Overexpression of Arabidopsis XERICO gene confers enhanced drought and salt stress tolerance in rice (Oryza Sativa L.)

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• 作者：De-Er Zeng (1)
  Pei Hou (1)
  Fangming Xiao (2)
  Yongsheng Liu (1) (3)
  
  1. Ministry of Education Key Laboratory for Bio-resource and Eco-environment ; College of Life Science ; State Key Laboratory of Hydraulics and Mountain River Engineering ; Sichuan University ; Chengdu ; 610064 ; People鈥檚 Republic of China
  2. Department of Plant ; Soil and Entomological Sciences ; University of Idaho ; Moscow ; ID ; 83844-2339 ; USA
  3. College of Agricultural and Life Sciences ; Chongqing University ; Chongqing ; 400030 ; China
  
• 关键词：RING ; H2 ; Abscisic acid ; Drought stress ; Salt stress ; Tolerance ; Rice
• 刊名：Journal of Plant Biochemistry and Biotechnology
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：24
• 期：1
• 页码：56-64
• 全文大小：2,541 KB
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• 刊物主题：Life Sciences, general; Plant Biochemistry; Protein Science; Receptors; Cell Biology;
• 出版者：Springer India
• ISSN：0974-1275

文摘

Drought and salinity are two major limiting factors in rice (Oryza. sativa L.) productivity worldwide. XERICO, encoding a RING-H2 zinc finger protein, substantially enhanced drought tolerance by increasing ABA biosynthesis in Arabidopsis. Here, we report the isolation of the full-length cDNA of XERICO from Arabidopsis and its heterologous expression in rice (O. sativa L.). Homozygous transgenic plants overexpressing XERICO (OE-XERICO) exhibited hypersensitivity to stress stimuli (salt, osmotic stress and exogenous ABA) during seed germination and early seedling growth. When subjected to dehydration and salinity stress, 4-week-old transgenic seedlings showed a considerable increase in tolerance to these stimuli compared with that of the wild type (WT) seedlings. Detached leaves from the transgenic rice lines showed lower transpirational water loss than WT. The OE-XERICO lines exhibited a significant increase in endogenous ABA contents, and expression levels of Four ABA biosynthesis or ABA-response genes, OsNCED, OsABA3, OsABI5, OsLEA3-1, under drought and salt stress condition. These results suggest that the overexpression of XERICO in rice plants confers improved drought and salt tolerance probably through enhanced ABA level and ABA-mediated stress response.