Detection of allelic variation at the Wx locus with single-segment substitution lines in rice (Oryza sativa L.)

文献类型： 外文期刊

第一作者： Teng, Bin

作者： Teng, Bin;Zeng, Ruizhen;Wang, Yicun;Liu, Ziqiang;Zhang, Zemin;Zhu, Haitao;Ding, Xiaohua;Li, Wentao;Zhang, Guiquan;Teng, Bin;Zeng, Ruizhen;Liu, Ziqiang;Zhang, Zemin;Zhang, Guiquan

作者机构：

关键词： Waxy gene;Allelic variation;Single-segment substitution line;Apparent amylose content;Rice

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

ISSN： 1380-3743

年卷期： 2012 年 30 卷 1 期

页码：

收录情况： SCI

摘要： Apparent amylose content (AAC) is a key determinant of eating and cooking quality in rice and it is mainly controlled by the Wx gene which encodes a granule-bound starch synthase (GBSS). In this study, sixteen single-segment substitution lines harboring the Wx gene from 16 different donors and their recipient HJX74 were used to detect the naturally occurring allelic variation at the Wx locus. The AAC in the materials varied widely and could be grouped into glutinous, low, intermediate, and two high AAC sub-classes, high I (24.36-25.20%) and high II (25.81-26.19%), under different experimental environments, which showed a positive correlation with the enzymatic activity of GBSS. One insertion/deletion (InDel) and three single nucleotide polymorphisms in the Wx gene were detected and their combinations resulted in the variation of five classes of AAC. Based on the results of AAC phenotypes, GBSS activities and cDNA sequences, five Wx alleles, wx, Wx (t), Wx (g1), Wx (g2), and Wx (g3), were identified, two of which, Wx (g2) and Wx (g3), are separated for the first time in this study. Under different cropping seasons, the AAC differed significantly for the Wx (t) and Wx (g1) alleles, with higher AAC in the fall season than in the spring season, but did not differ significantly for the wx, Wx (g2), and Wx (g3) alleles. In conclusion, the present results might contribute to our understanding of the naturally occurring allelic variation at the Wx locus and will facilitate the improvement of rice quality by marker-assisted selection.

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