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首页> 外文期刊>Theoretical and Applied Genetics: International Journal of Breeding Research and Cell Genetics >Mapping quantitative trait loci for lint yield and fiber quality across environments in a Gossypium hirsutum x Gossypium barbadense backcross inbred line population
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Mapping quantitative trait loci for lint yield and fiber quality across environments in a Gossypium hirsutum x Gossypium barbadense backcross inbred line population

机译：绘制陆地棉×巴巴达斯棉回交自交系群体中环境中皮棉产量和纤维质量的定量性状基因座图

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摘要

Identification of stable quantitative trait loci (QTLs) across different environments and mapping populations is a prerequisite for marker-assisted selection (MAS) for cotton yield and fiber quality. To construct a genetic linkage map and to identify QTLs for fiber quality and yield traits, a backcross inbred line (BIL) population of 146 lines was developed from a cross between Upland cotton (Gossypium hirsutum) and Egyptian cotton (Gossypium barbadense) through two generations of backcrossing using Upland cotton as the recurrent parent followed by four generations of self pollination. The BIL population together with its two parents was tested in five environments representing three major cotton production regions in China. The genetic map spanned a total genetic distance of 2,895 cM and contained 392 polymorphic SSR loci with an average genetic distance of 7.4 cM per marker. A total of 67 QTLs including 28 for fiber quality and 39 for yield and its components were detected on 23 chromosomes, each of which explained 6.65-25.27 % of the phenotypic variation. Twenty-nine QTLs were located on the At subgenome originated from a cultivated diploid cotton, while 38 were on the Dt subgenome from an ancestor that does not produce spinnable fibers. Of the eight common QTLs (12 %) detected in more than two environments, two were for fiber quality traits including one for fiber strength and one for uniformity, and six for yield and its components including three for lint yield, one for seedcotton yield, one for lint percentage and one for boll weight. QTL clusters for the same traits or different traits were also identified. This research represents one of the first reports using a permanent advanced backcross inbred population of an interspecific hybrid population to identify QTLs for fiber quality and yield traits in cotton across diverse environments. It provides useful information for transferring desirable genes from G. barbadense to G. hirsutum using MAS.
机译：在不同环境中鉴定稳定的数量性状基因座（QTL）并绘制种群图谱是进行棉花产量和纤维品质标记辅助选择（MAS）的前提。为了构建遗传连锁图并鉴定纤维品质和产量性状的QTL，从陆地棉（陆地棉）和埃及棉（巴巴德棉）之间的杂交发展了回交近交系（BIL）种群146系使用陆地棉作为轮回亲本进行回交，然后进行四代自花授粉。 BIL种群及其两个亲本在代表中国三个主要棉花生产地区的五个环境中进行了测试。遗传图谱的总遗传距离为2895 cM，包含392个多态性SSR位点，每个标记的平均遗传距离为7.4 cM。在23条染色体上共检出67个QTL，包括28个纤维品质和39个产量及其组成，每个QTL解释了表型变异的6.65％至22.27％。二十九个QTL位于At亚基因组上，起源于耕作的二倍体棉花，而三十八个位于来自不产生可纺纤维的祖先的Dt亚基因组上。在两个以上的环境中检测到的八个常见QTL（12％）中，有两个是针对纤维质量特性的，包括一个是针对纤维强度和一个用于均匀度，另一个是六个用于产量及其组成，包括三个用于皮棉产量，一个用于棉籽产量，一个用于皮棉百分比，另一个用于棉铃重量。还确定了相同性状或不同性状的QTL簇。这项研究是使用种间杂种种群的永久先进回交近交种群鉴定不同环境中棉花纤维品质和产量性状的QTL的首批报告之一。它提供了有用的信息，可用于使用MAS将理想的基因从巴巴德氏酵母转移到陆地棉。

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