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The MADS-box transcription factors play essential roles in many physiological and biochemical processes of plants, especially in fruit ripening. Here, a tomato MADS-box gene,  SlCMB1 , was isolated.  SlCMB1  expression declined with the fruit ripening from immature green to B + 7 (7 days after Breaker) fruits in the wild type (WT) and was lower in  Nr  and  rin  mutants fruits. Tomato plants with reduced  SlCMB1  mRNA displayed delayed fruit ripening, reduced ethylene production and carotenoid accumulation. The ethylene production in  SlCMB1 -RNAi fruits decreased by approximately 50% as compared to WT. The transcripts of ethylene biosynthesis genes ( ACS2 ,  ACS4 ,  ACO1  and  ACO3 ), ethylene-responsive genes ( E4 ,  E8  and  ERF1 ) and fruit ripening-related genes ( RIN ,  TAGL1 ,  FUL1 ,  FUL2 ,  LoxC  and  PE ) were inhibited in  SlCMB1 -RNAi fruits. The carotenoid accumulation was decreased and two carotenoid synthesis-related genes ( PSY1  and  PDS ) were down-regulated while three lycopene cyclase genes ( CYCB ,  LCYB  and  LCYE ) were up-regulated in transgenic fruits. Furthermore, yeast two-hybrid assay showed that SlCMB1 could interact with SlMADS-RIN, SlMADS1, SlAP2a and TAGL1, respectively. Collectively, these results indicate that SlCMB1 is a new component to the current model of regulatory network that regulates ethylene biosynthesis and carotenoid accumulation during fruit ripening.

A tomato MADS-box protein, SlCMB1, regulates ethylene biosynthesis and carotenoid accumulation during fruit ripening