mesembryanthemum cordi-folium

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Citing This Article：

Tang Li, Shi Jiaonai. The effects of salt stress on leaf ABA content and the diurnal regulation property of phosphoenolpyruvate carboxylase in Mesembryanthemum cordifolium. Acta Physiol Sin 1997; 49 (3): (in Chinese with English abstract).