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Title: Comprehensive analysis of rice DREB2-type genes that encode transcription factors involved in the expression of abiotic stress-responsive genes .
Author: Matsukura S Mizoi J Yoshida T Todaka D Ito Y Maruyama K Shinozaki K Yamaguchi-Shinozaki K
Journal: Mol Genet Genomics Citation: V : 283 P : 185-96 Year: 2010 Type: MEDLINE
Literature: oryza Field: abstract Doc ID: pub20049613 Accession (PMID): 20049613
Abstract: DREB2s ( dehydration-responsive element-binding protein 2s ) are transcription factors that interact with a cis-acting DRE ( dehydration-responsive element ) /CRT ( C-repeat ) sequence and activate the expression of downstream genes involved in water and heat-shock stress responses and tolerance in Arabidopsis thaliana . In this study , we performed a comprehensive analysis of all five DREB2-type genes in rice ( OsDREB2 s : OsDREB2A , OsDREB2B , OsDREB2C , OsDREB2E and OsABI4 ) to determine which of them contribute to plant stress responses . We analysed the expression patterns of these genes under abiotic stress conditions , and we examined the subcellular localisation and transcriptional activation activity of their translational products in protoplasts . Only OsDREB2A and OsDREB2B showed abiotic stress-inducible gene expression . In addition , OsDREB2B showed nuclear specific localisation and the highest transactivation activity . OsDREB2B has functional and non-functional forms of its transcript similar to its orthologues in the grass family , and the functional form of its transcript was markedly increased during stress conditions . We analysed the splicing mechanism of OsDREB2B with transgenic rice that express the non-functional transcript and we found that the non-functional form is not a precursor of the functional form ; thus , stress-inducible alternative splicing of pre-mRNA is an important mechanism for the regulation of OsDREB2B . Transgenic Arabidopsis plants overexpressing OsDREB2B showed enhanced expression of DREB2A target genes and improved drought and heat-shock stress tolerance . These results suggest that OsDREB2B is a key gene that encodes a stress-inducible DREB2-type transcription factor that functions in stress-responsive gene expression in rice .
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[ Sen. 8, subscore: 1.00 ]: Transgenic Arabidopsis plants overexpressing OsDREB2B showed enhanced expression of DREB2A target genes and improved drought and heat-shock stress tolerance .
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Title: Cloning and characterization of a maize SnRK2 protein kinase gene confers enhanced salt tolerance in transgenic Arabidopsis .
Author: Ying S Zhang DF Li HY Liu YH Shi YS Song YC Wang TY Li Y
Journal: Plant Cell Rep Citation: V : 30 P : 1683-99 Year: 2011 Type: MEDLINE
Literature: oryza Field: abstract Doc ID: pub21638061 Accession (PMID): 21638061
Abstract: SnRK2 ( sucrose non-fermenting 1-related protein kinases 2 ) represents a unique family of protein kinase in regulating signaling transduction in plants . Although the regulatory mechanisms of SnRK2 have been well demonstrated in Arabidopsis thaliana , their functions in maize are still unknown . In our study , we cloned an SnRK2 gene from maize , ZmSAPK8 , which encoded a putative homolog of the rice SAPK8 protein . ZmSAPK8 had two copies in the maize genome and harbored eight introns in its coding region . We demonstrated that ZmSAPK8 expressed differentially in various organs of maize plants and was up-regulated by high-salinity and drought treatment . A green fluorescent protein ( GFP ) -tagged ZmSAPK8 showed subcellular localization in the cell membrane , cytoplasm and nucleus . In vitro kinase assays indicated that ZmSAPK8 preferred Mn ( 2+ ) to Mg ( 2+ ) as cofactor for phosphorylation , and Ser-182 and Thr-183 in activation loop was important for its activity . Heterologous overexpression of ZmSAPK8 in Arabidopsis could significantly strengthen tolerance to salt stress . Under salt treatment , ZmSAPK8-overexpressed transgenic plants exhibited higher germination rate and proline content , low electrolyte leakage and higher survival rate than wild type . Further analysis indicated that transgenic plants showed increased transcription of the stress-related genes , RD29A , RD29B , RAB18 , ABI1 , DREB2A and P5CS1 , under high-salinity conditions . The results demonstrated that ZmSAPK8 was involved in diverse stress signal transduction . Moreover , no obvious adverse effects on growth and development in the ZmSAPK8-overexpressed transgenic plants implied that ZmSAPK8 was potentially useful in transgenic breeding to improve salt tolerance in crops .
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[ Sen. 10, subscore: 1.00 ]: Further analysis indicated that transgenic plants showed increased transcription of the stress-related genes , RD29A , RD29B , RAB18 , ABI1 , DREB2A and P5CS1 , under high-salinity conditions .
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