Return to the Botany Forum | Post a Follow-Up

Does Urea Force Stomata to Open?

Posted by struwwelpeter 5 (My Page) on
Mon, Aug 10, 09 at 11:49

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.

Follow-Up Postings:

RE: Does Urea Force Stomata to Open?

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

RE: Does Urea Force Stomata to Open?

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.

RE: Does Urea Force Stomata to Open?

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

RE: Does Urea Force Stomata to Open?

"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.

RE: Does Urea Force Stomata to Open?

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.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Botany Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here