不同辣椒品种镉吸收与转运的差异

采用水培方法研究2个辣椒品种在不同镉(Cd)水平(0、20、40 mg·L~(-1))下的生物量及根、茎、叶各部位Cd含量和转运差异。结果表明,当Cd浓度≤40 mg·L~(-1)时,辣椒生物量及Cd含量随着Cd浓度的增加而呈上升趋势。相同Cd水平下,辣椒各部位Cd含量表现为根茎叶。2个辣椒品种对Cd的积累和转运存在差异,PE30茎和叶中Cd含量较高,Cd转移系数和地上部Cd富集系数也高,可能存在果实Cd含量超标的风险。而PE3的Cd主要集中在根部,向地上部转移Cd的能力较差,属于高积累、低转运类型,可以在轻度Cd污染的地区种植。

Differences between Cadmium Uptake and Translocation among Different Pepper Varieties

Hydroponic experiment was conducted to study the effect of different Cd levels（0、20、40 mg·L^-1）on dry weight，Cd concentration of root，stem，leaf and Cd transport from root to shoot between 2 pepper varieties（PE3 and PE30）. The results showed that dry weight and Cd content increased with the increase of Cd level（C_Cd ≤ 40 mg·L^-1），and the tolerance to Cd of different pepper varieties was also different. Under the same Cd treatment，Cd concentrations of 2 pepper varieties were in the order of root ＞ stem ＞ leaf. Significantdifferences in Cd accumulation and translocation were observed between 2 pepper varieties. Cd concentration in the stems and leaves，and Cd translocation coefficient and shoot Cd enrichment coefficient of PE30 were higher，which might lead to the risk of excessive Cd in fruit. Root was the primary tissue of Cd accumulation in PE3，and the ability to transport Cd from root to shoot was poorer，so PE3 could be planted in Cd lightly contaminated soil.