BEAK-SHAPED GRAIN 1/TRIANGULAR HULL 1, a DUF640 gene, is associated with grain shape, size and weight in rice

文献类型： 外文期刊

第一作者： Yan DaWei

作者： Yan DaWei;Zeng LongJun;He ZuHua;Zhou Ya;Ye ShengHai;Zhang XiaoMing

作者机构：

关键词： cell division and expansion;DUF640 protein;gene expression;grain size;lemma and palea

期刊名称：SCIENCE CHINA-LIFE SCIENCES （ 影响因子：6.038； 五年影响因子：4.754 ）

ISSN： 1674-7305

年卷期： 2013 年 56 卷 3 期

页码：

收录情况： SCI

摘要： Grain shape and size both determine grain weight and therefore crop yield. However, the molecular mechanisms controlling grain shape and size are still largely unknown. Here, we isolated a rice mutant, beak-shaped grain1 (bsg1), which produced beak-shaped grains of decreased width, thickness and weight with a loosely interlocked lemma and palea that were unable to close tightly. Starch granules were also irregularly packaged in the bsg1 grains. Consistent with the lemma and palea shapes, the outer parenchyma cell layers of these bsg1 tissues developed fewer cells with decreased size. Map-based cloning revealed that BSG1 encoded a DUF640 domain protein, TRIANGULAR HULL 1, of unknown function. Quantitative PCR and GUS fusion reporter assays showed that BSG1 was expressed mainly in the young panicle and elongating stem. The BSG1 mutation affected the expression of genes potentially involved in the cell cycle and GW2, an important regulator of grain size in rice. Our results suggest that BSG1 determines grain shape and size probably by modifying cell division and expansion in the grain hull.

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