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Genetic Map Construction and Fiber Quality QTL Mapping Using the CottonSNP80K Array in Upland Cotton
Zhaoyun Tan1, Zhiqin Zhang1, Xujing Sun1
1College of Agronomy and Biotechnology, Southwest University, Chongqing, China.
Frontiers in Plant Science
|March 15, 2018
Summary
Researchers identified 104 quantitative trait loci (QTL) influencing cotton fiber quality by crossing two cultivars and analyzing recombinant inbred lines. Stable QTL offer targets for improving cotton breeding through marker-assisted selection (MAS).
Area of Science:
- Plant genetics
- Agricultural science
- Molecular biology
Background:
- Cotton fiber quality is a complex trait governed by numerous quantitative trait loci (QTL).
- Improving fiber quality necessitates broad genetic resources and understanding the underlying genetic architecture.
Purpose of the Study:
- To dissect the genetic basis of fiber quality variation between Upland cotton cultivars 'Acala Maxxa' and 'Yumian 1'.
- To identify stable quantitative trait loci (QTL) for cotton fiber quality traits for potential application in breeding programs.
Main Methods:
- Construction of a high-density genetic map using 12116 SNP markers from the CottonSNP80K assay.
- Analysis of 180 recombinant inbred lines (RILs) derived from a cross between 'Acala Maxxa' and 'Yumian 1'.
- Quantitative trait loci (QTL) mapping across three different environmental conditions.
Main Results:
- A genetic map spanning 3741.81 cM with an average marker interval of 0.31 cM was constructed.
- A total of 104 QTL controlling cotton fiber quality traits were detected.
- Nineteen QTL clusters were identified, with nine containing at least one stable QTL (detected across all three environments for a specific trait).
Conclusions:
- Stable QTL and QTL clusters represent key targets for fine mapping and candidate gene identification.
- These findings provide a foundation for understanding the molecular mechanisms of cotton fiber development.
- The identified stable QTL are valuable for marker-assisted selection (MAS) to accelerate cotton breeding for enhanced fiber quality.
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