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Updated: Mar 31, 2026

Identifying Mutations by High Resolution Melting in a TILLING Population of Rice
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QTL identification for yield components using single segment substitution lines dissected by rice CSSL-Z799.

Xiaodong Wang1, Aoni Xiang1, Xinyu Fan1

  • 1Rice Research Institute, Southwest University/Academy of Agricultural Sciences, Southwest University/Chongqing Key Laboratory of Crop Molecular Improvement, Chongqing, China.

Frontiers in Plant Science
|March 30, 2026
PubMed
Summary

Researchers developed novel rice lines to improve yield by identifying quantitative trait loci (QTL) for grain length. These lines enhance grain length through cell division or expansion, aiding future breeding strategies.

Keywords:
additive effectschromosome segment substitution line (CSSL)quantitative trait locus/loci (QTL) mappingriceyield-related traits

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Area of Science:

  • Plant genetics and breeding
  • Crop improvement
  • Quantitative trait loci (QTL) analysis

Background:

  • Rice (Oryza sativa L.) is a vital cereal crop requiring continuous yield enhancement.
  • Improving complex quantitative traits like yield components is challenging due to polygenic inheritance.
  • Chromosome Segment Substitution Lines (CSSLs) are valuable tools for gene discovery and precision breeding in rice.

Purpose of the Study:

  • To identify quantitative trait loci (QTL) controlling yield-related traits in rice using CSSLs.
  • To elucidate the cellular mechanisms underlying enhanced grain length.
  • To provide a foundation for gene cloning and marker-assisted breeding in rice.

Main Methods:

  • Development of a CSSL (Z799) with substituted segments from a restorer line (R225) into a recipient background (Nipponbare).
  • Phenotypic evaluation of CSSLs for yield-related traits.
  • Quantitative trait loci (QTL) mapping using both F2 and CSSL populations.
  • Microscopic analysis of lemma cells to investigate cellular mechanisms.

Main Results:

  • A CSSL population (S1-S5) identified a total of 35 QTL, surpassing the 27 QTL found in an F2 population.
  • Five distinct QTL (qGL1, qGL3, qGL12-1, qGL12-2, qGL12-3) significantly increased rice grain length without affecting grain width.
  • Two mechanisms were identified: four QTL enhanced grain length via increased cell division, while one QTL promoted cell expansion.

Conclusions:

  • The study successfully identified multiple QTL associated with enhanced grain length in rice.
  • Distinct cellular mechanisms (cell division vs. cell expansion) contribute to grain length.
  • The developed CSSLs offer a powerful platform for dissecting genetic complexity and advancing rice breeding programs.