Extreme Hydrolyzable Tannin Accumulation in Aphid-Induced Galls and Laccase-Mediated Tolerance in Schlechtendalia chinensis.

Aphid-induced galls in Rhus chinensis accumulate up to 74.5% hydrolyzable tannins, with laccase enzyme activity enabling Schlechtendalia chinensis to tolerate this high tannin level.

• Why it matters: Understanding how plants produce extreme tannin levels and how herbivores survive such toxicity addresses key gaps in plant-insect interactions and secondary metabolism adaptation.
• What they did: Researchers tracked tannin accumulation and gene expression during gall development, expressed candidate genes in Arabidopsis, and characterized aphid enzymes, focusing on laccase activity and gene silencing experiments.
• The result: Laccase, especially Sc-Lac5, is crucial for aphids to detoxify tannins, with silencing causing toxicity and accumulation in their bodies, revealing a key tolerance mechanism.