添加Cd2+对大豆生长发育及逆境生理指标的影响

通过河潮土和红壤2种土壤加Cd^2＋盆栽试验，研究了不同浓度Cd^2＋对大豆生长发育及几种逆境生理指标的影响。结果表明：2种土壤加Cd^2＋处理均可抑制大豆的伸长生长，促进大豆叶片脱落酸（ABA）和脯氨酸（PRO）的积累，对过氧化物酶（POD）活性的影响在红壤上表现为促进作用，河潮土则表现为低浓度下的抑制作用和高浓度下的促进作用。随着Cd^2＋胁迫时间的增加。叶片ABA含量和POD活性增加。PRO含盘则下降，表明ABA和POD对Cd^2＋胁迫持续响应的时间较长，可选择作为大豆Cd^2＋污染胁迫的诊断指标。红壤加Cd^2＋处理，对大豆生长发育的影响大于相同浓度Cd^2＋处理的河潮土．表明其对镉污染的环境容量低于河潮土。

Metabolic Responses of Soybean (Glycine max) to Cadmium

A pot experiment was conducted to study the metabolic responses of soybean to cadmium in two types of soils(alluvial soil and red soil) in Hunan.All physiological indexes were mensurated in the leave of soybean.The results investigated that the growing of soybean was inhibited in all treatments with cadmium.The synthesis of abscisic acid(ABA) and proline(PRO) were simulated in all treatments with cadmium.Peroxidase(POD) activities of soybean growing in red soil with cadmium were stimulated.In the treatments with alluvial soil,POD activities were inhibited with the lower Cd~(2 ) concentrations and stimulated with the higher Cd~(2 )concentrations.ABA and POD were the most sensitive indicators for soybean under cadmium exposure.The total biomass of soybean growing in red soil was less than in alluvial soil.In conclusion,red soil with cadmium has a strong influence on the growth of soybean than alluvial soil.