• 耕作栽培·生理生化 •

### 不同镉积累类型小麦各器官镉积累分布规律及机理分析

1. 1四川农业大学资源学院, 四川成都 611130
2泸州市农业农村局, 四川泸州 646000
• 收稿日期:2021-04-28 接受日期:2021-09-09 出版日期:2022-07-12 网络出版日期:2021-10-15
• 通讯作者: 张锡洲
• 作者简介:E-mail: fengyajj@163.com
• 基金资助:
四川省重大科技专项(2018SZDZX0029);国家重点研发计划项目(2018YFC1802605)

### Characteristics of cadmium accumulation and distribution in different organs of wheat with different cadmium-accumulating type

FENG Ya-Juan1(), LI Ting-Xuan1, PU Yong2, ZHANG Xi-Zhou1,*()

1. 1College of Resources, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
2Luzhou Municipal Bureau of Agriculture and Rural Affairs, Luzhou 646000, Sichuan, China
• Received:2021-04-28 Accepted:2021-09-09 Published:2022-07-12 Published online:2021-10-15
• Contact: ZHANG Xi-Zhou
• Supported by:
Major Science and Technology Project of Sichuan Province(2018SZDZX0029);National Key Research and Development Program of China(2018YFC1802605)

Abstract:

The study of cadmium accumulation and distribution characteristics in different organs of wheat with low Cd accumulation is helpful to clarify the mechanism of low Cd accumulation in grain, which is of great significance for cultivating wheat varieties with Cd safety. A pot experiment was conducted to clarify the characteristics of Cd accumulation and distribution in different organs of different Cd accumulating wheat materials at the late growth stages. The physiological characteristics of the key organs, namely node I and glume, were further explored. The results showed that there was significant difference of Cd accumulation and distribution between the two wheats at maturity stage. Cd concentrations in node I and glume of Mianmai 37 were significantly higher than those of Kangxiu 3816. The stage of from filling to maturity was the key period for Cd accumulation in node I and glume of the accumulation of Mianmai 37. In subcellular level, Cd in node I and glume of both wheat was mostly distributed in the cell wall, accounting for 70%-80%. The distribution ratio of the soluble fraction of Mianmai 37 node I was 18%, and that of Kangxiu 3816 was 15%. The distribution ratio of the soluble fraction of Mianmai 37 glume was 19%, which was 2.7 times that of Kangxiu 3816. More Cd was found to distribute in soluble faction in node I and glume of Mianmai 37 compared with Kangxiu 3816. There was no significant difference of GSH concentration in node I of the two wheats at filling stage. The PC1 and PC2 concentrations in node I of Mianmai 37 were significantly lower than those of Kangxiu 3816, while the PC3 and PC4 concentrations were significantly higher. The concentrations of GSH, PC1, PC2, PC3, and PC4 in the glume of Mianmai 37 were significantly higher than those of Kangxiu 3816. Cd retention in node I and the soluble fraction of glumes, as well as the great increase of NPT concentrations, contributed to low Cd accumulation in Mianmai 37. The present study investigates the mechanism of Cd retention in the key organs of wheat, which is of great significance to clarify the mechanism of Cd accumulation in wheat grains.