Plants That 'Close' At Night
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Old 05-02-2008, 09:34 AM   #1
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Plants That 'Close' At Night


Hello!
Some of you may notice I get up pretty early in the morning..usually around 2-4 a.m. Consequently I like to peek in and see what my tanks are doing at night.
I have several stem plants that close/ fold up at night. How do they do it? It isn't like they have muscles...
And, why do they do it? How come other plants do not?
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Old 05-02-2008, 10:34 AM   #2
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Thank you so much. I am starting to research the word. Very interesting..even suggestions by Charles Darwin.
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Old 05-02-2008, 10:34 AM   #3
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Turgor: the normal distention or rigidity of plant cells, resulting from the pressure exerted by the cell contents on the cell walls.

At sundown, the leaves of these plants fold up or droop down. The corresponding unfolding of leaves comes about at dawn. At the base of every leaf and every leaflet lie swollen, hinge-like structures called pulvini. The pulvini are specialized regions containing large, water-filled cells. The water in these cells can be pumped in or out of the pulvini, resulting in changes in turgor. As turgor is decreased through transpiration, a pulvinus acts as a hinge, allowing the leaf to droop; as turgor is increased, the leaf returns to its daytime position.
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Old 05-02-2008, 10:34 AM   #4
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Damn, beaten to the punch.

And I actually spent time going through my Botany textbook ;_;
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Old 05-02-2008, 10:36 AM   #5
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Heheh..Thanks to you too Gar. So which is it, or are these two one and the same? Turgor/Nyctinasty?
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Old 05-02-2008, 10:39 AM   #6
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Nyctinasty is the name for what happens when a plant closes at night. Turgor pressure is different. ^__^
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Old 05-02-2008, 10:40 AM   #7
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Some good stuff here..fascinating!

http://www.bio.net/bionet/mm/plantbi...ne/000354.html

http://www.biologie.uni-hamburg.de/b-online/e32/32.htm
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Old 05-02-2008, 10:44 AM   #8
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I took a botany course last semester. It was great and all, but there wasn't anything on aquatic plants, which made me quite sad. I'm actually looking to transfer out to a school that has a major in Limnology. Marine is nice and all, but freshwater is just :3
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Old 05-02-2008, 12:47 PM   #9
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Quote:
Originally Posted by ashappar View Post
I think it would look really cool as a time lapse video.
I was thinking the same!
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Old 05-02-2008, 10:17 PM   #10
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So how come other plants, even ones with a similar appearance don't do this? Are they better at conserving the heat without folding up? Are they quicker at absorbing the nutrients they need?
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