Genetic dissection of lint yield and fiber quality traits of G. hirsutum in G. barbadense background
Genetic dissection of lint yield and fiber quality traits of G. hirsutum in G. barbadense background
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海岛棉背景下陆地棉皮棉产量和纤维品质性状的遗传解析
DOI：
10.1007/s11032-016-0607-3
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发表时间：
2017-01-01
影响因子：
3.1
通讯作者：
Zhang, Tianzhen
中科院分区：
文献类型：
--
作者：
Si, Zhanfeng;Chen, Hong;Zhang, Tianzhen
陆地棉是一种广泛栽培的植物，具有产量高、环境适应性广等特点，而海岛棉则以纤维品质优良著称。本研究首次建立了海岛棉遗传背景下的陆地棉染色体片段导入系(GhILs_GB)，并对海岛棉皮棉产量和纤维品质的遗传进行了分析。GhILS_GB含有跨度为4121.20 cM的导入片段，占四倍体棉花基因组的82.20%，平均长度为18.65 cM。在新疆种植的白粉菌群体中，共检测到6个性状的39个数量性状基因座(QTL)。共检测到4个QTL簇。其中，对纤维长度、强度和铃重有不良影响的有3个，对Chr有影响的只有1个。D9可用于标记辅助选择(MAS)，提高棉花衣分，降低马克隆值。QTL定位表明，除马克隆值外，大多数与产量相关的QTL对海岛棉具有正向效应，对皮棉产量有促进作用，而与纤维品质相关的QTL大多对皮棉有不良影响。这表明陆地棉具有较高的皮棉产量。在GhILs_GB的基础上，通过导入1个陆地棉基因片段，育成了多个改良海岛棉衣分和铃重的品系。这些分析结果将加深对陆地棉皮棉产量和纤维品质遗传的理解，并有助于进一步开展分子育种以提高海岛棉皮棉产量。
Gossypium hirsutum L. is a widely cultivated species characterized by its high yield and wide environmental adaptability, while Gossypium barbadense is well known for its superior fiber quality. In the present report, we, for the first time, developed G. hirsutum chromosome segment introgression lines (ILs) in a G. barbadense background (GhILs_Gb) and genetically dissected the inheritance of lint yield and fiber quality of G. hirsutum in G. barbadense background. The GhILs_Gb contains introgressed segments spanning 4121.20 cM, which represents 82.20% of the tetraploid cotton genome, with an average length of 18.65 cM. A total of 39 quantitative trait loci (QTLs) for six traits are identified in this IL population planted in Xinjiang. Four QTL clusters are detected. Of them, however, three clusters have deleterious effects on fiber length and strength and boll weight, and only one cluster on Chr. D9 can be used in marker-assisted selection (MAS) to increase lint percentage and decrease micronaire value in G. barbadense. QTL mapping showed that most of yield-related QTLs detected have positive effects and increase lint yield in G. barbadense, while most of fiber quality-related QTLs have deleterious effects except for micronaire. It suggested that G. hirsutum evolved to have a high lint yield. Several lines improved in lint percentage and boll size in G. barbadense by introgressed one fragment of G. hirsutum have been developed from the GhILs_Gb. The ILs developed, and the analyses presented here will enhance the understanding of the genetics of lint yield and fiber quality in G. hirsutum and facilitate further molecular breeding to improve lint yield in G. barbadense.