Scholarlink

Purpose <p>The heavy metal cadmium (Cd) poses a risk to human health via the food chain. Uptake of Cd by roots and its redistribution in vegetative organs, particularly at stem nodes during grain filling, are crucial factors influencing its accumulation in grains. Consequently, a thorough investigation of the Cd characteristics accumulation in vegetative organs is significantly beneficial for understanding the mechanisms behind genotype differences and for developing remediation strategies in rice fields.</p> Methods <p>A pot experiment was conducted to investigate soil Cd stress by adding 67 mmol L⁻¹ of Cd(NO<sub>3</sub>)<sub>2</sub>·4H<sub>2</sub>O, utilizing two Indica and two Japonica rice cultivars. The differential mechanisms of Cd accumulation were systematically elucidated through the assessment of remobilization activation capabilities, which include subcellular distribution and chemical forms of Cd in roots and first nodes. Additionally, the Cd storage capacities of grain protein components and the differences in Cd fractions within the rhizosphere soil were examined.</p> Results <p>Under Cd stress soil, the yield of Indica rice varieties decreased more than that of Japonica rice, reaching 24.04%. The Cd concentrations in the first nodes, leaves, and roots of those rice varieties exhibited varying degrees of increase, with the most notable rise occurring in the first node. In comparison to Japonica rice, the proportions of soluble Cd, as well as inorganic Cd (F<sub>E</sub>-Cd) and water-soluble Cd (F<sub>W</sub>-Cd) in the first node and roots of Indica rice were significantly higher. Furthermore, the accumulation and increase of Cd in globulin, prolamin, and glutelin in brown rice were greater in Indica rice than in Japonica rice. After the harvest of mature rice, the concentrations of various Cd fractions in the rhizosphere soil of Indica rice were also lower than those in Japonica rice, exhibiting a significant negative correlation with the Cd concentration in brown rice.</p> Conclusions <p>Under Cd stress soil, Indica rice exhibited a greater capacity for Cd redistribution and binding of grain protein components compared to Japonica rice, leading to a significant accumulation of Cd in Indica rice grains.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Differences in Cd Accumulation between Indica and Japonica Rice: Comparative Analysis from the Remobilization and Protein Components Accumulation

  • 期刊论文

  • 发表日期：

    2025年6月27日

查看全文
  • Zunxin Wang,
  • Chuanlan Fu,
  • Huicong Wang,
  • Kehui Zuo,
  • Youhao Jin,
  • Xumei Yang,
  • Ying Zhang,
  • Yang Li,
  • Xinhong Chen,
  • Feibing Wang

摘要

Purpose

The heavy metal cadmium (Cd) poses a risk to human health via the food chain. Uptake of Cd by roots and its redistribution in vegetative organs, particularly at stem nodes during grain filling, are crucial factors influencing its accumulation in grains. Consequently, a thorough investigation of the Cd characteristics accumulation in vegetative organs is significantly beneficial for understanding the mechanisms behind genotype differences and for developing remediation strategies in rice fields.

Methods

A pot experiment was conducted to investigate soil Cd stress by adding 67 mmol L⁻¹ of Cd(NO3)2·4H2O, utilizing two Indica and two Japonica rice cultivars. The differential mechanisms of Cd accumulation were systematically elucidated through the assessment of remobilization activation capabilities, which include subcellular distribution and chemical forms of Cd in roots and first nodes. Additionally, the Cd storage capacities of grain protein components and the differences in Cd fractions within the rhizosphere soil were examined.

Results

Under Cd stress soil, the yield of Indica rice varieties decreased more than that of Japonica rice, reaching 24.04%. The Cd concentrations in the first nodes, leaves, and roots of those rice varieties exhibited varying degrees of increase, with the most notable rise occurring in the first node. In comparison to Japonica rice, the proportions of soluble Cd, as well as inorganic Cd (FE-Cd) and water-soluble Cd (FW-Cd) in the first node and roots of Indica rice were significantly higher. Furthermore, the accumulation and increase of Cd in globulin, prolamin, and glutelin in brown rice were greater in Indica rice than in Japonica rice. After the harvest of mature rice, the concentrations of various Cd fractions in the rhizosphere soil of Indica rice were also lower than those in Japonica rice, exhibiting a significant negative correlation with the Cd concentration in brown rice.

Conclusions

Under Cd stress soil, Indica rice exhibited a greater capacity for Cd redistribution and binding of grain protein components compared to Japonica rice, leading to a significant accumulation of Cd in Indica rice grains.