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Peer-reviewedCC BYInternational journal of molecular sciences

Improving Grain Shape of the Rice Variety Exiangsimiao by Introgressing the Long-Grain Allele of GL7/GW7

  • Hui Hu1
  • Zhilian Qi1
  • Zheqin Wang1
  • Nannan Liu1
  • Junying Xu2
  • Haiyang Liu2
  • Longwei Yang2
  • Jiefeng Jiang3
  • Famao Liang4
  • Xianjin Qiu2
4 affiliations
  1. 1College of Arts and Sciences, Yangtze University, Jingzhou 434020, China
  2. 2Hubei Key Laboratory of Waterlogging Disaster and Agricultural Use of Wetland/Key Laboratory of Green and Efficient Production of Crops in the Middle Reaches of the Yangtze River, Ministry of Agriculture and Rural Affairs (Coconstructed by Ministry and Province), Yangtze University, Jingzhou 434025, China
  3. 3Ningbo Academy of Agricultural Sciences, Ningbo 315101, China
  4. 4Yichang Academy of Agricultural Sciences, Yichang 443004, China
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Abstract

Exiangsimiao (EXSM) is a high-yield and high-quality indica variety and restorer line. However, its grains are not sufficiently slender. In this study, the long-grain allele of the grain shape gene GL7/GW7 was introgressed into EXSM via marker-assisted selection combined with backcross breeding, and two improved long-grain lines (EXSM-IL1 and EXSM-IL2) were developed. Their background recovery rates reached 96.70% and 97.50%, respectively. Their grain lengths (GLs) and length-to-width ratios (LWRs) were significantly higher than EXSM. The milling quality, especially the head milled rice rate (HMRR), of both improved lines was significantly lower than EXSM. EXSM-IL1 showed no significant difference in grain yield (GY) to EXSM, although both improved lines had shorter total growth duration (TGD), longer panicle length (PL), and a lower seed setting ratio (SSR) and 1000-grain weight (KGW). Six hybrid combinations derived from the improved lines exhibited longer GL, higher LWR and narrower GW than those of the hybrid combinations derived from EXSM. The TGD and KGW of the six hybrid combinations were significantly lower compared with the hybrids from EXSM. Furthermore, the two improved lines carried 41 favorable genes associated with crucial traits. These results provide the basis for rice grain shape improvement and supply long-grain and high-quality breeding lines and restorer lines for rice production in southern China.

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Cite

BibTeXRIS
BibTeX
@article{hu2026improving,
  title = {{Improving Grain Shape of the Rice Variety Exiangsimiao by Introgressing the Long-Grain Allele of GL7/GW7}},
  author = {Hui Hu and Zhilian Qi and Zheqin Wang and Nannan Liu and Junying Xu and Haiyang Liu and Longwei Yang and Jiefeng Jiang and Famao Liang and Xianjin Qiu},
  journal = {International journal of molecular sciences},
  year = {2026},
  month = oct,
  doi = {10.3390/ijms27198930},
  url = {https://europepmc.org/article/PMC/PMC13666307},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Improving Grain Shape of the Rice Variety Exiangsimiao by Introgressing the Long-Grain Allele of GL7/GW7
AU  - Hui Hu
AU  - Zhilian Qi
AU  - Zheqin Wang
AU  - Nannan Liu
AU  - Junying Xu
AU  - Haiyang Liu
AU  - Longwei Yang
AU  - Jiefeng Jiang
AU  - Famao Liang
AU  - Xianjin Qiu
PY  - 2026
DA  - 2026/10/01
JO  - International journal of molecular sciences
DO  - 10.3390/ijms27198930
UR  - https://europepmc.org/article/PMC/PMC13666307
AB  - Exiangsimiao (EXSM) is a high-yield and high-quality indica variety and restorer line. However, its grains are not sufficiently slender. In this study, the long-grain allele of the grain shape gene GL7/GW7 was introgressed into EXSM via marker-assisted selection combined with backcross breeding, and two improved long-grain lines (EXSM-IL1 and EXSM-IL2) were developed. Their background recovery rates reached 96.70% and 97.50%, respectively. Their grain lengths (GLs) and length-to-width ratios (LWRs) were significantly higher than EXSM. The milling quality, especially the head milled rice rate (HMRR), of both improved lines was significantly lower than EXSM. EXSM-IL1 showed no significant difference in grain yield (GY) to EXSM, although both improved lines had shorter total growth duration (TGD), longer panicle length (PL), and a lower seed setting ratio (SSR) and 1000-grain weight (KGW). Six hybrid combinations derived from the improved lines exhibited longer GL, higher LWR and narrower GW than those of the hybrid combinations derived from EXSM. The TGD and KGW of the six hybrid combinations were significantly lower compared with the hybrids from EXSM. Furthermore, the two improved lines carried 41 favorable genes associated with crucial traits. These results provide the basis for rice grain shape improvement and supply long-grain and high-quality breeding lines and restorer lines for rice production in southern China.
SN  - 1422-0067
ER  -