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Review
.2022 Mar 31:13:855574.
doi: 10.3389/fgene.2022.855574. eCollection 2022.

Inheritance, QTLs, and Candidate Genes of Lint Percentage in Upland Cotton

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Review

Inheritance, QTLs, and Candidate Genes of Lint Percentage in Upland Cotton

Hao Niu et al. Front Genet..

Abstract

Cotton (Gossypium spp.) is an important natural fiber plant. Lint percentage (LP) is one of the most important determinants of cotton yield and is a typical quantitative trait with high variation and heritability. Many cotton LP genetic linkages and association maps have been reported. This work summarizes the inheritance, quantitative trait loci (QTLs), and candidate genes of LP to facilitate LP genetic study and molecular breeding. More than 1439 QTLs controlling LP have been reported. Excluding replicate QTLs, 417 unique QTLs have been identified on 26 chromosomes, including 243 QTLs identified at LOD >3. More than 60 are stable, major effective QTLs that can be used in marker-assisted selection (MAS). More than 90 candidate genes for LP have been reported. These genes encode MYB, HOX, NET, and other proteins, and most are preferentially expressed during fiber initiation and elongation. A putative molecular regulatory model of LP was constructed and provides the foundation for the genetic study and molecular breeding of LP.

Keywords: gene; inheritance; lint percentage; quantitative trait locus; upland cotton (Gossypium hirsutum L.).

Copyright © 2022 Niu, Ge, Shang and Yuan.

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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
A consensus physical map of QTLs for LP in upland cotton. The QTLs were mapped toG. hirsutum genome by the locations of their linked markers. Left: the marker unit is Mb.
FIGURE 2
FIGURE 2
The major biological processes of the candidate genes of the QTLs for LP.
FIGURE 3
FIGURE 3
Candidate genes (gene number) that regulate LP are involved in major metabolic pathways.
FIGURE 4
FIGURE 4
A molecular regulatory network of cotton fiber development. In the schematic, arrows indicate positive regulation; symbols of ‘T’ indicate negative regulation; lines indicate receptor or interaction; three tightly connected rectangles indicate tri-molecular complexes; red letters in clouds indicate phytohormones. Et, ethylene; ABA, abscisic acid; GA, gibberellin; JA, jasmonic acid; ROS, reactive oxygen species. “Gh” before gene symbols was omitted for space. The detailed information of the genes and their functions in cotton fiber development is listed in Supplementary Table S8.
FIGURE 5
FIGURE 5
Proposed molecular regulatory network for LP. The gray rectangle indicates the four overlapped fiber developmental stages. The arrows indicate the regulatory relationships. The yellow rectangles indicate biological processes. The circles indicate different regulators. All genes and favorable alleles are preferentially and highly expressed during the initiation and early elongation stages; however, BR and JA pathways are repressed. The red rectangle indicates the active biological processes that help increase LP.
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References

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