Spatio-temporal expression of CsSUT1 in cucumber. A, RT-qPCR analysis of CsSUT1 in different plant organs. B, RT-qPCR analysis of CsSUT1 at various stages of male flower development. Images in (B) were obtained from the male flower at various developmental stages, illustrated by different floral bud lengths. C, Expression analysis of three cucumber SUTs in sepals, petals, anthers, and pollen of stage 12 male flowers. Error bars represent ± sem (n = 3). Abbreviations: R, root; S, stem; YL, young leaf; ML, mature leaf; MF, male flower; FF, female flower; F, fruit.