Photoperiodic plants measure the length of the night, not the day. Interrupting a long night with a brief period of the light inhibits flowerring in short-day plants. Long- day plants flower when the night is short, but interrupting their long day has no effectWhen plants are exposed to red and far-red light in a Iternation, the final treatment determines the effect of the light interruption suggesting that phytochorme participates in photoperiodic responses.
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