Collinson Nicholas Paul, Giri Khageswor, Kaur Jatinder, Spangenberg German, Malipatil Mallik, Mann Ross Cameron, Valenzuela Isabel
Agriculture Victoria Research, AgriBio Centre for AgriBioscience, 5 Ring Road, Bundoora, VIC 3083, Australia.
Department of Science, Health and Engineering, School of Applied Systems Biology, La Trobe University, Bundoora, VIC 3083, Australia.
Insects. 2024 Sep 26;15(10):744. doi: 10.3390/insects15100744.
The bird cherry-oat aphid, (L.), is an economically significant pest of pasture grasses, the latter being capable of hosting several fungal endophyte-perennial ryegrass symbiota rich in alkaloids and toxic to vertebrates and invertebrates. Measuring aphid feeding behaviour can provide insights into the effectiveness and mode of action of different fungal endophytes. This study investigated the effects of different -perennial ryegrass symbiota on the feeding behaviour of using the electrical penetration graph technique while also assessing the aphid life history. In most cases, endophytes had significant feeding deterrence and paired fecundity and mortality effects. But, in some instances, endophytes with the highest aphid mortality did not significantly deter feeding, suggesting a more complicated scenario of interactions between the relative concentration of metabolites, e.g., host plant defence response metabolites and alkaloids, and/or physical changes to leaf morphology. Overall, this study sheds light on the mode of action of endophytes against aphids and highlights the importance of -perennial ryegrass symbiota in the management of insect pests such as aphids in pasture-based grazing systems.
稠李燕麦蚜（Rhopalosiphum padi (L.)）是一种对牧草具有经济重要性的害虫，牧草能够容纳几种富含生物碱且对脊椎动物和无脊椎动物有毒的真菌内生菌 - 多年生黑麦草共生体。测量蚜虫的取食行为可以深入了解不同真菌内生菌的有效性和作用方式。本研究使用电穿透图技术研究了不同的真菌内生菌 - 多年生黑麦草共生体对稠李燕麦蚜取食行为的影响，同时还评估了蚜虫的生活史。在大多数情况下，内生菌具有显著的取食威慑作用以及对繁殖力和死亡率的影响。但是，在某些情况下，导致蚜虫死亡率最高的内生菌并没有显著威慑取食，这表明代谢物（例如宿主植物防御反应代谢物和生物碱）的相对浓度之间以及/或者叶片形态的物理变化之间的相互作用情况更为复杂。总体而言，本研究揭示了真菌内生菌对蚜虫的作用方式，并突出了真菌内生菌 - 多年生黑麦草共生体在基于牧场的放牧系统中对蚜虫等害虫管理的重要性。
