Abstract
BackgroundGossypium barbadense (Sea Island, Egyptian or Pima cotton) cotton has high fiber quality, however, few studies have investigated the genetic basis of its traits using molecular markers. Genome complexity reduction approaches such as genotyping-by-sequencing have been utilized to develop abundant markers for the construction of high-density genetic maps to locate quantitative trait loci (QTLs).ResultsThe Chinese G. barbadense cultivar 5917 and American Pima S-7 were used to develop a recombinant inbred line (RIL) population with 143 lines. The 143 RILs together with their parents were tested in three replicated field tests for lint yield traits (boll weight and lint percentage) and fiber quality traits (fiber length, fiber elongation, fiber strength, fiber uniformity and micronaire) and then genotyped using GBS to develop single-nucleotide polymorphism (SNP) markers. A high-density genetic map with 26 linkage groups (LGs) was constructed using 3557 GBS SNPs spanning a total genetic distance of 3076.23 cM at an average density of 1.09 cM between adjacent markers. A total of 42 QTLs were identified, including 24 QTLs on 12 LGs for fiber quality and 18 QTLs on 7 LGs for lint yield traits, with LG1 (9 QTLs), LG10 (7 QTLs) and LG14 (6 QTLs) carrying more QTLs. Common QTLs for the same traits and overlapping QTLs for different traits were detected. Each individual QTLs explained 0.97 to 20.7% of the phenotypic variation.ConclusionsThis study represents one of the first genetic mapping studies on the fiber quality and lint yield traits in a RIL population of G. barbadense using GBS-SNPs. The results provide important information for the subsequent fine mapping of QTLs and the prediction of candidate genes towards map-based cloning and marker-assisted selection in cotton.
Highlights
Gossypium barbadense (Sea Island, Egyptian or Pima cotton) cotton has high fiber quality, few studies have investigated the genetic basis of its traits using molecular markers
The results of one-way ANOVA showed no significant differences in seven traits between the two parents except for fiber strength (FS) and lint percentage (LP) (Table 1)
The fiber elongation (FE) and LP showed little difference between the parents, large variations in these traits were observed in the progeny because of interactions between genes
Summary
Gossypium barbadense (Sea Island, Egyptian or Pima cotton) cotton has high fiber quality, few studies have investigated the genetic basis of its traits using molecular markers. Genome complexity reduction approaches such as genotyping-by-sequencing have been utilized to develop abundant markers for the construction of high-density genetic maps to locate quantitative trait loci (QTLs). Many complexity reduction approaches are available, such as genotyping-by-sequencing (GBS) [22,23,24], restriction site-associated DNA (RAD) sequencing [25,26,27,28,29] and specific locus-amplified fragment (SLAF) sequencing [30,31,32,33,34] These technologies have been applied to many crops to construct genetic maps for QTL mapping
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
