关键词: 甜糯玉米（Zea mays L.）, 子粒镉积累, 外源镉, 富集系数, Cd低积累型材料

Abstract: In order to screen the sweet glutinous maize （Zea mays L.） with low-Cd accumulation in grains under different soil cadmium concentrations stress, a pot experiment was conducted to study the difference of the Cd accumulation in grains by 45 sweet glutinous maize materials. 2 soil cadmium concentrations were set, namely C1 （1.3 mg/kg）, C2 （3.2 mg/kg）, and the soil without exogenous-Cd was taken as the control （CK）. The results showed that the Cd concentrations in sweet glutinous maize grains increased with the increase of Cd concentration in soil, and there were significant differences among the 45 sweet glutinous materials （P<0.01）. The enrichment coefficients of Cd in grains of all maize materials were less than 1 under different Cd concentrations. The cluster analysis showed that 15 materials exhibited grain low-Cd accumulation characteristics under different Cd concentrations, and the Cd contents in the grain of S18, S29, S30, S36 and S44 were lower than the National Food Safety Standard （0.1 mg/kg）. Thus, these 5 materials with low-Cd accumulation in grains could be used as parent materials, providing germplasm resources for the cultivation of Cd-safe varieties in sweet glutinous maize.

Key words: sweet glutinous maize （Zea mays L.）, Cd accumulation in grains, exogenous cadmium, enrichment coefficient, low-Cd accumulation material