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Plos Biology : Cdpks Cpk6 and Cpk3 Function in Aba Regulation of Guard Cell S-type Anion- and CA2Þ- Permeable Channels and Stomatal Closure, Volume 4

By Carrington, James

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Book Id: WPLBN0003925338
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos Biology : Cdpks Cpk6 and Cpk3 Function in Aba Regulation of Guard Cell S-type Anion- and CA2Þ- Permeable Channels and Stomatal Closure, Volume 4  
Author: Carrington, James
Volume: Volume 4
Language: English
Subject: Journals, Science, Biology
Collections: Periodicals: Journal and Magazine Collection (Contemporary), PLoS Biology
Historic
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Publisher: Plos

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Carrington, J. (n.d.). Plos Biology : Cdpks Cpk6 and Cpk3 Function in Aba Regulation of Guard Cell S-type Anion- and CA2Þ- Permeable Channels and Stomatal Closure, Volume 4. Retrieved from http://netlibrary.net/


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Description : Abscisic acid (ABA) signal transduction has been proposed to utilize cytosolic Ca2þ in guard cell ion channel regulation. However, genetic mutants in Ca2þ sensors that impair guard cell or plant ion channel signaling responses have not been identified, and whether Ca2þ-independent ABA signaling mechanisms suffice for a full response remains unclear. Calcium-dependent protein kinases (CDPKs) have been proposed to contribute to central signal transduction responses in plants. However, no Arabidopsis CDPK gene disruption mutant phenotype has been reported to date, likely due to overlapping redundancies in CDPKs. Two Arabidopsis guard cell–expressed CDPK genes, CPK3 and CPK6, showed gene disruption phenotypes. ABA and Ca2þ activation of slow-type anion channels and, interestingly, ABA activation of plasma membrane Ca2þ-permeable channels were impaired in independent alleles of single and double cpk3cpk6 mutant guard cells. Furthermore, ABA- and Ca2þ-induced stomatal closing were partially impaired in these cpk3cpk6 mutant alleles. However, rapid-type anion channel current activity was not affected, consistent with the partial stomatal closing response in double mutants via a proposed branched signaling network. Imposed Ca2þ oscillation experiments revealed that Ca2þ-reactive stomatal closure was reduced in CDPK double mutant plants. However, longlasting Ca2þ-programmed stomatal closure was not impaired, providing genetic evidence for a functional separation of these two modes of Ca2þ-induced stomatal closing. Our findings show important functions of the CPK6 and CPK3 CDPKs in guard cell ion channel regulation and provide genetic evidence for calcium sensors that transduce stomatal

 

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