Fig. 8

A simple working model of the LlC3H18-mediated regulatory mechanism in lily in response to heat stress. A Under HS conditions, LlC3H18 is a heat-inducible CCCH gene, which can be directly activated by LlMYB305; LlC3H18 locates in the cytoplasm foci and acts as RNA binding protein to form mRNP granules, thus balancing the thermotolerance. B At the recovery period without HS, LlC3H18 can be transformed from cytoplasm foci to localize in the nucleus, which promotes it to act as a trans-activator, directly activating the expression of LlWRKY33, thus forming a heat-inducible LlMYB305-LlC3H18-LlWRKY33 regulatory module, and sustaining the heat stress response. The gray arrow indicates a closed state, while the yellow arrow indicates a working state. HS Heat stress, PB Processing body, SG Stress granule