Effects of Organic Manure on Uptake and Distribution of Cadmium in Different Rice Genotypes Under Cadmium Stress
Two rice genotypes,Zhendao8%(0ryza saliva subsp. japonica) and Eryoul07(O. saliva subsp. indka), were used to study the effects of organic manure(OM) on the uptake and distribution of cadmium(Cd) in rice by two years pot experiments with two-factor random block design. Two Cd treatments were natural soil (background concentrations of soil cadmium 0.202 mg-kg"1) and artificial Cd-contaminat-ed soil (added 3.0 mg-kg"1 cadmium). Two fertilizer treatments were chemical fertilized300 kg N-hm'2) and chemical fertilizer(300 kg N-hm"2)+0M( 1.96 g'kg"1 dried soil). The results showed that Cd concentration in various organs of plant and distribution ratio of cadmium in root increased significantly under cadmium stress (3.0 mg-kg"'), while the distribution ratio of cadmium in panicle decreased. OM had no significant effects on Cd concentration in vegetative organs of the treatments with natural soil, and slightly decreased that in panicle. However, OM could reduce the Cd concentration in root, bran and milled rice, increase the distribution ratio of cadmium in root, and decrease that in panicle under cadmium stress. For panicle, the distribution ratio of cadmium in milled rice was also partially decreased with OM treatment under cadmium stress. Therefore it is suggested that OM might significantly decrease the Cd concentration in milled rice by reducing available Cd in the soil and inhibiting Cd transportation from root to above-ground and above-ground to milled rice. Furthermore, the effects of organic manure in two different rice genotypes were different.
ricecadmiumorganic manurecadmium uptakedistribution law of cadmium
国家科技期刊平台
NSTL
万方数据
维普
