Light regulated protein kinase activity in thylakoid membranes of NaCl salt stressed seedlings

摘要

Light dependent kinase is reported to play a significant role in the adaptive response of plants to stress by regulating the excited energy distribution between the two phostosystems, especially for high light stress (Misra and Biswal, 2000). Most of the studies on kinase mediated protein phosphorylation of thylakoids are confined to light-dark adaptation (Allen, 1992; Bennett, 1991; Pursiheimo et al, 1998). This is one of the important signal transduction pathways in chloroplasts for external stimuli. Thylakoid membrane kinase activity might also play a role in salt stress adaptation in plants. Such studies during the salt stress of plants is meagre. Indian mustard and mung bean are well characterised for their variations in salt tolerance (Misraet al, 1999; Sahu et al, 1998). The PS II activity and the thylakoid membrane protein levels differed in these two plants during salt stress. So in the present study we verify this hypothesis that thylkoid membrane bound kinases can also play a role inthe variations in the salt tolerance mechanism in plants, by using a genetically salt tolerant plant -Indian mustard and a salt susceptible plant -Mung bean.