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Phytochrome

phytochrome

plant pigment protein that absorbs red light and then initiates physiological responses governing light sensitive processes such as germination, growth and flowering. Exists in two forms, pr and pfr, that are interconverted by light. A plant pigment that exists between two forms, [[phytochrome 660 and [[phytochrome 725. They switch between one or the other depending on what time of the day it is, daytime or night time.


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Problem understanding result of lighting regime-phytochrome

... 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 ...

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by ADAS137
Sun Jan 15, 2012 9:42 am
 
Forum: Botany Discussion
Topic: Problem understanding result of lighting regime-phytochrome
Replies: 13
Views: 5000

Problem understanding result of lighting regime-phytochrome

... during the day, than the conversion of Pfr---->Pr during the night? Could you please explain regime 3 and regime 4, step by step in terms of phytochrome and hence flowering?!

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by ADAS137
Thu Dec 15, 2011 2:49 pm
 
Forum: Botany Discussion
Topic: Problem understanding result of lighting regime-phytochrome
Replies: 13
Views: 5000

Re: Problem understanding result of lighting regime-phytochrome

start from slide 15 in this presentation It seems, that the florigen is produced during night in sufficent amount, so that it is not degraded during day.

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by JackBean
Thu Dec 15, 2011 2:40 pm
 
Forum: Botany Discussion
Topic: Problem understanding result of lighting regime-phytochrome
Replies: 13
Views: 5000

Re: Problem understanding result of lighting regime-phytochrome

Sorry the link didn't work , here is a picture:http://clip2net.com/s/1oXHb

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by ADAS137
Wed Dec 14, 2011 10:25 pm
 
Forum: Botany Discussion
Topic: Problem understanding result of lighting regime-phytochrome
Replies: 13
Views: 5000

Problem understanding result of lighting regime-phytochrome

I am really confused with a past paper question, on the website http://www.rewardinglearning.org.uk/...&f=0&q=175&d=d , may/june 2011, A21 (physiology and ecosystems( , question 5. What I don't understand is how lighting regime 3 (given that it is a short day plant) leads to flowering? I...

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by ADAS137
Wed Dec 14, 2011 10:23 pm
 
Forum: Botany Discussion
Topic: Problem understanding result of lighting regime-phytochrome
Replies: 13
Views: 5000
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