Molecular genetic characterization of rice seed lipoxygenase 3 and assessment of its effects on seed longevity

文献类型： 外文期刊

第一作者： Long, Qizhang

作者： Long, Qizhang;Zhang, Wenwei;Wang, Peng;Shen, Wenbiao;Zhou, Tong;Liu, Nannan;Wang, Ren;Jiang, Ling;Huang, Jiexue;Wang, Yihua;Liu, Yuqiang;Wan, Jianmin;Wan, Jianmin

作者机构：

关键词： Cloning;Lipoxygenase;Prokaryotic expression;Seed longevity;Subcellular localization

期刊名称：JOURNAL OF PLANT BIOLOGY （ 影响因子：2.434； 五年影响因子：2.455 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Lipoxygenases (LOXs) are enzymes involved in lipid peroxidation. Here we reported the identification, molecular and functional characterization of the gene encoding rice (Oryza sativa L.) seed LOX3 (sLOX3). Via a map-based cloning strategy we identified Os03g0700400 as the candidate gene encoding sLOX3. Further functional complementary test and biochemical characterization of the recombinant Os03g0700400 protein verified the identification. The sLOX3 gene was highly expressed in roots, moderately in embryos and very weakly in leaves, leaf sheaths and stems. Transient expression experiment (in rice protoplasts) and subsequent laser confocal microscopic analysis demonstrated that the sLOX3 protein was localized into the cytosol. We next showed that overexpression of sLOX3 in a japonica sLOX3-normal rice cultivar, Wuyunjing 7 accelerated the decrease of seed germination ability when the seeds were routinely stored, which demonstrated that sLOX3 had a negative effect on seed longevity (storability). Meanwhile, an increased occurrence of embryo decay was observed in the same transgenic seeds, suggesting that sLOX3 might negatively affect seed longevity by facilitating colonization of particular seed pathogens. Our result forwarded the understanding of the effects of 9-LOX on rice seed longevity.

分类号： Q94

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