The Role of Node Restriction on Cadmium Accumulation in the Brown Rice of 12 Chinese Rice (Oryza sativa L.) Cultivars

• Published in: Journal of agricultural and food chemistry 2017-11, Vol.65 (47), p.10157-10164
• Main Authors: Huang, Gaoxiang, Ding, Changfeng, Guo, Fuyu, Li, Xiaogang, Zhou, Zhigao, Zhang, Taolin, Wang, Xingxiang
• Format: Article
• Language: English
• Subjects: Cadmium - analysis; Cadmium - metabolism; China; Oryza - chemistry; Oryza - classification; Oryza - metabolism; Plant Leaves - chemistry; Plant Leaves - metabolism; Plant Roots - chemistry; Plant Roots - metabolism; Plant Shoots - chemistry; Plant Shoots - metabolism; Soil Pollutants - analysis; Soil Pollutants - metabolism
• ISSN: 0021-8561; 1520-5118
• DOI: 10.1021/acs.jafc.7b03333

For selection or breeding of rice (Oryza sativa L.) cultivars with low Cd affinity, the role of node Cd restriction on Cd accumulation in brown rice was studied. A pot experiment was conducted to investigate the concentration of Cd in different sections of 12 Chinese rice cultivars. The results indicated that the Cd accumulation in the brown rice was mainly dependent on the root or shoot Cd concentration. Among the cultivars with nearly equal shoot Cd concentrations, Cd accumulation in brown rice was mainly dependent on the transport of Cd in the shoot. However, the Cd transport in the shoot was significantly restricted by the nodes, especially by the first node. Furthermore, the area of the diffuse vascular bundle in the junctional region of the flag leaf and the first node was a key contributor to the variations in Cd restriction by the nodes.