重金属镉、铅胁迫对不同品种茭白生长的影响

Effect of Cadmium and Lead on the Growth of Different Cultivars of Zizania latifolia

以茭白的单季茭品种蒋墅茭和双季茭品种葑红早为试材,在苇末基质和土壤2种栽培方式下添加不同浓度的Cd2+,Pb2+胁迫处理,测定了茭白生长过程中株高、叶面积、分蘖等形态指标的变化。研究结果表明,低浓度Cd2+,Pb2+胁迫能促进两茭白品种株高、叶面积的增加,但均随Cd2+,Pb2+处理浓度的进一步增加而下降;茭白的分蘖数表现为随Cd2+,Pb2+处理浓度的增加而呈持续下降的变化趋势。不同栽培介质间以苇末基质栽培处理时茭白的株高、叶面积、分蘖数同比高于土壤栽培。品种间以葑红早的株高、叶面积同比高于蒋墅茭,而分蘖数则低于蒋墅茭。

Changes of plant height, leaf area and tiller number of Zizania latifolia were studied with single-harvested cuhivar Jiangshujiao and double-harvested cultivar Fenghongzao which cultured in reed residue substrate and in Soil treated with different Cd^2＋ and Pb^2＋ concentrations. The results showed that, the plant height and leaf area increased under lower concentration of Cd^2＋ and Pb^2＋, but significantly decreased under higher concentration of Cd^2＋ and Pb^2＋, while tiller number descended with increased concentration of Cd^2＋ and Pb^2＋. The plant height, leaf area, tiller number in reed residue substrate were higher than those in soil. The plant height and leaf area of Fenghongzao were higher than those of Jiangshu, but tiller number was lower.