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Influence of Temperature on the Flowering of Lemna perpusilla 6746 Grown under Skeleton Photoperiods ^1,2

^a Department of Environmental Horticulture, University of California, Davis, California 95616

The flowering of Lemna perpusilla Torr. strain 6746 grown under 24-hour skeleton photoperiods consisting of 13- and 10.5-hour dark periods separated by 0.25-hr light pulses is strongly dependent on temperature. When plants are cultured in 50-ml Erlenmeyer flasks containing 20 ml of half-strength Hutner's medium supplemented with 1% (w/v) sucrose maximum, per cent, flowering occurs at 23 C. At temperatures above and below 23 C a marked decline in per cent flowering is seen.

¹ This research was supported in part by a Chancellor's Patent Fund Grant and a Priority C Research Grant, University of California, Davis.

² A portion of this report is taken from a dissertation submitted in partial fulfillment of the requirements for a Ph.D. degree in Plant Physiology at the University of California, Davis.