Moderate Salinity Stress Reduces Rice Grain Yield by Influencing Expression of Grain Number- and Grain Filling-Associated Genes

文献类型： 外文期刊

第一作者： Zheng, Chongke

作者： Zheng, Chongke;Zhou, Guanhua;Zhang, Zhizhen;Li, Wen;Peng, Yongbin;Xie, Xianzhi;Zhang, Zhizhen

作者机构：

关键词： Rice; Salinity; Grain number; Grain weight; Yield-associated gene

期刊名称：JOURNAL OF PLANT GROWTH REGULATION （ 影响因子：4.169； 五年影响因子：4.038 ）

ISSN： 0721-7595

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收录情况： SCI

摘要： Soil salinity is an environmental stress severely impacting on rice grain yield. However, limited information is available on how salinity affects expression levels of genes determining grain yield. In this study, we investigated agronomic traits associated with grain yield among threejaponicarice cultivars grown either under moderate salinity with an electrical conductivity of 4 dS/m or under non-saline conditions in a paddy field in Dongying, Shandong, China. Moderate salinity affected rice yield predominantly by reducing grain number and grain filling. We compared expression levels of genes determining grain number in young panicles (0.5-1 cm in length) of plants grown under salinity or non-saline conditions. Transcription ofLax panicle 1,Lax panicle 2,Ideal plant architecture(IPA1),Dense and erect panicle 1,Tawawa 1, andOsMADS1was significantly repressed, whereas that ofCytokinin oxidase/dehydrogenase,Grain number per panicle 1, andNarrow leaf 1was not significantly influenced by salinity. OsmicroRNA156, the posttranscriptional regulator ofIPA1, was induced by salinity in the panicle and seedlings and complemented the expression patterns ofIPA1. This result implied that the OsmicroRNA156-IPA1 pathway was involved in rice salinity responses. The grain filling-associated genesGrain incomplete filling 1,Grain incomplete filling 2, andNuclear factor Ywere down-regulated by salinity in the spikelet at 5 or 10 days after fertilization, which contributed to the salinity-triggered reduction in grain weight. These findings suggest some targets that may be utilized to improve the grain yield under salinity stress conditions via breeding and gene-pyramiding approaches.

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[1]Moderate Salinity Stress Reduces Rice Grain Yield by Influencing Expression of Grain Number- and Grain Filling-Associated Genes. Zheng, Chongke,Zhou, Guanhua,Zhang, Zhizhen,Li, Wen,Peng, Yongbin,Xie, Xianzhi,Zhang, Zhizhen.

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