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. 2017 Oct 25:8:1848.
doi: 10.3389/fpls.2017.01848. eCollection 2017.

Advanced Backcross QTL Analysis of Fiber Strength and Fineness in a Cross between Gossypium hirsutum and G. mustelinum

Baohua Wang  1   2   3 , Zhimin Zhuang  1   3 , Zhengsheng Zhang  2   4 , Xavier Draye  5 , Lan-Shuan Shuang  2 , Tariq Shehzad  2 , Edward L Lubbers  3 , Don Jones  6 , O Lloyd May  3 , Andrew H Paterson  2 , Peng W Chee  3
Affiliations

Advanced Backcross QTL Analysis of Fiber Strength and Fineness in a Cross between Gossypium hirsutum and G. mustelinum

Baohua Wang et al. Front Plant Sci. .

Abstract

The molecular genetic basis of cotton fiber strength and fineness in crosses between Gossypium mustelinum and Gossypium hirsutum (Upland cotton) was dissected using 21 BC3F2 and 12 corresponding BC3F2:3 and BC3F2:4 families. The BC3F2 families were genotyped with simple sequence repeat markers from a G. hirsutum by G. mustelinum linkage map, and the three generations of BC3-derived families were phenotyped for fiber strength (STR) and fineness (Micronaire, MIC). A total of 42 quantitative trait loci (QTLs) were identified through one-way analysis of variance, including 15 QTLs for STR and 27 for MIC, with the percentage of variance explained by individual loci averaging 13.86 and 14.06%, respectively. Eighteen of the 42 QTLs were detected at least twice near the same markers in different generations/families or near linked markers in the same family, and 28 of the 42 QTLs were identified in both mixed model-based composite interval mapping and one-way variance analyses. Alleles from G. mustelinum increased STR for eight of 15 and reduced MIC for 15 of 27 QTLs. Significant among-family genotypic effects (P < 0.001) were detected in 13 and 10 loci for STR and MIC respectively, and five loci showed significant (P < 0.001) genotype × family interaction for MIC. These results support the hypothesis that fiber quality improvement for Upland cotton could be realized by introgressing G. mustelinum alleles although complexities due to the different effects of genetic background on introgressed chromatin might be faced. Building on prior work with G. barbadense, G. tomentosum, and G. darwinii, QTL mapping involving introgression of G. mustelinum alleles offers new allelic variation to Upland cotton germplasm.

Keywords: fiber fineness; fiber strength; genetic diversity; introgression; marker-assisted breeding.

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Figures

Figure 1
Figure 1
Phenotypic distribution of fiber strength (STR) and fineness (Micronaire, MIC) demonstrated by family mean deviation from recurrent Gossypium hirsutum (GH) parent.
Figure 2
Figure 2
QTLs of fiber strength (STR) and fineness (Micronaire, MIC). The solid black bars indicated QTLs of STR, and the green bars filled with slashes indicated QTLs of MIC.
See this image and copyright information in PMC

References

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