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The mutation in the critical sterility-inducing temperature-regulating gene OsTMS5 and OsCSIT1 enhances cadmium tolerance in rice seedlings

文献类型： 外文期刊

作者： Wang, Tao 1 ; Deng, Fan 3 ; Gong, Xue 4 ; Wu, Gengwei 4 ; Wang, Lanlan 4 ; Shen, Renfang 5 ; Huang, Jiu 6 ; He, Yi 1 ; Wang, Feng 7 ; Zhu, Xiaofang 5 ; Zhang, Chi 4 ; Wang, Hua 4 ;

作者机构： 1.Zhejiang A&F Univ, Natl Key Lab Dev & Utilizat Forest Food Resources, Hangzhou 311300, Peoples R China

2.Zhejiang A&F Univ, Coll Forestry & Biotechnol, Hangzhou 311300, Peoples R China

3.Zhejiang A&F Univ, Coll Adv Agr Sci, Hangzhou 311300, Peoples R China

4.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, State Key Lab Qual & Safety Agro Prod, Hangzhou 310021, Peoples R China

5.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

6.China Univ Min & Technol, Sch Environm Sci & Spatial Informat, Xuzhou 221116, Peoples R China

7.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizers, State Key Lab Qual & Safety Agro Prod, Hangzhou 310021, Peoples R China

关键词： Cadmium; OsCSIT1; Rice

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.9； 五年影响因子：3.8 ）

ISSN： 0167-6903

年卷期： 2025 年 105 卷 4 期

页码：

收录情况： SCI

摘要： Cadmium (Cd) contamination in farmland poses a threat to food security and human health. This study explores the role of the OsCSIT1 gene in Cd tolerance in rice, using an EMS-mutagenized Ostms5/Oscsit1 double mutant (st1). The st1 mutant exhibited enhanced Cd resistance, with reduced root growth inhibition under 5 mu M CdCl2 treatment compared to the Ostms5 parent line (1892S). Gene expression analysis revealed downregulation of Cd uptake genes (OsNRAMP5, OsCd1) and the transporter OsHMA2, alongside upregulation of detoxification genes (OsABCG36, OsZIP1, OsMTP1) in st1 under Cd stress. These changes correlated with 36% lower Cd accumulation in stems. The findings suggest that OsCSIT1 mutation may alter metal homeostasis by modulating transporter activity, limiting Cd uptake and enhancing vacuolar sequestration. The dual functionality of OsCSIT1-regulating both thermosensitive sterility and Cd tolerance-highlights its potential for developing hybrid rice varieties with reduced grain Cd accumulation. The study provides critical insights into developing climate-resilient, low-Cd rice varieties to address food safety challenges in Cd-contaminated environments.

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