Abstract
Growth and flowering of individual fronds of Lemna gibba G3 was analysed. Fronds that formed flowers under a standard continuous light condition were divided into three groups: large, middle and small fronds. Diameter of the fronds of each group at the 6.5th day of the continuous light was 1100-340 μm 330-250 μm and <200 μm, respectively. Short-day treatments decreased flower formation in both large and small fronds. Red or far-red light interruption of the dark period of the short-day preceding the continuous light period increased or decreased flowering only in the large fronds. This was taken to indicate that the night interruptions altered starting time of flower induction but not subsequent growth of flower buds. The kinetics of flower and frond production was analysed. It was suggested that the first flower bud was induced during the second day.
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