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首页> 外文期刊>Frontiers in Plant Science >QTLs Analysis and Validation for Fiber Quality Traits Using Maternal Backcross Population in Upland Cotton
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QTLs Analysis and Validation for Fiber Quality Traits Using Maternal Backcross Population in Upland Cotton

机译：利用陆地棉回交群体对纤维品质性状进行QTL分析和验证

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Cotton fiber is renewable natural fiber source for textile. Improving fiber quality is an essential goal for cotton breeding project. In present study, F_(14)recombinant inbred line (RIL) population was backcrossed by the maternal parent to obtain a backcross (BC) population, derived from one Upland cotton hybrid. Three repetitive field trials were performed by randomized complete block design with two replicates in three locations in 2015, together with the BC population, common male parent and the RIL population. Totally, 26 QTLs in BC population explained 5.00–14.17% of phenotype variation (PV) and 37 quantitative trait loci (QTL) were detected in RIL population explaining 5.13–34.00% of PV. Seven common QTLs detected simultaneously in two populations explained PV from 7.69 to 23.05%. A total of 20 QTLs in present study verified the previous results across three environments in 2012. Particularly, qFL-Chr5-2 controlling fiber length on chromosome 5 explained 34.00% of PV, while qFL-Chr5-3 only within a 0.8 cM interval explained 13.93% of PV on average in multiple environments. These stable QTLs explaining great variation offered essential information for marker-assisted selection (MAS) to improve fiber quality traits. Lots of epistasis being detected in both populations acted as one of important genetic compositions of fiber quality traits.
机译：棉纤维是纺织的可再生天然纤维来源。提高纤维质量是棉花育种项目的基本目标。在本研究中，F_（14）重组自交系（RIL）群体与母本进行了回交，获得了一个陆地棉杂交种的回交（BC）群体。 2015年，通过随机完整区组设计进行了三项重复的田间试验，并在BC人群，普通男性父母和RIL人群中在三个地点进行了两次重复试验。总共，BC人群中有26个QTL解释了表型变异（PV）的5.00-14.17％，RIL人群中有37个定量性状基因座（QTL）解释了PV的5.13-34.00％。在两个种群中同时检测到的七个常见QTL解释PV为7.69至23.05％。本研究中共有20个QTL验证了2012年在三个环境中的先前结果。特别是，控制5号染色体上纤维长度的qFL-Chr5-2解释了PV的34.00％，而qFL-Chr5-3仅解释了0.8 cM间隔在多个环境中，平均PV为13.93％。这些稳定的QTL解释了巨大的差异，为标记辅助选择（MAS）提供了必要的信息，以改善纤维品质。在这两个种群中检测到的许多上位性是纤维品质性状的重要遗传组成之一。

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