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Growth and nutritional element absorption of different rice genotypes under cadmium stress.

CHEN Jing-du, HE Li, XU Ke, DAI Qi-gen**, GUO Bao-wei, ZHANG Hong-cheng, HUO Zhong-yang, WEI Hai-yan   

  1. (1Innovation Center of Rice Cultivation Technology in Yangtze Valley, Ministry of Agriculture/Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, Jiangsu, China; 2Yangzhou City of Agricultural Products Quality Supervision and Inspection Center, Yangzhou 225009, Jiangsu, China)
  • Online:2013-12-10 Published:2013-12-10

Abstract: A pot experiment was conducted to study the effect of Cd on growth and absorption of Ca, Mg, P, and K of five different rice genotypes (Xiushui 63, Yongyou 8, Yangdao 6, Liangyoupeijiu and Shanyou 63). Cd was added into soil at two levels, i.e. 0 (CK) and 25 mg·kg-1. The result showed that the yield, panicle number and filled spikelet rate reduced significantly under Cd stress, but the reduction of grain weight was not significant. The effect of Cd stress on restraining the production of biomass mainly occurred in the early period, and weakened gradually during the growing process. The Cd effect was different among the different rice genotypes. The growth of Shangyou 63 and Xiushui 63 was less affected by Cd while the growth of Liangyoupeijiu, Yongyou 8 and Yangdao 6 was affected a lot. The effect of Cd stress on the absorption of mineral nutrients in different aboveground organs was also observed. When exposed to Cd stress, the absorption of K, P and Mg was lowered, but the absorption of Ca was increased. In addition, under Cd stress the distribution and accumulation of Ca, Mg, P and K in different aboveground organs was also affected to variable extents in the different rice genotypes. Compared with CK, the increase in Ca concentration in the Cd-tolerant variety was more than that of the Cd-sensitive variety, and such a phenomenon was not observed for Mg, P and K. This indicated that the resistance of rice to Cd may be related to Ca metabolism.