当前位置: X-MOL 学术Biocontrol › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Non-consumptive effects of Encarsia formosa on the reproduction and metabolism of the whitefly Bemisia tabaci
BioControl ( IF 2.5 ) Pub Date : 2021-06-09 , DOI: 10.1007/s10526-021-10099-2
Ze-Yun Fan , Zhan-Peng Zhu , Jing Peng , Xin-Yi Chen , Zi-Tong Lu , Hui-Peng Pan , Bao-Li Qiu

The impact of predatory or parasitic natural enemies on their pest prey or hosts arises not only through consumption but also through non-consumptive effects. Multiple studies have investigated the impacts of non-consumptive effects from predators on the behaviour, development and metabolism of invertebrate pests. However, the non-consumptive effects from parasitoids on their insect hosts remain less well understood. Here, we investigated the non-consumptive effects of the parasitoid Encarsia formosa on the fecundity, longevity and metabolism of the whitefly Bemisia tabaci. Results showed that both the fecundity and longevity of whitefly females were significantly reduced when the whiteflies were threatened by Encarsia parasitoids during their nymphal stages. In addition, we tested three costly and potential physiological correlates that may contribute to the fecundity and longevity variation of B. tabaci under the non-consumptive effects: the relative expression level of vitellogenin and its receptor genes (Vg and Vgr), relative expression level of stress proteins (Hsp70 and Hsp90) and the activities of the antioxidant enzymes superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD). When B. tabaci 4th instar nymphs were threatened for 24 h by E. formosa the relative expression levels of Vg and Vgr were reduced, whereas Hsp70 and Hsp90 were significantly increased. SOD and CAT activities were distinctly up-regulated while POD activity was down-regulated. We propose that, in order to counteract the negative effects of non-consumption, whitefly nymphs need to adjust their performance by changing the expression of related metabolic genes in an energetic cost way, thus reducing the fecundity and longevity of female adults.



中文翻译:

Encarsia formosa对粉虱Bemisia tabaci繁殖和代谢的非消耗作用

捕食性或寄生性天敌对其害虫猎物或宿主的影响不仅来自消费,还来自非消费效应。多项研究调查了捕食者的非消耗性影响对无脊椎动物害虫的行为、发育和代谢的影响。然而,寄生虫对其昆虫宿主的非消耗性影响仍然不太清楚。在这里,我们研究了寄生蜂Encarsia formosa对粉虱Bemisia tabaci的繁殖力、寿命和代谢的非消耗性影响。结果表明,当粉虱受到Encarsia的威胁时,雌性粉虱的繁殖力和寿命均显着降低。在它们的若虫阶段的寄生蜂。此外,我们测试了三种可能导致烟粉虱在非消耗作用下的繁殖力和寿命变异的昂贵且潜在的生理相关因素:卵黄蛋白原及其受体基因(VgVgr)的相对表达水平、相对表达水平应激蛋白(Hsp70Hsp90)的活性以及抗氧化酶超氧化物歧化酶 (SOD)、过氧化氢酶 (CAT) 和过氧化物酶 (POD) 的活性。当烟粉虱第四龄若虫通过24小时威胁E.台塑的相对表达水平Vg的VGR减少,而Hsp70Hsp90显着增加。SOD和CAT活性明显上调而POD活性下调。我们提出,为了抵消不消费的负面影响,粉虱若虫需要通过以能量消耗的方式改变相关代谢基因的表达来调整其性能,从而降低雌性成虫的繁殖力和寿命。

更新日期:2021-06-10
down
wechat
bug