Abstract
Sex expression in a monoecious cucurbit, Luffa acutangula Roxb . can be regulated by application of indole-3-acetic acid (IAA), and 3-hydroxymethyl oxindole (HMO), an oxidation product of IAA, both of which promote female flowering. Ethrel is mildly effective in female induction, and it suppresses male bud formation and development. Exogenous benzyladenine (BA) and high endogenous cytokinin inhibit maleness whereas higher level of endogenous gibberellins (GAs) favour maleness. Increased ethylene evolution with IAA or HMO may not be the cause of female induction by IAA or HMO in this plant. Increased IAA oxidase and/or peroxidase is probably associated with femaleness. Pollen germination was inhibited by both the auxins and BA. Early induction of pistillate growth with the auxins was at the cost of vegetative growth.
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