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Tomato is a model species for fleshy fruit development. The shapes and sizes of tomato ( Solanum lycopersicum L. ) are mainly controlled by several loci, including locule number ( lc ). Two single nucleotide polymorphisms were found downstream of  WUSCHEL  ( SlWUS ) in a putative tomato CArG  cis -regulatory element. The  lc  mutation may affect the binding of  AGAMOUS ( AG ), cause the up-regulation of  SlWUS  and result in increased locule numbers. In this study, tissue expression levels showed that  SlWUS  is expressed in young floral buds and shoot apexes. Silencing  SlWUS  on an  lc  mutant genetic background with an RNA interference (RNAi) strategy resulted in smaller flowers and fruit than those of the wild-type plants, with decreased locule number. Further study revealed that the  SlWUS  RNAi lines exhibited altered expression levels of the  TAG1  and  SlCLV3  genes that participate in the regulation of tomato flower and fruit locule development. In conclusion, this study provides the first genetic evidence that  SlWUS  may be the candidate gene of the  lc  locus and reveals the function of  SlWUS  in flower development.

Tomato Transcription Factor SlWUS Plays an Important Role in Tomato Flower and Locule Development