Dec 16, 2003

Molecular genetic perspectives on cross-talk and specificity in abiotic stress signalling in plants

Journal of Experimental Botany
Viswanathan ChinnusamyJian-Kang Zhu

Abstract

The perception of abiotic stresses and signal transduction to switch on adaptive responses are critical steps in determining the survival and reproduction of plants exposed to adverse environments. Plants have stress-specific adaptive responses as well as responses which protect the plants from more than one environmental stress. There are multiple stress perception and signalling pathways, some of which are specific, but others may cross-talk at various steps. Recently, progress has been made in identifying components of signalling pathways involved in salt, drought and cold stresses. Genetic analysis has defined the Salt-Overly-Sensitive (SOS) pathway, in which a salt stress-induced calcium signal is probably sensed by the calcium-binding protein SOS3 which then activates the protein kinase SOS2. The SOS3-SOS2 kinase complex regulates the expression and activity of ion transporters such as SOS1 to re-establish cellular ionic homeostasis under salinity. The ICE1 (Inducer of CBF Expression 1)-CBF (C-Repeat Binding Protein) pathway is critical for the regulation of the cold-responsive transcriptome and acquired freezing tolerance, although at present the signalling events that activate the ICE1 transcription factor during cold s...Continue Reading

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Mentioned in this Paper

Biochemical Pathway
Calcium [EPC]
SOS1 gene
Cross-talk
Mitogen-Activated Protein Kinases
Calcium
Genetic Analysis
Acclimatization
Genetic Screening Method
Complex (molecular entity)

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