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Transpiration and Light intensity

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Transpiration and Light intensity

Postby Squid » Thu May 04, 2006 7:14 pm

I was wondering if anybody could help me on my bio planning exercise where i am comparing transpiration and light intensity. I need some theories on what will happen etc and some sound scientific knowledge. Thankyou
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Postby kiekyon » Fri May 05, 2006 1:35 am

Light is one of the major factors influencing the rate of transpiration because of its controlling effect on the opening and closing of stomates. Light of low intensity is, generally speaking, less effective than stronger light in inducing stomatal opening. Hence stomates often do not open as wide on cloudy as on clear days, and often do not remain open for as much of the daylight period
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Postby MrMistery » Fri May 05, 2006 6:49 pm

For the mechanism to get started, a proton pump in the membrane needs to get activated by blue light. Later in the stomata opening mechanism red light is necessary in order to turn starch into malate and keep the stomata open.
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Postby bigbounce » Tue May 09, 2006 10:00 am

what r the best plants to use for light intensity
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Postby SilverXIII » Thu May 11, 2006 12:11 pm

I think...

Light of low intensity is, generally speaking, less effective than stronger light in inducing stomatal opening. Hence stomates often do not open as wide on cloudy as on clear days, and often do not remain open for as much of the daylight period


O.o really? I thought it was the other way around.

The Stomates tend to open more on cloudy / rainy / humid / anything that has got to do with water or moisture days, because it has a good quantity of water for it to be replaced inside the plant.

Whilst on Sunny, dry, windy, hot days, the stomates open less, because it does not want to lose all the water inside it. These hot conditions will cause the plant to lose alot of water, so the stomates tend to open less to trap the water inside it. I think :P


and..



For the mechanism to get started, a proton pump in the membrane needs to get activated by blue light. Later in the stomata opening mechanism red light is necessary in order to turn starch into malate and keep the stomata open.


Sorry for my unknowledgable'ness (is that a word? :P), but can i make sure, because i dont understand very well of this light process :P

For the mechanism to get started --> The stomates?
are Blue and Red light are most effectively used by plants?
And i thought all you need was the guardcells to be turgid so the stomata opens :P Guess i am still in the newbie level of biology :P By the way, how does malate (or what is it) allow the stomata to open? does it have somethign to do with teh guard cells?


And do i use alot of :P emoticons in my reply ? :P
... If you think about it.
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Postby kiekyon » Fri May 12, 2006 8:52 am

SilverXIII wrote:I think...

Light of low intensity is, generally speaking, less effective than stronger light in inducing stomatal opening. Hence stomates often do not open as wide on cloudy as on clear days, and often do not remain open for as much of the daylight period


O.o really? I thought it was the other way around.

The Stomates tend to open more on cloudy / rainy / humid / anything that has got to do with water or moisture days, because it has a good quantity of water for it to be replaced inside the plant.

Whilst on Sunny, dry, windy, hot days, the stomates open less, because it does not want to lose all the water inside it. These hot conditions will cause the plant to lose alot of water, so the stomates tend to open less to trap the water inside it. I think :P



arent them the same thing? :?:
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Postby SilverXIII » Sat May 13, 2006 4:42 am

oh wait.. i think i read it and .. nvm something wrong with me lol :P I read this and i think somethign else. :P Or maybe the wording just confused me <,<
... If you think about it.
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