Localization of phloem unloading in the melon root tips. The emergence of the СF in the root tips in 0 (A), 1.5 (B), 4 (C) and 10 (D) hours after its application to the cotyledons. The dashed line indicates the boundary between the meristem and the elongation zone. The boundary between the root zones was determined by morphometric analysis. Bar – 500 µm.