Winter GH

[Peter A Peterson]

Not sure about tip rot in your greenhouse, but when the people in 
Cologne Germany were in the Green house they got the same conditions. 
My suggestion to them was that the lights were too "rich" and sugars 
were building up in the tips and thus the rotting and shriveling of 
anthers. They cut down on the lights and this was corrected. Not sure 
about your case but check the intensity of the lights. PAP

At 10:30 AM 12/7/99 -0800, you wrote:
>Dear Fellow Maize Folks,
>
>	We are trying to fix up a very small old greenhouse room so that we
>can grow plants and harvest good male meiocytes through the winter (Nov-Feb
>are hard for us).  We have played with a lot of conditions, but we are
>still getting tip rot and many of the plants have sterile shrivelled
>anthers. Some that make good looking anthers actually have meiocytes
>arrested at pachytene with a thickened wall.  The current conditions are:
>Specs:  250 square feet.
>	4 metal halid lamps with new bulbs
>	lights on from 6 am to 10 pm
>	plants potted in sterile soil (not peet)
>	82-85 degrees day and night
>	there is a fan on day (high speed) and night (Low speed)
>
>	Anyone have any ideas how we can improve our situation?  If you
>have perfectly shedding plants in your green house right now, in Dec, can
>you let me know how you do it?  I would be happy to contact your greenhouse
>manager if that is easiest.  Thank you very much!
>
>Lisa Harper
>Cande Lab
>Department of Molecular and Cell Biology
>345 LSA
>University of California
>Berkeley, CA 94720-3200
>(510)-643-8277

---------
Peter A. Peterson
Agronomy Department
Iowa State University
Ames, Iowa 50011
OFFICE: [515] 294-9652
FAX: [515] 294-2299
pap at iastate.edu
http://www.public.iastate.edu/~pap/homepage.html