Sort of get it now- the key was that the flash of 'light' which interrupts the nights, is RED light not DAYLIGHT- therefore the conversion into Pfr is very rapid.In contrast accumulation of Pfr in daylight is much slower as there is far red light too which makes the net accumulation smaller.
I now appreciate that for a short night, it is the short night part rather than the long day plant which is important, vice versa for long night plant. However, can someone explain this to me in terms of Phytochrome (Pr/Pfr)?
Is it b/c dark reversion is so slow, and therefore interrupting a light period with darkness won't convert much Pfr to Pr? Whereas in a night period, the flash of red light accumulates Pfr very fast and therefore has a greater effect?
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