Bacterial symbiont and plant virus protect insect hosts by inducing cuticle thickening against fungal parasites
By
Jun-Bo Luan
Summary
This research article investigates a tripartite defensive symbiosis involving a bacterial symbiont (Hamiltonella defensa), a plant virus (Tomato yellow leaf curl virus, TYLCV), and their insect host (whitefly, Bemisia tabaci). The study reveals that both the bacterial symbiont and the virus enhance insect fitness by inducing physical defenses against fungal parasites. Specifically, they trigger the upregulation of whitefly cuticle proteins, leading to cuticle thickening that physically blocks fungal penetration. This work uncovers a novel mechanism of defensive symbiosis where microbes protect their insect host by reinforcing physical barriers, with implications for understanding symbiont-mediated protection and pest management.
Source
bskyBacterial symbiont and plant virus protect insect hosts by inducing cuticle thickening against fungal parasitespnas.orgKey quotes
· 3 pulledDefensive symbioses in which beneficial microbes protect hosts from natural enemies are ubiquitous across animals and plants, but the underlying mechanisms remain poorly understood.
We show that both the bacterial symbiont and the plant virus enhance insect fitness by inducing physical defenses against fungal parasites.
Our findings reveal a novel mechanism of defensive symbiosis where microbes protect their insect host by reinforcing physical barriers.
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