This PDF file includes:

• Fig. S1. Whitefly vector competes with nonvector CBM on cotton.
• Fig. S2. TYLCCNV βC1 protein interacts with WRKY20 proteins.
• Fig. S3. WRKY20 mediates plant immunity against whitefly.
• Fig. S4. WRKY20 and MYC2 form a negative feedback loop.
• Fig. S5. Plant WRKY20 is a dual-function transcription factor controlling GS biosynthesis.
• Fig. S6. WRKY20 directly targets GS biosynthetic-related genes by binding to their promoters.
• Fig. S7. WRKY20 regulates a JA-mediated GS accumulation in a vascular-specific pattern.
• Fig. S8. βC1 suppresses the WRKY20 activity by interfering with its homodimerization.
• Fig. S9. WRKY20 negatively regulates SA-mediated defense against the green peach aphid.
• Table S1. DNA primers used in this study.

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