Fluoroskopische Untersuchungen an Keulenhaaren vonVicia faba L. undPhaseolus coccineus L.

Foliar Penetration of Herbicides: Review and Present Status

“…Cellularly, the movement of spray substance may be in the wall or in the protoplast. Using a fluorescent dye, sodium 3-hydroxy-5,8,10-pyrenetrisulfonate (PTS), which is non-toxic and not absorbed by normal uninjured protoplasm, wall movement is clearly shown in both upper and lower epidermis (19,44). This movement is similar to the extrafasicular transpiration stream studied by Strugger (152) and by Wylie (179), but in the reverse direction.…”

“…Hairs represent increased epidermal (or cuticular) absorbing surface (19). Pubescent leaves retained a greater amount of 2,4-D (with or without carbowax) than glabrous leaves (51).…”

Modification of Succinic Acid-2,2-Dimethylhydrazide Growth Inhibition of Bean Plants by Surfactants1

“…Foliar penetration of succinic acid-2,2-dimethylhydrazide (SADH) has been shown to occur by a diffusion process limited by the permeability of the cuticular membrane (13). The cuticular membrane over anticlinal walls, guard cells, and at the base of glandular trichomes was preferentially permeable to polar molecules (2,7,11,13,15,17), while at the same time these surfaces were difficult to wet because of surface topography (18). Maximum penetration, therefore, is achieved only from solutions which wet the leaf surface.…”