Stomata - Opening and closing times
Login
User Name
Password   


Registration is FREE. Click to become a member of OrchidBoard community
(You're NOT logged in)

menu menu

Sponsor
Donate Now
and become
Forum Supporter.

Stomata - Opening and closing times
Many perks!
<...more...>


Sponsor
 

Google


Fauna Top Sites
LOG IN/REGISTER TO CLOSE THIS ADVERTISEMENT
  #1  
Old 10-14-2021, 05:06 PM
rbarata rbarata is offline
Senior Member
 

Join Date: Mar 2015
Zone: 10a
Location: Abrantes
Posts: 5,361
Stomata - Opening and closing times Male
Default Stomata - Opening and closing times

My doubt is:

If a CAM plant is in the dark and I change it into light how much will it take for the stomata to close. And the reverse, from light to dark (opening).

Thank you
__________________
Meteo data at my city here.

Last edited by rbarata; 10-14-2021 at 05:16 PM..
Reply With Quote
  #2  
Old 10-14-2021, 07:15 PM
Ray's Avatar
Ray Ray is offline
Senior Member
 

Join Date: May 2005
Member of:AOS
Location: Oak Island NC
Posts: 14,782
Stomata - Opening and closing times Male
Default

I cannot answer your question, but stomatal opening and closing is controlled by light levels, humidity and the availability of water at the root system...
__________________
Ray Barkalow, Orchid Iconoclast
FIRSTRAYS.COM
Try Kelpak - you won't be sorry!
Reply With Quote
Post Thanks / Like - 2 Likes
Likes DirtyCoconuts, Steve83 liked this post
  #3  
Old 10-14-2021, 07:44 PM
rbarata rbarata is offline
Senior Member
 

Join Date: Mar 2015
Zone: 10a
Location: Abrantes
Posts: 5,361
Stomata - Opening and closing times Male
Default

I'm aware that it might be a difficult question...I always assumed without any objective evidence to support it that it might take some time (1 hr, at least).
I water many of my orchids at night (rupics, Catts, etc) but, obviously, I need light to do it. So, there's a darkness interruption for a few minutes.
Hence my question....
__________________
Meteo data at my city here.
Reply With Quote
  #4  
Old 01-31-2022, 12:16 AM
Louis_W's Avatar
Louis_W Louis_W is offline
Senior Member
 

Join Date: Mar 2011
Location: Albuquerque New Mexico
Posts: 794
Stomata - Opening and closing times
Default

I don't have any real facts on this but my guess is that the opening and closing of stomata is triggered by multiple cues at the same time. I believe that they can open in cooler times of day or more humid periods. It's difficult to get to the bottom of this question because many orchids can flex between C3 and CAM, and they don't seem to be very clear on what the deal with that is.

Approaching from the practical rather than the microbiological side of things may be more clear. Many of us grow in urban environments with plenty of light pollution and here doesn't seem to be too much problem. That not to say things couldn't be improved with darker nights. I have heard that C. walkeriana and perhaps C nobilior are pretty sensitive to night time illumination. That could be why but I'm not sure.
Reply With Quote
  #5  
Old 01-31-2022, 01:53 PM
estación seca's Avatar
estación seca estación seca is offline
Senior Member
 

Join Date: Jun 2015
Zone: 9b
Location: Phoenix AZ - Lower Sonoran Desert
Posts: 17,749
Stomata - Opening and closing times Male
Default

I don't know about orchids. Desert cacti, obligate CAM plants opening stomata only at night, can take up water at any time, even with stomata closed. The interior of the plant has a much higher concentration of solutes than the exterior, so transpiration is not needed for water uptake. I would be surprised if CAM orchids were different.
__________________
May the bridges I've burned light my way.

Weather forecast for my neighborhood
Reply With Quote
  #6  
Old 01-31-2022, 02:58 PM
rbarata rbarata is offline
Senior Member
 

Join Date: Mar 2015
Zone: 10a
Location: Abrantes
Posts: 5,361
Stomata - Opening and closing times Male
Default

I've read a study about this subject a few months ago. The object were two different CAM orchid species (can't remember where I have found it neither which species) and the time needed for the stomata to close/open had a huge variation. One of the species needed less than a minute while the other needed a few hrs.
__________________
Meteo data at my city here.
Reply With Quote
  #7  
Old 02-11-2022, 01:03 PM
isurus79's Avatar
isurus79 isurus79 is offline
Senior Member
American Orchid Society Judge
 

Join Date: Sep 2007
Zone: 8b
Location: San Antonio, Texas
Age: 44
Posts: 10,154
Default

Quote:
Originally Posted by Louis_W View Post
I have heard that C. walkeriana and perhaps C nobilior are pretty sensitive to night time illumination.
Nobilior are not sensitive to night light at all

---------- Post added at 12:03 PM ---------- Previous post was at 11:59 AM ----------

Well, plants use their circadian rhythm to anticipate sunrise (see link below), so it would make sense that CAM plants (and others) can anticipate sunset. Anecdotally, walkeriana starts its fragrance just before the sun is up, also indicating some anticipation of sunrise.

Sunflowers Use Internal Circadian Clock to Follow Sun | Sci-News.com
__________________
Stephen Van Kampen-Lewis

Pics on Flickr

Instagram

YouTube
Reply With Quote
Reply

Bookmarks

Tags
close, dark, light, reverse, stomata


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 04:29 AM.

© 2007 OrchidBoard.com
Search Engine Optimisation provided by DragonByte SEO v2.0.37 (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.

Clubs vBulletin Plugins by Drive Thru Online, Inc.