Flowering response of Lemna perpusilla 6746 to a single dark period

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Lemna perpusilla 6746 is induced to flower by a single long dark period, but the floral buds once formed disappear after several days under 5000 lux/25℃. Such regression of floral buds is prevented by lowering the light intensity or temperature, but if the light intensity and/or temperature are lowered beyond critical levels, new floral buds form. If the cultures are subjected to 100 lux/20℃, neither regression nor new formation of floral buds occurs. Under such conditions,the number of floral fronds reaches maximum about 6 days after the inductive dark period and reamins unchanged for at least 10 days, while the percentage of floral fronds rapidly decreases thereafter, owing to the dilution by newly developed vegetative fronds. When the cultures are subjected to various lengths of a single dark period (25℃) followed by 100 lux/20℃, flowering responses represented by the number of floral fronds per flask show rhythmic fluctuation with a cycle length of about 24 hr. Similar rhythmic response is observed when a brief light interruption is given at different times during a single long dark period.
日本植物生理学会の論文