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Natural Variations in SLG7 Regulate Grain Shape in Rice

文献类型： 外文期刊

作者： Zhou, Yong 1 ; Miao, Jun 1 ; Gu, Haiyong; Peng, Xiurong 1 ; Leburu, Mamotshewa 1 ; Yuan, Fuhai 1 ; Gu, Houwen 1 ; Gao, 1 ;

作者机构： 1.Yangzhou Univ, Minist Educ, Jiangsu Key Lab Crop Genet & Physiol, Coinnovat Ctr Modern Prod Technol Grain Crops,Key, Yangzhou 225009, Jiangsu, Peoples R China

2.Yangzhou Univ, Minist Educ, Jiangsu Key Lab Crop Genet & Physiol

关键词： rice;quantitative trait loci;grain shape;cell elongation

期刊名称：GENETICS （ 影响因子：4.562； 五年影响因子：4.845 ）

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收录情况： SCI

摘要： Rice (Oryza sativa) grain shape, which is controlled by quantitative trait loci (QTL), has a strong effect on yield production and quality. However, the molecular basis for grain development remains largely unknown. In this study, we identified a novel QTL, Slender grain on chromosome 7 (SLG7), that is responsible for grain shape, using backcross introgression lines derived from 9311 and Azucena. The SLG7 allele from Azucena produces longer and thinner grains, although it has no influence on grain weight and yield production. SLG7 encodes a protein homologous to LONGIFOLIA 1 and LONGIFOLIA 2, both of which increase organ length in Arabidopsis. SLG7 is constitutively expressed in various tissues in rice, and the SLG7 protein is located in plasma membrane. Morphological and cellular analyses suggested that SLG7 produces slender grains by longitudinally increasing cell length, while transversely decreasing cell width, which is independent from cell division. Our findings show that the functions of SLG7 family members are conserved across monocots and dicots and that the SLG7 allele could be applied in breeding to modify rice grain appearance.

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