欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

锌、苯并\[a\]芘及其复合胁迫对小麦幼苗生长及抗氧化酶的影响

李悦,谢诗,陈忠林,徐苏男,张利红**   

  1. (辽宁大学环境学院, 沈阳 110036)
  • 出版日期:2013-02-10 发布日期:2013-02-10

Impacts of zinc, benzo\[a\]pyrene, and their combination on the growth and antioxidant enzymes activities of wheat (Triticum aestivum L.) seedlings.

LI Yue, XIE Shi, CHEN Zhong-lin, XU Su-nan, ZHANG Li-hong**   

  1. (School of Environment, Liaoning University, Shenyang 110036, China)
  • Online:2013-02-10 Published:2013-02-10

摘要: 采用水培方法研究了锌(Zn)、苯并\[a\]芘(B\[a\]P)及其复合污染对小麦(Triticum aestivum L.)幼苗生长和超氧化物歧化酶(SOD)、过氧化物酶(POD)活性和过氧化氢酶(CAT)活性的影响。结果表明:与对照组相比,各处理小麦生物量下降,株高降低,300 mg·L-1 ZnSO4和54 mg·L-1B\[a\]P的复合胁迫使小麦幼苗地上及地下干重分别下降364%和51.7%,明显高于单一胁迫。各处理SOD活性呈现升高降低升高趋势,且低于对照,POD、CAT活性先升高再降低,复合胁迫POD活性最高,CAT活性最低。Zn、B\[a\]P及其复合胁迫下,小麦幼苗的生长受到了一定的抑制,且以复合胁迫最为显著。Zn、B\[a\]P联合作用的结果表现为协同作用。

关键词: 黄土丘陵, 半干旱地区, 人工沙棘林, 水土保持, 土壤水分

Abstract: A hydroponic experiment was conducted to study the impacts of zinc (Zn), benzo\[a\]pyrene (B\[a\]P), and their combination on the growth and antioxidant enzymes activities of Triticum aestivum seedlings. As compared with CK, the biomass and plant height of the seedlings under the stresses of Zn, B\[a\]P, and their combination decreased. Under the combined stress of 300 mg·L-1 of Zn and 54 mg·L-1 of B\[a\]P, the above and underground dry mass decreased by 36.4% and 51.7%, respectively, and the decrements were obviously larger than those under single stress. In all treatments with Zn and/or B\[a\]P, the superoxide dismutase (SOD) activity presented a trend of increasedecreaseincrease and was lower than that in CK, whereas the peroxidase (POD) and catalase (CAT) activities decreased after an initial increase. Under combined stress, the POD activity was the highest, while the CAT activity was the lowest. Under the single and the combined stress, the seedling’s growth was inhibited, being most obvious under combined stress. The joint action of Zn and B\[a\]P was of synergistic effect.