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KMID : 0578320090280050417
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Molecules and Cells
2009 Volume.28 No. 5 p.417 ~ p.422
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Rhythmic expression of mitogen activated protein kinase activity in rice
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Kudupudi Prabhakara Rao
Gubbala Vani
Kundan Kumar
Alok Krishna Sinha
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Abstract
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Mitogen activated protein kinase (MAPK) are known to get activated during various stress signals and transduce the message from the cell membrane to the nucleus for appropriate cellular reorganization. Though, a certain basal activity of MAPK is often observed in the control plants. Prolonged exposure of rice plants to lowered or elevated temperature exhibited a rhythm in the activation of MAPKs. We analyzed existence of a possible endogenous rhythm in the activity of MAPKs in rice plants. The plants growing at constant temperature entrained in 16/8 h day-night cycle showed diurnal rhythm in activity. When the activation of MAPK was tested under continuous conditions by shifting plants to continuous darkness for a period of 72 h, the periodic rhythm persisted and followed a circadian pattern. Analysis of the transcripts of group A, B and C members of MAPKs under above conditions by quantitative real time PCR revealed that the members of group C exhibit periodic rhythm. Our data indicates that the MAP kinase activity in rice follows rhythmic expression in a circadian manner.
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KEYWORD
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circadian clock, diurnal rhythm, mitogen activated protein kinase (MAPK), rice, signal transduction
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