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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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Trees

... some sort of internal rhytm of the tree. It could be sensing the amount of day light - case in which some light-sensing proteins need be involved. Phytochrome or Zeit Lupe are my two best guesses in this last case. Without actually studying the tree, we can only take educated guesses. But I'm pretty ...

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by MrMistery
Fri Apr 11, 2008 3:38 pm
 
Forum: Botany Discussion
Topic: Trees
Replies: 5
Views: 1311

Re: Biology Hangman Game

phytochrome?

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by face
Sat Mar 29, 2008 5:47 pm
 
Forum: General Discussion
Topic: Biology Hangman Game
Replies: 572
Views: 45367

Biology Hangman Game

I'm sorry, alwaysasking. There's no 'D', which makes ping's answer correct! It is PHYTOCHROME MECHANISM! Now, as for the prize for the winner... ... ... You've got the honour to... ... ... SET THE NEXT QUESTION! Hehehe...

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by calvin.ng.wh
Sun Jun 03, 2007 5:30 pm
 
Forum: General Discussion
Topic: Biology Hangman Game
Replies: 572
Views: 45367

Biology Hangman Game

OK.I'm only sure for the first word-phytochrome mechanism?

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by ping
Sun Jun 03, 2007 3:30 pm
 
Forum: General Discussion
Topic: Biology Hangman Game
Replies: 572
Views: 45367

Action Spectrum - Red vs blue?

phytochrome and photoperiodism are important, but i think you missed the point of the discussion... By the way, red light is more effieciently used by plants because blue light has much more energy, which cannot be used. It's ...

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by MrMistery
Fri Feb 23, 2007 7:43 pm
 
Forum: Botany Discussion
Topic: Action Spectrum - Red vs blue?
Replies: 15
Views: 5497
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