Abstract
Fiber quality and yield-related traits are important agronomic traits in cotton breeding. To detect the genetic basis of fiber quality and yield related traits, a recombinant inbred line (RIL) population consisting of 182 lines was established from a cross between Gossypium hirsutum cultivar CCRI35 and G. hirsutum race palmeri accession TX-832. The RIL population was deeply genotyped using SLAF-seq and was phenotyped in six environments. A high-density genetic linkage map with 15,765 SNP markers and 153 SSR markers was constructed, with an average distance of 0.30 cM between adjacent markers. A total of 210 fiber quality quantitative trait loci (QTLs) and 73 yield-related QTLs were identified. Of the detected QTLs, 62 fiber quality QTLs and 10 yield-related QTLs were stable across multiple environments. Twelve and twenty QTL clusters were detected on the At and Dt subgenome, respectively. Twenty-three major QTL clusters were further validated through associated analysis and five candidate genes of four stable fiber quality QTLs were identified. This study revealed elite loci influencing fiber quality and yield and significant phenotypic selection regions during G. hirsutum domestication, and set a stage for future utilization of molecular marker assisted breeding in cotton breeding programs.
Highlights
Cotton, with more than 7,000 years of cultivation history, is the most significant natural fiber crop and an important resource of plant protein and oil (Yuan et al, 2015; Wang M. et al, 2017)
The fiber micronaire performance of TX-832 was better than CCRI35, whereas the fiber elongation traits were comparable between the two parents
Modern G. hirsutum cultivars had been domesticated in many traits including the grown habit, high yield, and superior fiber quality (Fang L. et al, 2017), causing narrow genetic basis among cultivars but rich genetic diversity between races and cultivars (Lacape et al, 2006)
Summary
With more than 7,000 years of cultivation history, is the most significant natural fiber crop and an important resource of plant protein and oil (Yuan et al, 2015; Wang M. et al, 2017). G. hirsutum races are classified into seven races (yucatanense, mariegalante, morrlli, richmondii, punctatum, palmeri and latifolium) according to their geographical distribution (Brubaker et al, 1999; Lacape et al, 2006). They were confirmed with promising phenotypes, including resistance to biotic stress and abiotic stress, and agronomically important traits such as variable fiber quality and yield traits (Okubazghi et al, 2017; Zhang et al, 2019). G. hirsutum races could be crossed with cultivars directly and were gradually utilized to broaden the genetic basis of modern cotton cultivars and improve fiber quality and yieldrelated traits (Wang Y. et al, 2016; Okubazghi et al, 2017; Feng et al, 2019)
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