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Mol. Cells 2009; 28(5): 417-422

Published online October 21, 2009

https://doi.org/10.1007/s10059-009-0137-5

© The Korean Society for Molecular and Cellular Biology

Rhythmic Expression of Mitogen Activated Protein
Kinase Activity in Rice

Kudupudi Prabhakara Rao, Gubbala Vani, Kundan Kumar, and Alok Krishna Sinha

Received: June 1, 2009; Revised: August 12, 2009; Accepted: August 26, 2009

Abstract

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.

Keywords circadian clock, diurnal rhythm, mitogen activated protein kinase (MAPK), rice, signal transduction

Article

Research Article

Mol. Cells 2009; 28(5): 417-422

Published online November 30, 2009 https://doi.org/10.1007/s10059-009-0137-5

Copyright © The Korean Society for Molecular and Cellular Biology.

Rhythmic Expression of Mitogen Activated Protein
Kinase Activity in Rice

Kudupudi Prabhakara Rao, Gubbala Vani, Kundan Kumar, and Alok Krishna Sinha

Received: June 1, 2009; Revised: August 12, 2009; Accepted: August 26, 2009

Abstract

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.

Keywords: circadian clock, diurnal rhythm, mitogen activated protein kinase (MAPK), rice, signal transduction

Mol. Cells
May 31, 2023 Vol.46 No.5, pp. 259~328
COVER PICTURE
The alpha-helices in the lamin filaments are depicted as coils, with different subdomains distinguished by various colors. Coil 1a is represented by magenta, coil 1b by yellow, L2 by green, coil 2a by white, coil 2b by brown, stutter by cyan, coil 2c by dark blue, and the lamin Ig-like domain by grey. In the background, cells are displayed, with the cytosol depicted in green and the nucleus in blue (Ahn et al., pp. 309-318).

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