Allelic Diversification of the Wx and ALK Loci in Indica Restorer Lines and Their Utilisation in Hybrid Rice Breeding in China over the Last 50 Years

文献类型： 外文期刊

第一作者： Pan, Li-Xu

作者： Pan, Li-Xu;Zhang, Chang-Quan;Li, Bu;Yang, Qing-Qing;Chen, Fei;Fan, Xiao-Lei;Zhao, Dong-Sheng;Liu, Qiao-Quan;Sun, Zhi-Zhong;Lv, Qi-Ming;Yuan, Ding-Yang;Zhang, Chang-Quan;Fan, Xiao-Lei;Zhao, Dong-Sheng;Liu, Qiao-Quan

作者机构：

关键词： Oryza sativa L; hybrid rice; ECQ; Waxy; ALK; indica restorer; rice breeding

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）

ISSN：

年卷期： 2022 年 23 卷 11 期

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收录情况： SCI

摘要： Hybrid rice technology has been used for more than 50 years, and eating and cooking quality (ECQ) has been a major focus throughout this period. Waxy (Wx) and alkaline denaturation (ALK) genes have received attention owing to their pivotal roles in determining rice characteristics. However, despite significant effort, the ECQ of restorer lines (RLs) has changed very little. By contrast, obvious changes have been seen in inbred rice varieties (IRVs), and the ECQ of IRVs is influenced by Wx, which reduces the proportion of Wx(a) and increases the proportion of Wx(b), leading to a decrease in amylose content (AC) and an increase in ECQ. Meanwhile, ALK is not selected in the same way. We investigated Wx alleles and AC values of sterile lines of female parents with the main mating combinations in widely used areas. The results show that almost all sterile lines were Wx(a)-type with a high AC, which may explain the low ECQ of hybrid rice. Analysis of hybrid rice varieties and RLs in the last 5 years revealed serious homogenisation among hybrid rice varieties.

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