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Advanced Backcross Quantitative Trait Locus Analysis of Fiber Elongation in a Cross between Gossypium hirsutum and G. mustelinum
Author(s) -
Wang Baohua,
Draye Xavier,
Zhang Zhengsheng,
Zhuang Zhimin,
May O. Lloyd,
Paterson Andrew H.,
Chee Peng W.
Publication year - 2016
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2015.12.0753
Subject(s) - biology , backcrossing , introgression , quantitative trait locus , germplasm , genetics , gossypium hirsutum , gossypium , locus (genetics) , allele , genotype , botany , gene
In an effort to explore the secondary gene pool for the enhancement of upland cotton ( Gossypium hirsutum L.) germplasm, we developed advanced‐generation backcross populations by crossing G. hirsutum (PD94042) and Gossypium mustelinum Miers ex Watt (AD4–8), then backcrossing to the G. hirsutum parent for three cycles. Genome‐wide mapping revealed introgressed alleles at an average of 13.8% of loci in each BC 3 F 1 plant, collectively representing G. mustelinum introgression in 80.9% of the genome. Twenty‐one BC 3 F 1 plants were selfed to generate BC 3 F 2 families of 127 to 160 plants per family (totaling 3203 plants), which were field‐tested for fiber elongation and genetically mapped. One‐way ANOVA detected 15 nonoverlapping quantitative trail loci (QTLs) distributed over 12 chromosomes. Individual loci explained from 10.0 to 25.24% of phenotypic variance. Nine stringent QTLs were detected in one‐way ANOVAs and composite interval mapping; two of the nine QTLs explained more than 20% of variance and one was detected in four different families simultaneously with similar additive effects. Although the G. mustelinum parent does not produce spinnable fiber, G. mustelinum alleles contributed to increased fiber elongation for three of the nine stringent QTLs and five of the 15 total QTLs. Two‐way ANOVA detected significant ( P < 0.001) among‐family genotype effects and genotype × family interactions, suggesting that the phenotypic effects of some introgressed chromosomal segments are dependent on the existence of other chromosomal segments. Gossypium mustelinum alleles that contribute to increased fiber elongation are of great interest to be further exploited in cotton breeding.