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为明确干旱胁迫对稻虱缨小蜂Anagrus nilaparvatae Pang et Wang生态适应性的影响,采用不同浓度的聚乙二醇(polyethylene glycol,PEG)6000模拟干旱生境,研究了干旱胁迫对稻虱缨小蜂生长发育、繁殖的影响,并观察了稻虱缨小蜂对感虫品种TN1和抗虫品种IR36水稻上褐飞虱Nilaparvata lugens Stl卵的选择情况。结果表明,稻虱缨小蜂幼虫的发育历期随PEG6000浓度的升高而延长;成虫寿命则随着PEG6000浓度的升高而缩短,经20%PEG6000处理7 d后雌蜂寿命最短,在TN1和IR36水稻上分别为25.1 h和25.4 h;经20%PEG6000胁迫处理7 d后,在TN1、IR36水稻上稻虱缨小蜂的平均卵寄生量最低,分别为10.9粒和8.1粒。与20%PEG6000处理相比,稻虱缨小蜂对未经干旱胁迫处理水稻上的褐飞虱卵具有明显的选择性。研究表明,模拟干旱胁迫能降低稻虱缨小蜂生态适应性,且降低对褐飞虱卵的寄生力和选择性。
In order to clarify the effect of drought stress on the ecological adaptability of Anagrus nilaparvatae Pang et Wang, polyethylene glycol (PEG) 6000 was used to simulate the drought habitat, Growth and development, reproduction and the selection of Nilaparvata lugens St l eggs of Nilaparvata lugens (TNN) and insect pest TN1 and IR36 rice were observed. The results showed that the larvae development duration increased with the increase of PEG6000 concentration. The life span of adult larvae was shortened with the increase of PEG6000 concentration. The life span of female larvae was the shortest after treated with 20% PEG6000 for 7 d, And IR36 rice were 25.1 h and 25.4 h, respectively. After 20 d PEG6000 treatment for 7 days, the average egg parasitism was the lowest on the rice plants TN1 and IR36, 10.9 and 8.1, respectively. Compared with 20% PEG6000 treatment, B. tabaci had obvious selectivity to the brown planthopper eggs on rice without drought stress. Studies have shown that simulated drought stress can reduce the ecological adaptability of the louse lice, and reduce the parasitism and selectivity of the brown planthopper eggs.