利用PEG6000模拟研究干旱胁迫对褐飞虱取食和产卵的影响

 在实验室条件下，以感虫品种TN1、抗虫品种IR36和抗旱品种旱优3号为材料，采用聚乙二醇6000（PEG6000）模拟干旱处理水稻植株，研究干旱胁迫对褐飞虱取食和产卵的影响。结果表明，在同一水稻品种上，褐飞虱雌成虫在稻株上数量随着PEG6000浓度的上升而显著减少（P<0.001），而褐飞虱若虫在不同PEG6000浓度处理的水稻植株上数量无显著差异（P=0.093）。褐飞虱雌成虫在48 h内的蜜露分泌量和在稻株上72 h内的产卵量均与PEG6000浓度呈显著负相关。在感虫品种TN1上，褐飞虱若虫在不同浓度PEG6000处理稻株上的分布无显著差异；而在抗旱品种旱优3号和抗虫品种IR36上，随着PEG6000浓度的上升，水稻基部的褐飞虱若虫数量明显增多。在TN1和旱优3号上，褐飞虱雌成虫蜜露分泌量随PEG6000浓度上升而显著减少；而在IR36上，褐飞虱雌成虫在不同浓度PEG6000处理水稻植株上的蜜露分泌量均很少且无显著差异。

Feeding Behavior and Oviposition Preference of Brown Planthoppers, Nilaparvata Lugens, on Different Rice Varieties under Drought Stress Stimulated by Polyethylene Glycol (PEG6000)

The feeding behavior and oviposition preference of brown planthoppers (BPH), Nilaparvata lugens Stl, on rice varieties TN1 (susceptible), IR36 (with resistant gene bph2), Hanyou 3 (drought tolerant) were determined under drought stress simulated with polyethylene glycol (PEG6000) in laboratory. In the choice test, the percentage of BPH female adult on rice plants under different concentrations of PEG6000 decreased significantly with the rising PEG6000 concentration (P<0.001).However, no marked difference in the percentage of BPH nymph was found (P=0.093). The number of  BPH eggs   per  plant  within 72 h was negatively correlated with the concentration of PEG6000 on TN1 and IR36 (P=0.001 and P=0.008, respectively). On the rice plants of IR36 and Hanyou 3, BPH nymph tended to move from upper middle to basal part of leaf sheath when the PEG6000 concentration increased. However, it didn’t happen on TN1. The amount of honeydew per female adult within 48h reduced on TN1 and Hanyou 3 with the increasing concentration of PEG6000, while on IR36 it was very low and no significant difference was found under different concentrations of PEG6000.