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Abstract
Staminate flowers were induced in a gynoecious line (MSU 394G) and the pistillate phase was delayed in a monoecious cultivar (‘Sumter’) of cucumber (Cucumis sativus L.) with 2 phthalimide derivatives, 1-(3-chlorophthalimido)-cyclohexanecarboxamide and 1-(1-cyclohexene-1,2-dicarboximido)-cyclohexanecarboxamide. Single and multiple foliar sprays at 1000 mg liter−1 during expansion of the first true leaf (5–7 cm in width) delayed flowering as indexed by days from seeding to anthesis and the node of the first pistillate flower in monoecious ‘Sumter’. Repeat applications induced staminate flowers in gynoecious MSU 394G and staminate flower production continued over a wide range of nodes. Marked differences in response to the phthalimides appeared to be related to the season in which the experiments were performed. The greatest number of staminate flowers was induced when the gynoecious plants were exposed to an 8-hour photoperiod early in plant development and then grown under a 14-hour photoperiod.
Abstract
The phthalimide 1-(1-cyclohexene-1,2-dicarboximido)-cyclohexanecarboxamide delayed formation of pistillate flowers in a monoecious cucumber (Cucumis sativus L. cv. Sumter). A saturating dose completely inhibited ethylene-enhanced pistillate flower formation in respect to number of nodes preceding the first pistillate flower and number of pistillate flowers produced per plant.
Abstract
Parthenocarpic fruit development was induced in ‘Montmorency’ sour cherry (Prunus cerasus L.) with AC 94377. The biological activity of AC 94377 was increased significantly by NAA. The development (Stages I, II, III, “June drop”, ripening) of parthenocarpic fruit was similar to that of open pollinated controls except for smaller fruit size. Ovules enlarged during Stage I in AC 94377-induced parthenocarpic fruit, but lacked embryos; all ovules aborted during Stage II or III of fruit development. The primary action of NAA appeared to reduce abscission of AC 94377-treated ovaries with no significant effect on fruit size. Chemical names used: 1-naphthaleneacetic acid (NAA); N-(phenylmethyl)-1H-purin-6-amine (6-BA); 1-(3-chlorophthalimido)-cy-clohexanecarboximide (AC 94377); polyoxyethylene sorbitan monooleate (Atlox BI).