Fluorescence microscopy of pollen tubes in interspecific crosses of Cucumis spp. Pollen tubes were stained with aniline blue. (a) PI 147065בMR-1’, (b) PI 320052בMR-
1’, (c) PI 526242בMR-1’, (d) ‘MR-1’×PI 320052, (e) ‘MR-1’×PI 526242, (f) self-pollinated ‘MR-1’. Bars = 100m.