Abstract
Inflorescences of Cycnoches warscewiczii Rchb. f. and Catasetum expansum Rchb. f., which developed on plants grown in full sunlight, evolved 0.12-2.08 nl ethylene per raceme per hour. This was two to 100 times greater than racemes of plants grown in the shade where light intensities were one-half to two-thirds lower. An exception was high levels of ethylene consistently emitted by developing female flowers even when plants were grown in the shade. Conversely, low levels were evolved by sun-grown inflorescences that bore male flowers. Within 1 h of abrupt changes in light intensity, ethylene production increased when plants were moved from shade to full sunlight and decreased when they were returned to the shade. Lightexclusion studies indicated that the racemes perceived the changes in light intensity. Inflorescences of Cycnoches dianae Rchb. f., Cycnoches densiflorum Rolfe, Cycnoches aureum Lindl., Cycnoches stenodactylon Schltr., Catasetum tabulate Lindl., and Catasetum maculatum L. C. Rich ex Kunth wer...
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