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Genome-wide association study identifies QTL for girth and dry rubber yield in a progeny population of Whickham Hevea germplasms

文献类型： 外文期刊

作者： Liang, Cuili 1 ; Zhang, Yuanyuan 1 ; Liu, Xing 1 ; Tan, Yingchao 1 ; Xu, Tiancheng 1 ; Zheng, Cheng 1 ; Zhang, Shengmin 1 ; Qi, Jiyan 1 ; Liu, Xiaodong 5 ; Zeng, Xia 5 ; Luo, Hongli 2 ; Li, Zhonghua 1 ; Liu, Hui 1 ; Cao, Jie 1 ; Liu, Kaiye 1 ; Tang, Chaorong 1 ;

作者机构： 1.Hainan Univ, Sanya Inst Breeding & Multiplicat, Coll Breeding & Multiplicat, Natl Key Lab Trop Crop Breeding, Sanya 572025, Peoples R China

2.Hainan Univ, Sch Trop Agr & Forestry, Haikou 570228, Peoples R China

3.Hainan Univ, Nat Rubber Cooperat Innovat Ctr Hainan Prov, Haikou 570228, Peoples R China

4.Hainan Univ, Minist Educ PRC, Haikou 570228, Peoples R China

5.Chinese Acad Trop Agr Sci CATAS, Rubber Res Inst, Danzhou 571737, Hainan, Peoples R China

关键词： Rubber tree; GWAS; Girth; Dry rubber yield; Candidate genes

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：5.9； 五年影响因子：6.0 ）

ISSN： 0926-6690

年卷期： 2024 年 216 卷

页码：

收录情况： SCI

摘要： The cultivation of elite latex-timber clones that exhibit both enhanced NR and wood production has become a key objective in current Hevea brasiliensis breeding programs. The girth and dry rubber yield (DRY) are two crucial indicators for evaluating the latex-timber characteristics of Hevea trees. However, the quantitative trait locus (QTL) and candidate genes identified for these traits are still limited. Here, a genome-wide association study (GWAS) was performed in a Whickham germplasm offspring to identify genetic variants associated with girth and DRY. Girth and DRY phenotypes were measured for three consecutive years. Meanwhile, a total of 7835,736 high-confidence SNPs were identified from 218 Hevea accessions. Remarkably, the population exhibited a high level of genetic diversity, coupled with a rapid decline in linkage disequilibrium, and was roughly grouped into three subgroups by population structure analysis. A total of 17 and 76 SNPs, respectively, correlated significantly with girth DRY, and corresponded to 31 and 284candidate genes for girth and DRY. To further assess the candidates, gene expression analyses were performed separately on four types of Hevea tree tissues and two distinct groups exhibiting notable girth or DRY phenotypic differences. Eventually, a cullin protein and an iridoid oxidase protein were identified as prospective girth regulators, whereas two chloroplast thylakoid membrane proteins and an auxin-repressed protein were implicated in shaping the performance of DRY. These findings contribute to a deeper understanding of the genetic foundations of girth and DRY, as well as molecular-assisted breeding of latex-timber rubber clones.

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