Affiliations: Department of Environmental and Safety Engineering,
Jiangsu Polytechnic University, Changzhou 213016, China | Agricultural College, Yangzhou University, Yangzhou
225009, China | Changzhou Agricultural Bureau, Changzhou 213001,
China | Courcher Institute for Environmental Sciences and
Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong,
China
Abstract: In order to understand the mechanisms on the variation between rice
cultivars in Cd uptake and accumulation, two pot soil experiments were
conducted with typical rice cultivars that varied greatly in soil Cd uptake.
The experiments with six rice cultivars showed that the root oxidation
abilities of rice differed with rice cultivars and also with types of the
cultivars, the cultivars with indica consanguinity were significantly higher
than the cultivars with japonica consanguinity. Root oxidation abilities of the
rice cultivars correlated positively and significantly (P<0.01) with their
Cd concentrations and Cd quantity accumulations in rice plants. The experiments
with two rice cultivars showed that significant differences also existed
between the two cultivars in pot soil redox potentials, which of Shan you 63
(higher soil Cd accumulator) were significantly higher than that of Wu yun jing
7 (lower soil Cd accumulator) under different soil Cd levels, but the degrees
of the differences varied with soil Cd levels. The differences were larger
under soil Cd treatments than the control. The results indicate that root
oxidation ability, especially in Cd contaminated soil, is one of the main
mechanisms which dominate Cd uptake and accumulation by rice plant.
