Fig. 1

Variation and correlation in fresh-market tomato yields. a The distribution of BLUPs for phenotypic values of four traits in 68 core inbred contemporary fresh-market tomatoes (inbred tomato set) are indicated by the black lines [Y, the total yield; XY, the yield of extra-large-sized fruit; SY, the yield of any fruit smaller than medium size; RY, the yield of red-colored fruit regardless of size (a through c)]. The numerical correlation coefficients (r value) with statistical significance (^**p < 0.01, ^***p < 0.001) and scatter plots of correlations between two traits are shown in the upper and lower panels, respectively. The red lines in the scatter plots represent the correlation trends; the gray areas indicate standard errors. b Loading plot of principal component (PC)1 and PC2 of Y, XY, SY, and RY traits. c Multi-collinearity analysis. The strength of collinearity is indicated by the darkness and thickness of line. d Principal component analysis (PCA) of SNP variations in the inbred tomato set