GWAS combined with QTL mapping reveals the genetic loci of leaf morphological characters in Nicotiana tabacum
文献类型： 外文期刊
作者： Ji, Yan 1 ; Liu, Guoxiang 1 ; Yan, Sifan 2 ; Jiang, Xun 1 ; Wu, Mengting 1 ; Liu, Wei 5 ; Li, Yuan 1 ; Yang, Aiguo 1 ; Dai, Peigang 1 ; Du, Shuaibin 1 ; Li, Yangyang 4 ; Wang, Jun 3 ; Zhang, Xingwei 1 ;
作者机构： 1.Chinese Acad Agr Sci, Tobacco Res Inst, CN-266000 Qingdao, Peoples R China
2.Jiangxi Ganzhou Tobacco Co China Tobacco Corp, Ruijin Branch, CN-341000 Ganzhou, Peoples R China
3.Deyang Co, Sichuan Prov Tobacco Corp, CN-618400 Deyang, Peoples R China
4.Hunan Tobacco Res Inst, Changsha 410004, Hunan, Peoples R China
5.Sichuan Univ, Coll Life Sci, Minist Educ, Key Lab Bioresource & Ecoenvironm, CN-610065 Chengdu, Peoples R China
关键词： Cigar tobacco; Leaf morphological traits; QTL mapping; GWAS
期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.3； 五年影响因子：5.2 ）
ISSN： 1471-2229
年卷期： 2024 年 24 卷 1 期
页码：
收录情况： SCI
摘要： Background Leaf morphology plays a crucial role in photosynthetic efficiency and yield potential in crops. Cigar tobacco plants, which are derived from common tobacco (Nicotiana tabacum L.), possess special leaf characteristics including thin and delicate leaves with few visible veins, making it a good system for studying the genetic basis of leaf morphological characters. Results In this study, GWAS and QTL mapping were simultaneously performed using a natural population containing 185 accessions collected worldwide and an F-2 population consisting of 240 individuals, respectively. A total of 26 QTLs related to leaf morphological traits were mapped in the F2 population at three different developmental stages, and some QTL intervals were repeatedly detected for different traits and at different developmental stages. Among the 206 significant SNPs identified in the natural population using GWAS, several associated with the leaf thickness phenotype were co-mapped via QTL mapping. By analyzing linkage disequilibrium and transcriptome data from different tissues combined with gene functional annotations, 7 candidate genes from the co-mapped region were identified as the potential causative genes associated with leaf thickness. Conclusions These results presented a valuable cigar tobacco resource showing the genetic diversity regarding its leaf morphological traits at different developmental stages. It also provides valuable information for novel genes and molecular markers that will be useful for further functional verification and for molecular breeding of leaf morphological traits in crops in the future.
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