The role of tocopherol cyclase in salt stress tolerance of rice (Oryza sativa)

被引：0
作者：
ShouQiang Ouyang
SiJie He
Peng Liu
WanKe Zhang
JinSong Zhang
ShouYi Chen
机构：
[1] Chinese Academy of Sciences,State Key Laboratory of Plant Genomics and National Centre for Plant Gene Research (Beijing), Institute of Genetics and Developmental Biology
[2] Graduate School of the Chinese Academy of Sciences,undefined
来源：
Science China Life Sciences | 2011年 / 54卷
关键词：
rice; tocopherol; tocopherol cyclase (TC/VTE1); transgenic rice; abiotic stress tolerance;
D O I：
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中图分类号：
学科分类号：
摘要：
Tocopherols synthesized exclusively by photosynthetic organisms are major antioxidants in biomembranes. In plants, tocopherol cyclase (TC/VTE1) catalyzes the conversion of 2,3-dimethyl-5-phytyl-1,4-benzoquinone (DMPBQ) to γ-tocopherol. In the present study, OsVTE1, which encodes a rice tocopherol cyclase ortholog, was cloned and characterized. OsVTE1 was induced significantly by abiotic stresses such as high salt, H2O2, drought, cold and by the plant hormones ABA and salicylic acid. The tissue-specific expression pattern and OsVTE1-promoter GUS activity assay showed that OsVTE1 was mainly expressed in the leaf, and also could be detected in the root, stem and panicle. Compared with control plants, transgenic plants with Os-VTE1 RNA interference (OsVTE1-RNAi) were more sensitive to salt stress whereas, in contrast, transgenic plants overexpressing OsVTE1 (OsVTE1-OX) showed higher tolerance to salt stress. The DAB in vivo staining showed that OsVTE1-OX plants accumulated less H2O2 than did control plants.
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页码：181 / 188
页数：7
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