Honeydew-Associated Bacteria Suppress Zucchini Defense Responses and Enhance the Performance of the Cotton-Melon Aphid.

Honeydew-associated bacteria from Aphis gossypii suppress zucchini defenses and boost aphid growth, increasing aphid body weight by significantly reducing plant immune responses.

• Why it matters: Understanding how microbial communities in aphid honeydew influence plant defenses is crucial for developing better pest management strategies and revealing complex plant-insect-microbe interactions.
• What they did: The study examined the effects of honeydew bacteria on zucchini defense responses and aphid performance, comparing sterilized and crude honeydew, and testing specific bacterial isolates like Mammaliicoccus sp. and Pseudomonas sp.
• The result: Crude honeydew and certain bacteria decreased defense-related gene expression, JA and SA levels, and PPO activity, leading to improved aphid growth, highlighting honeydew microbiota as key modulators in plant-aphid dynamics.