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National Chung Hsing University Institutional Repository - NCHUIR > 學術研究中心 > 生物科技發展中心 > 依資料類型分類 > 期刊論文 >  Unique Drought Resistance Functions of the Highly ABA-Induced Clade A Protein Phosphatase 2Cs

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標題: Unique Drought Resistance Functions of the Highly ABA-Induced Clade A Protein Phosphatase 2Cs
作者: Bhaskara, Govinal Badiger;Nguyen, Thao Thi;Paul, E.Verslues
Contributors: Wei Chun Wang
日期: 2012-07
Issue Date: 2013-07-02 10:46:31 (UTC+8)
摘要: Six Arabidopsis (Arabidopsis thaliana) clade A protein phosphatase 2Cs (PP2Cs) have established abscisic acid (ABA) signaling
roles; however, phenotypic roles of the remaining three “HAI” PP2Cs, Highly ABA-Induced1 (HAI1), AKT1-Interacting PP2C1/
HAI2, and HAI3, have remained unclear. HAI PP2C mutants had enhanced proline and osmoregulatory solute accumulation at
low water potential, while mutants of other clade A PP2Cs had no or lesser effect on these drought resistance traits. hai1-2 also
had increased expression of abiotic stress-associated genes, including dehydrins and late embryogenesis abundant proteins, but
decreased expression of several defense-related genes. Conversely, the HAI PP2Cs had relatively less impact on several ABA
sensitivity phenotypes. HAI PP2C single mutants were unaffected in ABA sensitivity, while double and triple mutants were
moderately hypersensitive in postgermination ABA response but ABA insensitive in germination. The HAI PP2Cs interacted
most strongly with PYL5 and PYL7 to -10 of the PYL/RCAR ABA receptor family, with PYL7 to -10 interactions being relatively
little affected by ABA in yeast two-hybrid assays. HAI1 had especially limited PYL interaction. Reduced expression of the main
HAI1-interacting PYLs at low water potential when HAI1 expression was strongly induced also suggests limited PYL regulation
and a role of HAI1 activity in negatively regulating specific drought resistance phenotypes. Overall, the HAI PP2Cs had greatest
effect on ABA-independent low water potential phenotypes and lesser effect on classical ABA sensitivity phenotypes. Both this
and their distinct PYL interaction demonstrate a new level of functional differentiation among the clade A PP2Cs and a point of
cross talk between ABA-dependent and ABA-independent drought-associated signaling.
Relation: Plant Physiology, Volume 160, Page(s) 379-395.
Appears in Collections:[依資料類型分類] 期刊論文

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