4.7 Article

Sulphur nutrition and iron plaque formation on roots of rice seedlings and their consequences for immobilisation and uptake of chromium in solution culture

期刊

PLANT AND SOIL
卷 462, 期 1-2, 页码 365-388

出版社

SPRINGER
DOI: 10.1007/s11104-021-04870-8

关键词

Rice (Oryza sativa L.); Chromium; Sulphur supply; Iron plaque; Bioaccumulation; Phytochelatin

资金

  1. National Key Research and Development Program of China [2016YFD0800400]
  2. NationalNatural Science Foundation ofChina [U1632134, 41877033]
  3. Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Science

向作者/读者索取更多资源

This study investigated the impact of sulfur on the chromium tolerance of rice plants and found that a moderate sulfur treatment can effectively reduce the bioavailability of chromium in rice shoots. The barrier capacity of iron plaque to chromium absorption in rice plants was found to be primarily influenced by the applied chromium concentration and the competition between chromium and sulfur at the absorbing sites.
Aims The contribution of sulphur (S)-induced responses to chromium (Cr) tolerance of rice plants is not yet fully elucidated. It is hypothesised that S nutrition mitigates the accumulation and toxicity of Cr through enhanced formation of iron plaque (IP) and S-containing chelators. This study aimed to investigate the responses of iron (Fe) and Cr availability and transfer in the hydroponic rice system to added S levels. Methods We explored the influence of S nutrition on Cr accumulation in rice under a combination of Cr (VI) (+Cr, -Cr) and S (0, 1.75, 3.5, 7 mM) treatments. Results S additions at rates of 1.75 and 3.5 mM gave the least decline in root and shoot growth of rice seedlings under Cr stress. Fe concentration in shoots was consistent with the level of Cr uptake. The subcellular distribution of Cr in roots and shoots differed with varying S supply levels. Our results also revealed that S treatment at a moderate level (3.5 mM) was more effective in suppressing the bioavailability of Cr in rice shoots than were the other levels. Conclusions S-induced reduction in shoot Cr concentration, particularly from 1.75 to 3.5 mM, was likely attributed to the enhanced biosynthesis of glutathione (GSH) and phytochelatins (PCs) in roots than the enhanced physical resistance of IP induced by S. The poor barrier capacity of IP to Cr absorption in rice plants primarily ascribed to the level of applied Cr concentration and partly to the competition between Cr and S at the absorbing sites.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据