在籼稻中过表达OsCAX2可以减少籽粒中的镉积累而不影响产量

doi:10.1016/j.jia.2025.08.011

Journal of Integrative Agriculture ›› 2026, Vol. 25 ›› Issue (1): 390-393.DOI: 10.1016/j.jia.2025.08.011

在籼稻中过表达OsCAX2可以减少籽粒中的镉积累而不影响产量

收稿日期:2025-06-20 修回日期:2025-08-05 接受日期:2025-07-25 出版日期:2026-01-20 发布日期:2025-12-09

Overexpression of OsCAX2 in indica rice reduces cadmium accumulation in grains without yield loss

Zhi Hu¹, Wenli Zou^{2, 3, 4}, Huijing Ye¹, Jie Ma¹, Lijun Meng^{3, 5#}, Jingguang Chen^1#, Guoyou Ye^{2, 3, 6}

¹School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China
²CAAS-IRRI Joint Laboratory for Genomics-Assisted Germplasm Enhancement/Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences (CAAS), Shenzhen 518120, China
³Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture/Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs/Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518120, China
⁴School of Life Sciences, Jiangxi Science & Technology Normal University, Nanchang 330038, China
⁵Kunpeng Institute of Modern Agriculture at Foshan, Foshan 528225, China
⁶Rice Breeding Innovations Platform, International Rice Research Institute (IRRI), Metro Manila 1301, Philippines

Received:2025-06-20 Revised:2025-08-05 Accepted:2025-07-25 Online:2026-01-20 Published:2025-12-09
About author:#Correspondence Lijun Meng, E-mail: menglijun@caas.cn; Jingguang Chen, E-mail: chenjg28@mail.sysu.edu.cn
Supported by:
This work was financially supported by the National Key R&D Program of China (2024YFD1200800) and the Guangdong Basic and Applied Basic Research Foundation, China (2024A1515030094).

摘要/Abstract

摘要：

镉（Cd）作为Ⅰ类致癌物，大米是亚洲人群Cd摄入的主要途径，尤其在中国南方稻田Cd污染高风险区。本研究发现，水稻钙/氢离子交换蛋白基因OsCAX2在根中的表达受Cd胁迫诱导上调。亚细胞定位证实OsCAX2蛋白定位于液泡膜。水培实验表明，OsCAX2过表达株系根系Cd积累显著增加，而地上部Cd积累显著减少，根向地上部的Cd转运率降低43.7%，且植株生长未受影响；在Cd污染土壤（1 mg kg⁻¹ Cd）下种植发现，过表达株系糙米和剑叶中Cd含量分别较野生型显著降低49.1%和39.7%，且关键农艺性状及产量无显著变化。这些结果表明，过表达OsCAX2可能通过增强根细胞液泡对Cd的区隔化存储，有效阻遏Cd向地上部及籽粒转运，为培育适用于中国南方Cd污染区的低Cd积累高产籼稻品种提供了重要的理论基础和基因资源。

Zhi Hu, Wenli Zou, Huijing Ye, Jie Ma, Lijun Meng, Jingguang Chen, Guoyou Ye. 在籼稻中过表达OsCAX2可以减少籽粒中的镉积累而不影响产量[J]. Journal of Integrative Agriculture, 2026, 25(1): 390-393.

Zhi Hu, Wenli Zou, Huijing Ye, Jie Ma, Lijun Meng, Jingguang Chen, Guoyou Ye. Overexpression of OsCAX2 in indica rice reduces cadmium accumulation in grains without yield loss[J]. Journal of Integrative Agriculture, 2026, 25(1): 390-393.

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在籼稻中过表达OsCAX2可以减少籽粒中的镉积累而不影响产量

Overexpression of OsCAX2 in indica rice reduces cadmium accumulation in grains without yield loss

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