A KNOTTED1-LIKE HOMEOBOX PROTEIN1-interacting transcription factor SlGATA6 maintains the auxin-response gradient to inhibit abscission.

ABSTRACT: The KNOTTED1-LIKE HOMEOBOX PROTEIN1 (SlKD1) is a master abscission regulator in tomato (Solanum lycopersicum). Here, we identified an SlKD1-interacting transcription factor GATA transcription factor 6 (SlGATA6), which is required for maintaining the auxin-response gradient and preventing abscission. SlGATA6 up-regulates the expression of SlLAX2 and SlIAA3. The AUXIN RESISTANT/LIKE AUXIN RESISTANT (AUX/LAX) proteins SlLAX2-dependent asymmetric auxin distribution causes differential accumulation of Auxin/Indole-3-Acetic Acid 3 (SlIAA3) and its homolog SlIAA32 across different abscission zone cells. It is also required for SUMOylation of AUXIN RESPONSE FACTOR 2a (SlARF2a), a key suppressor of auxin signaling and abscission initiator. Moreover, SlIAA3 and SlIAA32 depress S

SUBMITTER: Liu X 

PROVIDER: S-EPMC11922032 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature