硒通过提高水稻根系的径向氧损失来增强铁膜形成，从而减少水稻（Oryza sativa L.）对镉的积累。
Selenium enhances iron plaque formation by elevating the radial oxygen loss of roots to reduce cadmium accumulation in rice (Oryza sativa L.).
作者信息
Huang Gaoxiang, Ding Changfeng, Li Yushan, Zhang Taolin, Wang Xingxiang
机构信息
Ministry of Education's Key Laboratory of Poyang Lake Wetland and Watershed Research, School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China; Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
出版信息
J Hazard Mater. 2020 Nov 5;398:122860. doi: 10.1016/j.jhazmat.2020.122860. Epub 2020 May 17.
The inhibition of cadmium (Cd) absorption by selenium (Se) in rice may be associated with iron plaque (IP) formation, but the driving mechanisms are still unclear. This study investigated the effects of Se on the growth, oxidative toxicity, radial oxygen loss (ROL), IP formation, and Cd absorption of rice exposed to Cd. The results of this study showed that Cd stress elevated the levels of O- and HO and depressed superoxide dismutase (SOD) and catalase (CAT) activities. The maximum ROL and IP were reduced by 43.3 % and 74.5 %, respectively. However, Se alleviated Cd toxicity by stimulating SOD and CAT activities by scavenging O- and HO and enhancing the ROL profiles. Under culture conditions without Fe, Se had no impact on the total Cd levels in rice (T). However, with the addition of Fe, T was significantly reduced by 23.3 % due to the enhancement of IP formation by Se. These results indicated that Se can reduce Cd accumulation in rice in the presence of Fe treatments. However, Se just alleviated Cd toxicity in the absence of Fe treatments. The enhancement of ROL was a potential reason for the elevated IP formation induced by Se.
水稻中硒（Se）对镉（Cd）吸收的抑制作用可能与铁膜（IP）的形成有关，但其驱动机制仍不清楚。本研究调查了硒对暴露于镉的水稻生长、氧化毒性、径向氧损失（ROL）、铁膜形成及镉吸收的影响。本研究结果表明，镉胁迫提高了超氧阴离子（O⁻）和过氧化氢（H₂O₂）水平，降低了超氧化物歧化酶（SOD）和过氧化氢酶（CAT）活性。最大径向氧损失和铁膜分别降低了43.3%和74.5%。然而，硒通过清除超氧阴离子和过氧化氢来刺激超氧化物歧化酶和过氧化氢酶活性，并增强径向氧损失，从而减轻镉毒性。在无铁培养条件下，硒对水稻总镉含量（T）没有影响。然而，添加铁后，由于硒增强了铁膜的形成，总镉含量显著降低了23.3%。这些结果表明，在铁处理存在的情况下，硒可以减少水稻中镉的积累。然而，在无铁处理的情况下，硒只是减轻了镉毒性。径向氧损失的增强是硒诱导铁膜形成增加的一个潜在原因。
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