不同品种燕麦对镉胁迫响应的差异性研究

利用实验室水培模拟试验,研究了轻度镉胁迫条件下10个燕麦品种生长及吸收积累镉的差异性。结果表明,经5μmol·L-1的镉处理后,供试燕麦品种的株高、根长、地上部与地下部生物量、叶绿素含量、类胡萝卜素含量均出现不同程度的下降,不同品种间存在明显的差异,有的甚至达到极显著水平;不同品种燕麦对镉的吸收与积累也存在明显差异;燕麦镉的吸收转运与耐性没有直接的联系。按照镉胁迫下燕麦耐镉性和镉含量的冠根比进行聚类分析,可将10个品种分为4类:①镉转运少且耐性强;②转运多但耐性强;③转运多且耐性弱;④转运较少但耐性弱。其中品5号地上部生长抑制率最小,并且镉含量、镉转运量较少,表现出较强的耐镉性,在轻度镉污染土壤上种植品5号有利于降低镉污染对人类健康的风险。

Responses of Oat Cultivars to Cadmium Stress

A hydroponic experiment was conducted to investigate absorption and accumulation of cadmium as well as its effects on the growth of ten oat cultivars.Our results showed that shoot and root length,biomass,chlorophyll and carotenoid contents of the oat cultivars significantly decreased after cadmium treatment.The toxicity of cadmium was different among oat cultivars.There were significant differences in both Cd content and accumulation.There were no direct relationships between absorption,translocation and to...