UV-B辐射与酸雨复合胁迫对油菜幼苗生长的影响

Effect of UV- B Radiation and Acid Rain on Rape Seedling Growth

采用水培实验方法研究了紫外辐射(UV-B,280～320nm)与酸雨(AR)单一和复合胁迫对油菜幼苗生长的影响。实验表明,单一胁迫与复合胁迫对油菜幼苗生长有不同程度的抑制作用。在单一紫外辐射胁迫下(T1,T2),地上部分的降幅为11.8%～44.8%、21.7%～50.4%,地下部分的降幅为2.7%～34.7%、2.8%～42.8%。单一酸雨胁迫下(AR1,AR2),降幅依次为6.2%～17.7%、3.7%～10.9%,1.6%～23.7%、0.6%～10.9%。复合胁迫下降幅明显低于单一胁迫,地上部分的降幅为24.7%～50.5%(AR1+T1)、18.5%～49.2%(AR2+T1)、32.3%～67.9%(AR1+T2)、24.4%～66.5%(AR2+T2)。地下部分的降幅依次为3.6%～46.2%、3.5%～43.1%、4.0%～52.9%、3.7%～49.7%。

Responses of rape seedling growth to single and combined stress of elevated ultraviolet- B radiation (UV- B, 280～ 320 nm) and acid rain were studied. The results showed that the growth of rape seedling was restrained in varying degrees under alone stress and combined stress. Under UV- B radiation stress alone (T1, T2), the decreasing degrees of growth index were about 11.8% ～ 44.8% , 21.7% ～ 50.4% in the aboveground parts and about 2.7% ～ 34.7% , 2.8% ～ 42.8% in the underground parts. Under acid rain stress alone(AR1,AR2), the ordinal decreasing degrees of index were 6.2% ～ 17.7% , 3.7% ～ 10.9% , 1.6% ～ 23.7% and 0.6% ～ 10.9% respectively. The decreasing degrees of growth indexes of rape seedling under combined stress were significantly higher than those under single stress, Which were 24.7% ～ 50.5% (AR1+ T1), 18.5% ～ 49.2% (AR2+ T1), 32.3% ～ 67.9% (AR1+ T2), 24.4% ～ 66.5% (AR2+ T2) in the aboveground and 3.6% ～ 46.2% , 3.5% ～ 43.1% , 4.0% ～ 52.9% and 3.7% ～ 49.7% in the underground.