文献类型： 外文期刊
作者： Xie, Kaizhen 1 ; Niu, Fuan 1 ; Hu, Peng 2 ; Cheng, Can 1 ; Chu, Huangwei 1 ; Zhou, Jihua 1 ; Sun, Bin 1 ; Dai, Yuting 1 ; Cao, Liming 1 ; Zhang, Anpeng 1 ;
作者机构： 1.Shanghai Acad Agr Sci, Minist Agr & Rural Affairs, Crop Breeding & Cultivat Res Inst, Key Lab Germplasm Innovat & Genet Improvement Grai, Shanghai 201403, Peoples R China
2.Hubei Acad Agr Sci, Inst Food Crops, Hubei Key Lab Food Crop Germplasm & Genet Improvem, Wuhan 430064, Peoples R China
关键词：
rice; narrow-leaf mutant; fine-mapping;
期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）
ISSN： 2223-7747
年卷期： 2025 年 14 卷 16 期
页码：
收录情况： SCI
摘要： Leaf morphology significantly impacts rice (Oryza sativa L.) plant architecture and yield. Here, we identified and characterized a novel narrow-leaf mutant, nal25, derived from indica rice cultivar 'Huazhan' using EMS mutagenesis. Phenotypic analyses revealed that nal25 exhibited significantly narrower leaves, reduced plant height, increased tiller number, and notably decreased grain size, seed setting rate, and thousand-grain weight compared to the wild type. Genetic analyses demonstrated that the narrow-leaf phenotype is controlled by a single recessive nuclear gene. Through precise localization analysis, the NAL25 gene was located within a region of approximately 103 kb on the long arm of rice chromosome 7. The sequencing results showed that the mutant nal25 had a T to C mutation at position 173 of the heat-shock protein gene LOC_Os07g09450 encoding the DnaJ domain in this interval, resulting in a change in amino acid 58 from leucine to proline. The qRT-PCR results showed that the expression level of NAL25 gene decreased in the mutant. The nal25 mutant obtained in this study exhibits stable mutant phenotypes, including dwarfism and excessive tillering, traits typically unfavorable for rice production. Nevertheless, it serves as valuable genetic material for forward genetics approaches to identify yield-related genes regulating leaf morphology and culm height. Thus, research on the nal25 mutant advances the development of rice varieties with ideal plant architecture, thereby stabilizing yield increases and safeguarding global food security.
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