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Fine-mapping and candidate gene analysis of a major locus controlling leaf thickness in rice (Oryza sativa L.)

文献类型： 外文期刊

作者： Chen, Da-gang 1 ; Zhou, Xin-qiao 1 ; Chen, Ke 1 ; Chen, Ping-li 1 ; Guo, Jie 1 ; Liu, Chuan-guang 1 ; Chen, You-ding 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Rice Res Inst, Guangdong Rice Engn Lab, Guangdong Key Lab New Technol Rice Breeding, Guangzhou 510640, Peoples R China

关键词： Fine-mapping; Leaf thickness; BSA-seq; Oryza sativa

期刊名称：MOLECULAR BREEDING （ 影响因子：3.297； 五年影响因子：3.011 ）

ISSN： 1380-3743

年卷期： 2022 年 42 卷 2 期

页码：

收录情况： SCI

摘要： Leaf thickness is an important trait in rice (Oryza sativa L.). It affects both photosynthesis and sink-resource efficiency. However, compared to leaf length and length width, reports seldom focused on leaf thickness due to the complicated measurement and minor difference. To identify the quantitative trait loci (QTL) and explore the genetic mechanism regulating the natural variation of leaf thickness, we crossed a high leaf thickness variety Aixiuzhan (AXZ) to a thin leaf thickness variety Yangdao No.6 (YD 6) and evaluated 585 F-2 individuals. We further use bulked sergeant analysis with whole-genome resequencing (BSA-seq) to identify five genomic regions, including chromosomes 1, 6, 9, 10, and 12. These regions represented significant allele frequency differentiation between thick and thin leaf thickness among the mixed pool offspring. Moreover, we conducted a linkage mapping using 276 individuals derived from the F-2 population. We fine-mapped and confirmed that chromosome 9 contributed the primary explanation of phenotypic variance. We fine-mapped the candidate regions and confirmed that the chromosome 9 region contributed to flag leaf thickness in rice. We observed the virtual cellular slices and found that the bundle sheath cells in YD 6 flag leaf veins are fewer than AXZ. We analyzed the potential regions on chromosome 9 and narrowed the QTL candidate intervals in the 928-kb region. Candidate genes of this major QTL were listed as potentially controlled leaf thickness. These results provide promising evidence that cloning leaf thickness is associated with yield production in rice.

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