Two calcium-dependent protein kinases, CPK4 and CPK11, regulate abscisic acid signal transduction in Arabidopsis.

Two calcium-dependent protein kinases, CPK4 and CPK11, regulate abscisic acid signal transduction in Arabidopsis. Research Abstract Details 

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Two calcium-dependent protein kinases, CPK4 and CPK11, regulate abscisic acid signal transduction in Arabidopsis. Abstract Text:

Sai-Yong Zhu,Xiang-Chun Yu,Xiao-Jing Wang,Rui Zhao,Yan Li,Ren-Chun Fan,Yi Shang,Shu-Yuan Du,Xiao-Fang Wang,Fu-Qing Wu,Yan-Hong Xu,Xiao-Yan Zhang,Da-Peng Zhang,Sai-Yong Zhu,Xiang-Chun Yu,Xiao-Jing Wang,Rui Zhao,Yan Li,Ren-Chun Fan,Yi Shang,Shu-Yuan Du,Xiao-Fang Wang,Fu-Qing Wu,Yan-Hong Xu,Xiao-Yan Zhang,Da-Peng Zhang,

Many biochemical approaches show functions of calcium-dependent protein kinases (CDPKs) in abscisic acid (ABA) signal transduction, but molecular genetic evidence linking defined CDPK genes with ABA-regulated biological functions at the whole-plant level has been lacking. Here, we report that ABA stimulated two homologous CDPKs in Arabidopsis thaliana, CPK4 and CPK11. Loss-of-function mutations of CPK4 and CPK11 resulted in pleiotropic ABA-insensitive phenotypes in seed germination, seedling growth, and stomatal movement and led to salt insensitivity in seed germination and decreased tolerance of seedlings to salt stress. Double mutants of the two CDPK genes had stronger ABA- and salt-responsive phenotypes than the single mutants. CPK4- or CPK11-overexpressing plants generally showed inverse ABA-related phenotypes relative to those of the loss-of-function mutants. Expression levels of many ABA-responsive genes were altered in the loss-of-function mutants and overexpression lines. The CPK4 and CPK11 kinases both phosphorylated two ABA-responsive transcription factors, ABF1 and ABF4, in vitro, suggesting that the two kinases may regulate ABA signaling through these transcription factors. These data provide in planta genetic evidence for the involvement of CDPK/calcium in ABA signaling at the whole-plant level and show that CPK4 and CPK11 are two important positive regulators in CDPK/calcium-mediated ABA signaling pathways.

Two calcium-dependent protein kinases, CPK4 and CPK11, regulate abscisic acid signal transduction in Arabidopsis. Publishing Authors By Initials

SY Zhu,XC Yu,XJ Wang,R Zhao,Y Li,RC Fan,Y Shang,SY Du,XF Wang,FQ Wu,YH Xu,XY Zhang,DP Zhang,SY Zhu,XC Yu,XJ Wang,R Zhao,Y Li,RC Fan,Y Shang,SY Du,XF Wang,FQ Wu,YH Xu,XY Zhang,DP Zhang,

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Two calcium-dependent protein kinases, CPK4 and CPK11, regulate abscisic acid signal transduction in Arabidopsis. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The Plant cell

VOLUME: 19

Page Numbers: 3019-36

Journal Abbreviation: Plant Cell

ISSN: 1040-4651

DAY: 5

MONTH: 10

YEAR: 2007

Two calcium-dependent protein kinases, CPK4 and CPK11, regulate abscisic acid signal transduction in Arabidopsis. Information

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LANGUAGE: eng

NlmUniqueID: 9208688

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Grant and Affiliation Information for Two calcium-dependent protein kinases, CPK4 and CPK11, regulate abscisic acid signal transduction in Arabidopsis.

AFFILIATION: China State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, 100094 Beijing, China.

Country: United States

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MEDLINETA: Plant Cell

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