Abstract
Cotton fiber is renewable natural fiber source for textile. Improving fiber quality is an essential goal for cotton breeding project. In present study, F14 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.
Highlights
Upland cotton (Gossypium hirsutum L.) is one of the most important fiber crops, which accounts for more than 92% of cultivated cotton worldwide because of its higher yield potential, and adaptation to diverse environments (Zhang T. et al, 2015)
Recombinant inbred line (RIL) population has been considered as a permanent mapping population, in which the number of homozygous alleles could be used to dissect the additive effect of allele(s)
In order to resolve genetic components related fiber quality traits and reveal the genetic mechanism more details, we further developed BCF1 progenies population based on recombinant inbred line (RIL) population by testcrossing with the maternal parent and attempted to investigate quantitative trait loci (QTL) in fiber quality traits in both RIL and BCF1 populations across three environments in present study
Summary
Upland cotton (Gossypium hirsutum L.) is one of the most important fiber crops, which accounts for more than 92% of cultivated cotton worldwide because of its higher yield potential, and adaptation to diverse environments (Zhang T. et al, 2015). Fiber quality of Upland cotton is not as good as that of Sea Island cotton (G. barbadense L.). Recombinant inbred line (RIL) population has been considered as a permanent mapping population, in which the number of homozygous alleles could be used to dissect the additive effect of allele(s). The backcross (BC) population deriving from RIL population by test cross or back cross, is suitable to be used to identify QTLs, to detect the dominant effect, and to carry out multiple trials across multi-environments and repeat observations, to some extent to “immortalized” F2
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
