Fig 6. Visualization of water uptake and transport in watermelon (Citrullus vulgaris Schrad.) ‘Sambok Honey’ and ‘Speed’ as the scion and bottle gourd (Lagenaria siceraria Stanld.) ‘RS Dongjanggun’ as rootstock seedlings grown under different photon flux densities (25, 50, 75 and 100 μmol m−2 s−1 PPFD).

The rootstock were submerged in absorbable flower dye blue for 10–20 min and both rootstock and scion were cut into transverse and longitudinal cross section and were observed under light microscope. The arrows in vascular tissues represent the vascular transport activity. (A-B) represents longitudinal section without flower dye blue; (C-D) represents longitudinal section with flower dye blue; (E-F) represents transverse section without flower dye; (G-H) represents transverse section with flower dye blue in rootstock and scion.