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- Author or Editor: Henry Robitaille x
Successful fruit thinning of apples (Malus domestica Borkh.) with CGA 15281, an ethylene-releasing compound, was demonstrated at 20 and 46 days past bloom. A rapid drop in fruit removal force was followed by fruit abscission on days 4 and 5. In contrast, ethephon often resulted in protracted abscission and complete fruit removal. Differential sensitivity to CGA 15281 existed among cultivars. Explants were less sensitive to ethylene than intact fruit, and could not be used for controlled experiments. No adverse effects of CGA 15281 were noted with the exception of some leaf drop in the interior of the tree.
Adventive embryos of ‘Golden Delicious’ apple (Malus domestica Borkh.), with differentiated cotyledons and axes, were initiated from micropylar halves of nucellus cultured in darkness on Murashige and Skoog’s salts, vitamins, glycine, and sucrose. Embryos were observed 50 days after culture. Reculture of embryos onto the same medium resulted in proliferation of embryo-like structures from their cotyledons.