Abstract
Abstract Water loss in relation to the wax associated with the surface of leaves of Brassica oleracea was investigated. Varieties of Brussels sprouts, broccoli, cauliflower and collards were found to possess highly significant differences in regard to stomatal transpiration, cuticular transpiration and quantity of wax per unit area of leaf surface. Rubbing away the waxy bloom increased the cuticular transpiration rate. There was little correlation between the quantity of wax and the water loss per unit area of leaf surface either during the daytime or nighttime experiments. It appears inadvisable to attempt to breed for drought resistance in Brassica oleracea by selecting for the presence of a heavy waxy bloom or high levels of wax per unit area of leaf surface.
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