铝胁迫对常绿杨生长状况及保护酶活性的影响

Effects of aluminum stress on growth conditions and protective enzyme activity in evergreen poplar

选取常绿杨为试验材料,研究酸性条件下铝胁迫对常绿杨生长状况及叶片保护酶活性的影响。结果表明,在酸性条件,铝浓度0.075 mmol·L-1胁迫下,常绿杨根茎叶的生物量及生长量均有小幅升高,叶片保护酶(SOD、CAT、POD)活性均升高。当铝浓度高于0.222 mmol·L-1时,常绿杨根茎叶的生物量及生长量均大幅下降,叶片保护酶活性也开始下降。铝胁迫对根茎叶生物量的影响为根>叶>茎。因此,酸性条件下,在铝毒害较轻微的情况下,常绿杨的生长并未受到明显的抑制,当铝浓度超过0.222 mmol·L-1时,保护酶活性受到抑制,常绿杨的生长状况最终受到了较为明显的抑制作用。

Evergreen poplar （Populus x euramericana ＇A-61/186＇ ） was selected as the test materials to investigate the effects of aluminum stress on its growth and leaf-protecting enzyme activity under acidic conditions. The results showed as follows. Under acidic conditions and aluminum concentration 0.075 mmol·L-1 stress, the biomass of roots and stems performed a slight increase in volume growth, while leaf protective enzymes （SOD, CAT, POD ） activities were increased. As aluminum concentrations higher than 0. 222 mmol·L-1, biomass growth of roots, shoots and leaves in evergreen poplar volume dropped significantly, and protective enzyme activity began to decline. Impact of aluminum stress on biomass was roots 〉 leaves 〉 stems. It has been concluded that under acidic conditions and minor aluminum toxicity, evergreen poplar growth has not been inhibited, but when the concentration of aluminum increased gradually and reached and exceeded 0.222 mtool·L-1, protective enzyme activity was inhibited and the growth of evergreen poplar was remarkably restrained.