Serine Involvement in the Flowering ofLemnaduring Photoperiodic Induction

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Abstract
The levels of the endogenous free amino acid serine in Lemna perpusilla are found to fluctuate during the course of short days. Serine levels do not change in plants receiving long days or continuous light. The levels of serine decrease gradually in the dark reaction of short days reaching their lowest about the middle of the dark period, indicating a utilization of serine during the dark reaction. In the second half of the dark period the serine level rises. The decline and rise of serine during the dark period is observed in successive short-day cycles. During the light period the serine level increases, reaching a maximum after 6 h from the beginning of the light exposure. When the light period is eliminated and a continuous dark period is given the serine level remains unchanged. It is suggested that serine is involved in the floral initiation as a precursor to a flowering substance.

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