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ARS Home Plains Area Lubbock, Texas Cropping Systems Research Laboratory Plant Stress and Germplasm Development Research Research Publications at this Location





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Title:   Author  item
                                            Xin, Zhanguoitem
                                            Chen, Junpingitem
                                            MANDAOKAR, AJIN - WSUitem
                                            LAST, ROBERT - WSUitem
                                            BROWSE, JOHN - WSU
  Submitted to: Plant Biology Annual Meeting
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/16/2005
                                    Publication  Date: 7/21/2005
                                    Citation: Xin, Z., Chen, J., Mandaokar, A., Last, R., Browse, J. 2005. Esk1 encodes a novel regulator of freezing tolerance[abstract]. American Society of Plant Biology. Paper No. 31001.Interpretive Summary:
                                Technical Abstract: Many temperate plants acquire an increased freezing tolerance in response to a period of low nonfreezing temperatures through an adaptive process known as cold acclimation. Like many other temperate plants, Arabidopsis improves its freezing tolerance from -5 to -12C after 2d acclimation at 4C. To study the mechanisms of cold acclimation, we have carried out a genetic screen to isolate constitutively freezing tolerant mutants that bypass the requirement for a prior exposure to low nonfreezing temperatures. A constitutively freezing tolerant mutant, esk1, could survive -10C in the absence of cold acclimation. Transcriptome analysis in a missense allele and a knockout allele of the esk1 mutants revealed that 169 genes were up-regulated and 137 genes were down-regulated for two-fold or more in the esk1 mutants. The ESK1-mediated genes overlapped with that induced by cold acclimation and ABA treatment. Some were also regulated by overexpressing CBF/DREB transcription factors at warm temperatures. Positional cloning of ESK1 gene uncovered a large family of plant-specific proteins whose function has not been characterized previously. The recessive nature of esk1 mutations and the wide-spectrum of genes altered in the mutants suggest that the ESK1 protein may be a novel negative regulator of cold acclimation.


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