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The Effects of Ethephon on Cattleya aurantiaca (Orchidaceae) Seedlings
Abstract
In C. aurantiaca seedlings, ethephon (2-chloroethylphosphonic acid, also known as Ethrel), slightly accelerated leaf development at concentrations between 2.5 and 20 ppm but suppressed it at 50 ppm. It inhibited leaf length at concentrations of 2.5, 5 and 50 ppm but enhanced it at 10 and 20 ppm. Root formation was inhibited by concentrations higher than 2.5 ppm. Chlorophyll content of seedlings was highest on a medium containing 5 ppm ethephon.
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