Fig. 1 Schematic diagram of the growth and development of tomato A：Sketch map of axial growth of tomato plant，inflorescence，and floral organs. B：Development and ripening of tomato fruit. C：Longitudinal section of tomato fruit. Fruit length and pericarp thickness is determined by growth along proximal-distal and abaxial-adaxial axis，respectively. D：Transversal section of tomato fruit. Fruit width is determined by growth along medio-lateral axis.

Fig. 2 The molecular basis of QTL gene affecting tomato fruit shape（van der Knaap et al.，2014；Xu et al.，2015） Red box indicates the coding region of the functional gene；| indicates SNP；↑ indicates base insertion；∧ denotes the point mutation and corresponding amino acid changes of genes. The tomato diagrams on the right show the mutation phenotypes of corresponding QTL genes. According to Xu et al.（2015），five fin mutants were obtained by mutagenesis，of which two of them have missense mutations in HAPT3，and the others have base deletion leading to transcript absence. m stands for mutant.

Fig. 3 The WUS-CLV pathway regulates the carpel number and then affects fruit size A：Genes in meristem that affect the number of fruit ventricles and size by regulating WUS-CLV pathway. B：Cross section of tomato fruit. WT fruit generally has two locules，while fruits of fas，fab，lc，fin，eno，ima，knu and OE-BES1.8 have more locules and larger size.