College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China; State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, People's Republic of China.
State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, People's Republic of China.
Sci Total Environ. 2022 Nov 10;846:157484. doi: 10.1016/j.scitotenv.2022.157484. Epub 2022 Jul 20.
Irrigation has been considered an effective approach for decreasing cadmium (Cd) uptake and accumulation in rice (Oryza sativa), but increasing evidence shows that the effects of different water management strategies on Cd accumulation in rice are contradictory in different studies, and the detailed regulatory mechanisms remain unconfirmed. Most previous studies have shown that irrigation regulates Cd accumulation in rice mainly by affecting Cd bioavailability, pH and redox potential (Eh) in soil, and few reports have focused on the function of oxygen (O) in regulating the physiological mechanisms of rice on Cd tolerance or accumulation. Here, we concluded that irrigation affects Cd bioavailability, pH and Eh in soil mainly by regulating O content. In addition, recent studies have also shown that irrigation-regulated O also affects Cd accumulation in rice by affecting iron plaque (IP), the radial oxygen loss (ROL) barrier, the cell wall and mass flow in rice roots. All these results indicate that O is the key factor in irrigation-regulated Cd accumulation in rice, and dramatic result variations from different irrigation experiments are due to the different rhizosphere O conditions. This review will help clarify the effects and regulatory mechanisms of irrigation on Cd accumulation in rice and reveal the roles of O in this process.
灌溉被认为是减少水稻（Oryza sativa）中镉（Cd）吸收和积累的有效方法，但越来越多的证据表明，不同的水分管理策略对水稻中 Cd 积累的影响在不同的研究中是相互矛盾的，其详细的调节机制仍未得到证实。大多数先前的研究表明，灌溉主要通过影响土壤中 Cd 的生物利用度、pH 值和氧化还原电位（Eh）来调节水稻中 Cd 的积累，很少有报道关注氧（O）在调节水稻 Cd 耐受性或积累的生理机制中的作用。在这里，我们得出结论，灌溉通过调节 O 含量来影响土壤中 Cd 的生物利用度、pH 值和 Eh。此外，最近的研究还表明，灌溉调节的 O 还通过影响铁斑（IP）、径向氧气损失（ROL）屏障、水稻根细胞壁和质量流来影响水稻中 Cd 的积累。所有这些结果表明，O 是灌溉调节水稻中 Cd 积累的关键因素，不同灌溉实验的结果差异很大，是由于不同的根际 O 条件。本综述将有助于阐明灌溉对水稻中 Cd 积累的影响及其调节机制，并揭示 O 在这一过程中的作用。
