Chinese Journal OF Rice Science >
Identification and QTL Mapping of Rice Germplasm Resources with Low Amylose Content
Received date: 2022-11-19
Revised date: 2023-02-23
Online published: 2023-11-14
【Objective】 Amylose content (AC) is one of the most critical factors that determine the eating and cooking quality (ECQ) of rice. Therefore, it holds great significance to screen rice germplasm resources with low amylose content and elucidate the genetic control mechanism for breeding new varieties with excellent ECQ. 【Method】 We determined AC in 22 restorer lines of three-line hybrid rice and analyzed the QTL locus controlling amylose content using a double haploid (DH) population derived from the cross between Fan 38 and Shenhui 26. 【Result】 Two rice germplasms with low AC, Fan 32 and Fan 38, were discovered among the 22 restorer lines. Their AC was found to be 11.39%±0.01% and 10.58%±0.13%, respectively. In contrast to other low AC varieties carrying Wxmp alleles, Fan 32 and Fan 38 carried Wxb alleles. A total of five QTLs, namely qAC1.1, qAC1.2, qAC5, qAC6.1, and qAC6.2, related to amylose content, were identified in the DH population. Among these, qAC6.1 and qAC6.2 were consistently detectable over two years. qAC6.2 emerged as a major QTL, contributing to over 30% of the phenotypic variation. 【Conclusion】 These findings suggest that the low AC in Fan 38 is likely primarily controlled by the qAC6.2 locus. This establishes a foundation for further research into the regulatory mechanism of amylose synthesis in rice and for the development of new rice varieties with low AC using marker-assisted selection technology.
Key words： rice; eating and cooking quality; low amylose; Wx; QTL
XIE Kaizhen, ZHANG Jianming, CHENG Can, ZHOU Jihua, NIU Fuan, SUN Bin, ZHANG Anpeng, WEN Weijun, DAI Yuting, HU Qiyan, QIU Yue, CAO Liming, CHU Huangwei . Identification and QTL Mapping of Rice Germplasm Resources with Low Amylose Content[J]. Chinese Journal OF Rice Science, 2023 , 37(6) : 609 -616 . DOI: 10.16819/j.1001-7216.2023.221109
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