Does Urea Force Stomata to Open?

struwwelpeter(5)August 10, 2009

I was told by someone that spraying plants (it may have only been with reference to heliconia) with a solution of urea forces stomata to open. However, I cannot find literary confirmation of this allegation on the web.

Thank you for reporting this comment. Undo
lycopus(z5 NY)

Was not difficult to find a paper that supports this. Here is an abstract

Here is a link that might be useful: Stomatal behaviour towards four classes of herbicides as a basis of selectivity to certain weeds and crop plants

    Bookmark   August 12, 2009 at 12:34PM
Thank you for reporting this comment. Undo
struwwelpeter(5)

No, the paper refers to "urea ... type herbicides" (diuron) which must refer to the molecular structure because diuron contains no urea. Urea is not an herbicide.

    Bookmark   August 12, 2009 at 7:10PM
Thank you for reporting this comment. Undo
lycopus(z5 NY)

Do you have a microscope handy? Would only take an hour or so to test this hypothesis.

    Bookmark   August 12, 2009 at 9:14PM
Thank you for reporting this comment. Undo
struwwelpeter(5)

"Do you have a microscope handy? Would only take an hour or so to test this hypothesis."

No, do you? You have correctly assumed that I have reagent grade urea.

    Bookmark   August 13, 2009 at 12:16PM
Thank you for reporting this comment. Undo
lycopus(z5 NY)

I have access to microscopes but not the urea. A common experiment we perform in our botany labs is to take a leaf peel and observe stomatal opening/closure under treatments of auxin, 20% sucrose or distilled water. Tradescantia (Spiderwort), Commelina (Dayflowers), Zebrina (Wandering Jew) are all good plants to use for observing stomata. I am only familiar with the effect that solute concentration or hormones have on guard cell turgidity. I suspect that growth/vigor is the primary response of interest when urea is applied to a plant, so finding a primary source for this claim may require looking back quite far in the literature...or conduct the experiment yourself.

That is all that I can offer. Perhaps someone will eventually come along with an answer to your question.

    Bookmark   August 13, 2009 at 4:19PM
Sign Up to comment
More Discussions
Name this flower
Found this flower growing up on my fence behind some...
Inswoman
What do you think about mycorrhizae fungi?
As a commercial product, I mean. Can it really help...
leaveswave
grafting compatibility
Hi, is there any logic about matching rootstock and...
lord_of_the_green
Cannabis self pollination effects on hermaphrodite tendencies.
Colorado we have legal rights to grow and breed Marijuana/hemp....
farmerlino
Plant Sciences major, and job availability in the south east
I'm aiming to major in botany horticulture or plant...
gardenapprentice
© 2015 Houzz Inc. Houzz® The new way to design your home™