Action Spectra Confirm Two Separate Actions of Phytochrome in the Induction of Flowering in Lemna paucicostata 441

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Action spectra studies have shown that in the short day plant (SDP) Lemna paucicostata 441 there are at least two actions of phytochrome in the induction of flowering. At the beginning of the dark period far-red light inhibited flowering, and the action spectrum corresponded to the absorption spectrum of P_<FR>, while at the middle of the inductive dark period both red and far-red light were inhibitory. The action spectrum for the red light corresponded to that of P_R absorption, but there was activity in the region beyond 720 nm which exactly coincided with the absorption by P_<FR> observed at the beginning of the dark period, indicating that at the middle of the dark period there was absorption by both P_R and P_<FR>. The difference in quantum efficiency between the red and far-red light effects was about 60-fold. These results are consistent with there being a stable pool of P_<FR> necessary for the induction of flowering and another pool of phytochrome in a different cellular environment which participates in the night-break reaction as P_R.
日本植物生理学会の論文