文献类型： 外文期刊

作者： Fan, Kangjun ¹ ; Qin, Yonghua ¹ ; Hu, Xueli ² ; Xu, Jindong ¹ ; Ye, Qingzhi ¹ ; Zhang, Chengyang ¹ ; Ding, Yangyang ¹ ; Li, Gang ¹ ; Chen, Yan ¹ ; Liu, Jiao ¹ ; Wang, Peiqi ² ; Hu, Zunhong ² ; Yan, Xingchu ³ ; Xiong, Hairong ¹ ; Liu, Hong ¹ ; Qin, Rui ¹ ;

作者机构： 1.South Cent MinZu Univ, Coll Life Sci, Hubei Prov Key Lab Protect & Applicat Special Plan, Wuhan 430074, Peoples R China

2.Yunnan Acad Agr Sci, Ind Crop Res Inst, Kunming 650205, Peoples R China

3.Chinese Acad Agr Sci CAAS, Oil Crops Res Inst, Wuhan, Peoples R China

关键词： Carthamus tinctorius L.; Genetic Diversity; Fatty acid composition; Transcriptome sequencing; Fatty acid biosynthesis

期刊名称：BMC GENOMICS （ 影响因子：4.4； 五年影响因子：4.7 ）

ISSN： 1471-2164

年卷期： 2023 年 24 卷 1 期

页码：

收录情况： SCI

摘要： Background Safflower (Carthamus tinctorius L.) is an oilseed crop with substantial medicinal and economic value. However, the methods for constructing safflower core germplasm resources are limited, and the molecular mechanisms of lipid biosynthesis in safflower seeds are not well understood.Results In this study, 11 oil-related quantitative traits and 50 pairs of InDel markers were used to assess the diversity of a collection of 605 safflower germplasms. The original safflower germplasm exhibited rich phenotypic diversity, with high variation for most of the phenotypic traits under investigation. Similarly, high genetic diversity was evaluated in the original germplasm, in which the mean Shannon's information index (I), observed heterozygosity (H0), and expected heterozygosity (He) were 0.553, 0.182, and 0.374, respectively. Four subgroups with strong genetic structures were identified and a core germplasm of 214 cultivars was constructed, which is well represented in the original germplasm. Meanwhile, differential expression analysis of the transcriptomes of high and low linoleic acid safflower varieties at two stages of seed development identified a total of 47 genes associated with lipid biosynthesis. High expression of the genes KAS II and SAD enhanced the synthesis and accumulation of oleic acid, while FAD genes like FAD2 (Chr8G0104100), FAD3, FAD7 and FAD8 promoted the consumption of oleic acid conversion. The coordinated regulation of these multiple genes ensures the high accumulation of oleic acid in safflower seed oil.Conclusions Based on these findings, a core germplasm of 214 cultivars was constructed and 47 candidate genes related to unsaturated fatty acid biosynthesis and lipid accumulation were identified. These results not only provide guidance for further studies to elucidate the molecular basis of oil lipid accumulation in safflower seeds, but also contribute to safflower cultivar improvements.