摘要:
通过盆栽实验方法研究了13种茄子幼苗对镉(Cd)积累与耐性的品种间差异。结果表明,这些茄子幼苗根及地上部Cd含量均随土壤中外加Cd的量的增加而提高。品种间存在着显著差异(P < 0.05),其中Cd含量最高品种根部和地上部的Cd含量分别为Cd含量最低品种的2.1、2.4倍(2 mg·kg-1 Cd处理组)和1.5、1.6倍(4 mg·kg-1 Cd处理组)。不同品种幼苗对Cd的富集系数均大于1,表现出较强的富集能力。但转运系数均小于1,Cd从根部向地上部转移能力较弱,大多数品种间差异不大。当Cd添加量为2 mg·kg-1时,只有绿龙长茄地上部生物量显著下降(P < 0.05)。当Cd添加量提高到4 mg·kg-1时,6个品种地上部生物量显著下降(P < 0.05),这些品种对Cd的耐性较弱。综合评价,辽茄三号对Cd积累的含量最低,富集系数和转移系数也较低,对Cd具有较强的耐性,具有Cd低积累特征。
Abstract:
Pot culture experiment was used to compare the differences of cadmium (Cd) accumulation and tolerance among 13 eggplant cultivar seedlings. Results showed that Cd contents in the roots and shoots of all plants enhanced with the increasement of Cd contents in soil. There was a significant difference (P < 0.05) in Cd concentration among different eggplant cultivars. Cd contents in roots and shoots of the cultivar with the highest Cd content were 2.1 and 2.4 times in treatment T1 (2 mg·kg-1 Cd), and 1.5 and 1.6 times in treatment T2 (4 mg·kg-1 Cd) of the one with the cowest Cd content. The enrichment factors of all plants were all higher than 1, indicating the very strong accumulation capacity of eggplant. However, the translocation factors of all cultivars were lower than 1. The differences of translocation factors among most cultivars did not show significant difference (P < 0.05), expressing low translation capacity of Cd from root to shoot. Under the condition of 2 mg·kg-1 Cd added in soil, only the shoot biomass of Lvlongchangqie significantly decreased (P < 0.05) compared to the control. When 4 mg·kg-1 Cd was added in soil, the shoot biomasses of 6 cultivars significantly decreased (P < 0.05), indicating their weak tolerance to Cd. Cd concentrations in the roots and shoots of Liaoqie 3 were the lowest among different eggplant cultivars. Its enrichment factor and translocation factor were lower either. Accordingly, Liaoqie 3 showed strong tolerance to Cd and low Cd accumulation characteristics.
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