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Key message <p>Fourteen stable QTL for LP in introgression population of <i>G. mustelinum</i> were detected across multiple environments. <i>GmAOC4</i> encoding allene-oxide cyclase was identified as the candidate gene for the major locus <i>qLP-D12-3</i>.</p> Abstract <p>Cotton (<i>Gossypium</i> spp.) is an important natural fiber crop for the textile industry worldwide. Lint percentage (LP) is one of the most essential yield components of cotton. However, the genetic and molecular mechanisms underlying LP in cotton remain unclear. Here, 264 introgression lines of the <i>G. mustelinum</i> acc. P0811704 in the background of <i>G. hirsutum</i> cv. Emian22 were used to dissect the LP phenotype in ten individual environments. A total of 14 stable quantitative trait loci (QTL) were identified in at least two environments, with phenotypic variation explained by them ranged from 1.12 to 13.14%. Among them, <i>qLP-D12-3</i>, a main-effect QTL, was validated in IL-derived F<sub>2</sub> segregating population (<i>n</i> = 2836), and was fine-mapped to a 110-kb physical region by selected F<sub>2:3</sub> recombinants. Among the seven annotation genes in this region, only one gene, encoding allene-oxide cyclase (<i>AOC4</i>), exhibited a significant expression difference between near-isogenic lines and recurrent parent when lint fibers are initiating. <i>AOC4</i> contains <i>G. mustelinum</i>-specific variation in the promoter region, and highly expressed in fiber cells of the outer layer of ovule. This research would lay a solid foundation for further elucidating the molecular mechanism of cotton fiber initiation.</p>

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Genetic dissection of lint percentage in an introgression population between Gossypium hirsutum and G. mustelinum

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Yang Yang,
  • Bo Li,
  • Yuanxue Li,
  • Zhiyong Xu,
  • Xiaorong Li,
  • Zumuremu Tuerxun,
  • Xunji Chen,
  • Xianlong Zhang,
  • Zhongxu Lin

摘要

Key message

Fourteen stable QTL for LP in introgression population of G. mustelinum were detected across multiple environments. GmAOC4 encoding allene-oxide cyclase was identified as the candidate gene for the major locus qLP-D12-3.

Abstract

Cotton (Gossypium spp.) is an important natural fiber crop for the textile industry worldwide. Lint percentage (LP) is one of the most essential yield components of cotton. However, the genetic and molecular mechanisms underlying LP in cotton remain unclear. Here, 264 introgression lines of the G. mustelinum acc. P0811704 in the background of G. hirsutum cv. Emian22 were used to dissect the LP phenotype in ten individual environments. A total of 14 stable quantitative trait loci (QTL) were identified in at least two environments, with phenotypic variation explained by them ranged from 1.12 to 13.14%. Among them, qLP-D12-3, a main-effect QTL, was validated in IL-derived F2 segregating population (n = 2836), and was fine-mapped to a 110-kb physical region by selected F2:3 recombinants. Among the seven annotation genes in this region, only one gene, encoding allene-oxide cyclase (AOC4), exhibited a significant expression difference between near-isogenic lines and recurrent parent when lint fibers are initiating. AOC4 contains G. mustelinum-specific variation in the promoter region, and highly expressed in fiber cells of the outer layer of ovule. This research would lay a solid foundation for further elucidating the molecular mechanism of cotton fiber initiation.