The Key Period of Cadmium Accumulation in Rice

• Main Authors: PENG Ou, TIE Bo-qing, YE Chang-cheng, ZHANG Miao, LIU Xiao-li, WEI Xiang-dong, SUN Jian
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2017-05-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: rice; cadmium; solution culture; growth stage; accumulation rate
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2017/3/20170310.htm

It has important scientific value and practical significance to explore the characteristics of the cadmium accumulation in rice at different growth stages for safely producing rice. In this study, cadmium accumulation in rice at different growth periods, cadmium distribution in different parts of the rice and the intrinsic relationship between them were investigated by water culture experiment with low concentration of exogenous cadmium addition at different growth stages of rice. The cadmium could accumulate at a relatively high content at booting and heading stage of rice after exposure to exogenous cadmium indicating that the booting and heading stage were the key period of cadmium accumulation in rice. At the heading stage, the cadmium stress had the most significant effect on the cadmium accumulation rate of rice, reaching a maximum of 3.41 μg·clump^-1· d^-1. The contributions of cadmium stress to the cadmium accumulation in the booting and heading stage were higher. In those two stages, the contributions rate of the Zhong Jiazao 17 was 40.51%, 31.66% and the Xiang Wanxian 13 was 37.97%, 35.46% respectively. The study could provide valuable implications for control of cadmium pollution in rice field.