Jiang Dun, Yan Shanchun
Northeast Forestry University, School of Forestry, Harbin, 150040, China.
Ecotoxicology. 2017 Dec;26(10):1305-1313. doi: 10.1007/s10646-017-1855-7. Epub 2017 Sep 26.
In order to investigate the effects of heavy metal stress on woody plant defense against phytophagous insects, we studied development and reproduction traits of the gypsy moth, Lymantria dispar that were separately fed with leaves plucked from poplar seedlings (Populus alba berolinensis) grown in either non-contaminated soil (control), Cd-contaminated soil (1.5 mg/kg), Zn-contaminated soil (500 mg/kg) or Pb-contaminated soil (500 mg/kg). The results showed that feeding on Cd or Pb stressed poplar leaves significantly decreased L. dispar larval weights, body lengths and head capsule widths, pupal weights and female fecundity, and delayed the duration of larval development. Similar effects from the Zn stressed poplar leaves were also observed on all the above mentioned variables except male pupal weight and larval development duration that showed no differences from the control. Cd, Zn, or Pb stressed poplar leaves had no significant effects on L. dispar larval survival, pupation and emergence rates; in fact, both larval survival and pupation rates reached 100%. These results suggest that Cd, Zn or Pb stress in P. alba berolinensis might help the trees defend against the defoliator, however; L. dispar may in turn have an effective detoxification mechanism for lessening the effects of plant-mediated defenses and heavy metals in leaves on larval survival, pupation and eclosion.
为了研究重金属胁迫对木本植物抵御植食性昆虫的影响，我们研究了分别取自在未受污染土壤（对照）、镉污染土壤（1.5毫克/千克）、锌污染土壤（500毫克/千克）或铅污染土壤（500毫克/千克）中生长的杨树幼苗（银白杨）叶片饲养的舞毒蛾的发育和繁殖特性。结果表明，取食镉或铅胁迫的杨树叶片显著降低了舞毒蛾幼虫的体重、体长和头壳宽度、蛹重和雌虫繁殖力，并延长了幼虫发育持续时间。除雄蛹体重和幼虫发育持续时间与对照无差异外，锌胁迫的杨树叶片对上述所有变量也有类似影响。镉、锌或铅胁迫的杨树叶片对舞毒蛾幼虫的存活率、化蛹率和羽化率没有显著影响；事实上，幼虫存活率和化蛹率均达到100%。这些结果表明，银白杨中的镉、锌或铅胁迫可能有助于树木抵御食叶害虫，然而，舞毒蛾可能相应地具有有效的解毒机制，以减轻植物介导的防御和叶片中的重金属对幼虫存活、化蛹和羽化的影响。
