番茄光合荧光特性及其镉吸收对土壤镉污染的响应

Response of photosynthetic characteristics and fluorescence parameters of tomato to Cd in soil

为探究番茄(Lycopersicon esculentum Mill.)对镉污染的修复潜力,采用土壤盆栽试验方法,研究了在土壤镉施加含量为2,4,8,16,24,48mg/kg条件下,番茄生长、光合荧光特性及其镉吸收响应特点.结果表明,在土壤中施加镉含量大于8mg/kg时,番茄叶片叶绿素含量、光合性能和荧光参数,以及生物量显著低于没有施加镉的对照(P<0.05),表现出较强的Cd敏感性.同时,在所有镉处理中,番茄叶片对镉的富集系数(2.48~6.60)和转移系数(1.21~3.90)均大于1,表现出较强的富集能力,但经计算其土壤Cd去除率较低.因此,供试番茄品种是Cd的敏感作物,对土壤镉污染修复的潜力较小.

In order to explore the potential of tomato(Lycopersicon esculentum Mill.)for remediation of Cd contaminated soil,the response characteristics of tomato growth,photosynthetic fluorescence and Cd uptake were studied under the conditions of 2,4,8,16,24 and 48mg/kg Cd added in soil by pot experiment.The results showed that the chlorophyll content,photosynthetic performance,fluorescence parameters and biomass of tomato were significantly lower(P<0.05)than the control when Cd concentration was more than 8mg/kg added in soil,indicating a strong Cd sensitivity.At the same time,in all Cd treatments,the enrichment factor(2.48~6.60)and translocation factor(1.21~3.90)of tomato leaves were greater than 1,showing strong enrichment ability,but the soil Cd removal rate was low.Therefore,the tested tomato variety was sensitive to Cd and had little potential for remediation of Cd contaminated soil.