Abstract
Fiber quality and yield are important traits of cotton. Quantitative trait locus (QTL) mapping is a prerequisite for marker-assisted selection (MAS) in cotton breeding. To identify QTLs for fiber quality and yield traits, 4 backcross-generation populations (BC1F1, BC1S1, BC2F1, and BC3F0) were developed from an interspecific cross between CCRI36 (Gossypium hirsutum L.) and Hai1 (G. barbadense L.). A total of 153 QTLs for fiber quality and yield traits were identified based on data from the BC1F1, BC1S1, BC2F1 and BC3F0 populations in the field and from the BC2F1 population in an artificial disease nursery using a high-density genetic linkage map with 2292 marker loci covering 5115.16 centimorgans (cM) from the BC1F1 population. These QTLs were located on 24 chromosomes, and each could explain 4.98–19.80% of the observed phenotypic variations. Among the 153 QTLs, 30 were consistent with those identified previously. Specifically, 23 QTLs were stably detected in 2 or 3 environments or generations, 6 of which were consistent with those identified previously and the other 17 of which were stable and novel. Ten QTL clusters for different traits were found and 9 of them were novel, which explained the significant correlations among some phenotypic traits in the populations. The results including these stable or consensus QTLs provide valuable information for marker-assisted selection (MAS) in cotton breeding and will help better understand the genetic basis of fiber quality and yield traits, which can then be used in QTL cloning.
Highlights
Cotton is an important economic crop worldwide that produces natural fibers used as raw materials in the textile industry
This study reports the identification of Quantitative trait locus (QTL) related to fiber yield and fiber quality traits using a high-density map and 5 backcross populations from the same interspecific hybrid of the two cultivated tetraploid species
Three backcross generations (BC1F1, BC1S1 and BC2F1) were derived from an interspecific cross between CCRI36 (G. hirsutum L.) and Hai1 (G. barbadense L.), of which CCRI36, the recipient parent, is a high yield cultivar bred by the Institute of Cotton Research (ICR), Chinese Academy of Agricultural Sciences (CAAS) and Hai1, the donor parent, is a cultivated cotton line of G. barbadense with superb fiber quality, and high resistance to Verticillium wilt (VW) and the dominant glandless trait (Shi et al 2016)
Summary
Cotton is an important economic crop worldwide that produces natural fibers used as raw materials in the textile industry. Gossypium barbadense and G. hirsutum are the two most economically important tetraploid cultivated species The former (including Egyptian cotton, Pima cotton and Sea–Island cotton) has longer, stronger and finer fibers; its disadvantages were a low yield and narrow adaptation. The latter (Upland cotton), has a high yield and is widely grown in many countries, accounting for approximately 95% of global cotton production (Chen et al 2007); it has a relatively low fiber quality.
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