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Problem understanding result of lighting regime-phytochrome

Plants!

Moderator: BioTeam

Postby JackBean » Thu Dec 15, 2011 5:28 pm

From what I read today, I understood, the changes are pretty quick. All the proteins are changed in 3 hours. Thus it probably isn't about the P730 or P660, but the downstream processes.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Postby ADAS137 » Sun Jan 15, 2012 9:42 am

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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