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. 2022 Aug 18:13:981682.
doi: 10.3389/fpls.2022.981682. eCollection 2022.

Identification of small effect quantitative trait loci of plant architectural, flowering, and early maturity traits in reciprocal interspecific introgression population in cotton

Rahul Chandnani  1 , Changsoo Kim  1   2 , Jinesh D Patel  1 , Hui Guo  1 , Tariq Shehzad  1 , Jason G Wallace  3 , Daohua He  4 , Zhengsheng Zhang  5 , Jeevan Adhikari  1 , Sameer Khanal  1 , Peng W Chee  6 , Andrew H Paterson  1
Affiliations

Identification of small effect quantitative trait loci of plant architectural, flowering, and early maturity traits in reciprocal interspecific introgression population in cotton

Rahul Chandnani et al. Front Plant Sci. .

Abstract

Plant architecture, flowering time and maturity traits are important determinants of yield and fiber quality of cotton. Genetic dissection of loci determining these yield and quality components is complicated by numerous loci with alleles conferring small differences. Therefore, mapping populations segregating for smaller numbers and sizes of introgressed segments is expected to facilitate dissection of these complex quantitative traits. At an advanced stage in the development of reciprocal advanced backcross populations from crosses between elite Gossypium hirsutum cultivar 'Acala Maxxa' (GH) and G. barbadense 'Pima S6' (GB), we undertook mapping of plant architectural traits, flowering time and maturity. A total of 284 BC4F1 and BC4F2 progeny rows, 120 in GH and 164 in GB background, were evaluated for phenotype, with only 4 and 3 (of 7) traits showing significant differences among progenies. Genotyping by sequencing yielded 3,186 and 3,026 SNPs, respectively, that revealed a total of 27 QTLs in GH background and 22 in GB, for plant height, days to flowering, residual flowering at maturity and maturity. More than of 90% QTLs identified in both backgrounds had small effects (%PV < 10), supporting the merit of this population structure to reduce background noise and small effect QTLs. Germplasm developed in this study may serve as potential pre-breeding material to develop improved cotton cultivars.

Keywords: cotton; flowering; introgression; maturity; plant height; quantitative trait loci.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
Chromosomal positions of SNP markers identified as QTLs for plant architectural, flowering and early maturity traits in an interspecific population in Gossypium hirsutum background introgressed with Gossypium barbadense chromosomal segments. QTLs for plant height (H) with red, days to flowering (DOF) with green, maturity (M) with light green, residual flowering (F) with blue, and residual flowering and days to flowering (F&DOF) were highlighted with magenta colors.
Figure 2
Figure 2
Chromosomal positions of SNP markers identified as QTLs for plant architectural, flowering and early maturity traits in an interspecific population in Gossypium barbadense background introgressed with Gossypium hirsutum chromosomal segments. QTLs for plant height (H) with red, days to flowering (DOF) with green, maturity (M) with light green, residual flowering (F) with blue, and residual flowering and days to flowering (F&DOF) were highlighted with magenta colors.
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