中文摘要：

镉（Cd）污染、紫外（UV-B）辐射增强及2者复合胁迫对大豆（Glycine max）生长及根、叶片中果胶酶（PG）和纤维素酶（Cx）活性影响的研究表明,Cd、UV-B单独还是复合胁迫对大豆株高及地上部干、鲜重都有明显的抑制作用;UV-B胁迫明显抑制根的伸长生长,复合胁迫对大豆根生长略有促进作用,但降低地下部干鲜重。Cd连续处理6d明显抑制叶片中PG和Cx活性,UV-B及复合处理6 d降低叶片中Cx活性;复合处理3 d根系中PG和Cx活性呈现增高趋势,但UV-B和Cd单独处理未引起酶活性的显著改变。结果表明Cd、UV-B辐射增强及复合胁迫对细胞壁酶活性的影响与植物生长密切相关。

英文摘要：

It investigates the changes in activities of pectin polygalacturonase（PG） and Cellulase（Cx） of soybean exposed to Cd,enhanced UV-B radiation and combination of Cd and UV-B radiation（FH）.The results showed that different treatments（Cd,UV-B and FH） inhibited seeding hight,dry and fresh weight;UV-B radiation could decrease elongation of root;FH stress slightly increased elongation of root but decreased dry and fresh weight of roots.The activites of PG and Cx in leaves were inhibited after exposed to Cd for 6 d,and the actity of Cx in leaves was inhibited after exposed to UV-B and FH for 6 d;FH stress（3 d） promoted activites of PG and Cx in roots while Cd or UV-B alone did not change activities of PG and Cx.The results also indicated that Cd,enhanced UV-B radiation and combination of Cd and UV-B could alter cell wall degrading enzymes activities,in turn alter plant growth.