Trichoderma swollenin activates AtABCB5-dependent auxin efflux to promote plant development.

The beneficial fungus Trichoderma enhances plant growth and stress tolerance through poorly understood mechanisms.

The beneficial fungus Trichoderma enhances plant growth and stress tolerance through poorly understood mechanisms. Here, we show that Trichoderma harzianum swollenin ThSWO contributes to efficient root colonization and plant growth promotion. ThSWO traverses the plant cell wall…