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Fiber Quality Improvement in Upland Cotton ( Gossypium hirsutum L.): Quantitative Trait Loci Mapping and Marker Assisted Selection Application


Fiber Quality Improvement in Upland Cotton ( Gossypium hirsutum L.): Quantitative Trait Loci Mapping and Marker Assisted Selection Application

Babar Ijaz et al. Front Plant Sci.


Genetic improvement in fiber quality is one of the main challenges for cotton breeders. Fiber quality traits are controlled by multiple genes and are classified as complex quantitative traits, with a negative relationship with yield potential, so the genetic gain is low in traditional genetic improvement by phenotypic selection. The availability of Gossypium genomic sequences facilitates the development of high-throughput molecular markers, quantitative trait loci (QTL) fine mapping and gene identification, which helps us to validate candidate genes and to use marker assisted selection (MAS) on fiber quality in breeding programs. Based on developments of high density linkage maps, QTLs fine mapping, marker selection and omics, we have performed trait dissection on fiber quality traits in diverse populations of upland cotton. QTL mapping combined with multi-omics approaches such as, RNA sequencing datasets to identify differentially expressed genes have benefited the improvement of fiber quality. In this review, we discuss the application of molecular markers, QTL mapping and MAS for fiber quality improvement in upland cotton.

Keywords: Gossypium species; QTL mapping; fiber quality; fine mapping; genetic mechanism; molecular markers.


Figure 1
Figure 1
Overview of the strategies for marker-assisted selection (MAS) to improve fiber quality in Gossypium hirsutum.
Figure 2
Figure 2
Quantitative trait loci (QTLs) distributed across each chromosome in cotton genome. (A) QTLs of fiber quality traits distributed across At and Dt sub-genomes. (B) QTLs mapped in each chromosome. c1–c26 represents chromosome 1 to chromosome 26, respectively. (C) QTLs for different fiber quality traits. FL, fiber length; FS, fiber strength; FE, fiber elongation; FM, fiber maturity; FU, fiber uniformity; Mic, micronaire. (D) The variance (R2) explained by a single QTL related to fiber quality traits. FL, FS, FE, FM, FU, Mic. The same as used above.

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