Abstract:

In order to study the influence of different Zinc (Zn) levels on physiological characteristics, Zn accumulation in grains of rape, the plant growth, physiological characteristics, concentration and accumulation of Zn in grain for five varieties (LPJCZ, ENW, SYKC, NTHYC and H33) were compared at Zn (0, 1.0, 5.0, 10.0 and 20.0 mg/kg) treatments in pot experiments. The dry weights of roots, leaf, straw, grain and plant, physiological characteristics, concentration and accumulation of Zn significantly differed among different varieties and Zn levels. The activities of net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), and dry weights of plant, straw, leaf and grain increased at Zn≤5.0 mg/kg. Zinc concentration of roots, straw and leaf for five varieties, and grain Zn concentration for LPJCZ and SYKC increased by increasing of Zn, but grain Zn accumulation for five varieties, and grain Zn concentration for ENW, NTHYC and H33 increased at Zn≤5.0 mg/kg, then decreased at Zn>5.0 mg/kg. The high concentration and accumulation of Zn in grain were observed in ENW by 172.34 mg/kg (2.932 mg/pot) and 164.10 mg/kg (2.575 mg/pot) at 5.0 and 10.0 mg/kg Zn treatments.