DCMU problems

Jonathan B. Marder MARDER at agri.huji.ac.il
Mon Sep 18 01:39:38 EST 1995

In article <199509150403.AA09060 at sequoia.itd.uts.EDU.AU>,
   P.Ralph at uts.edu.au wrote:
>Dear Netters,
>I've been trying for several months to run a series of DCMU treated 
>trials with the seagrass Halophila ovalis.  Unfortunately, everything I 
>causes a permanent and significant decline in the Fv/Fm ratio after 
>treatment before being exposed to the stress.
>I've tried vacuum infiltration, treatment in the dark, treatment in the
>light and ranges of DCMU from 100 M to 1 M. Treatment times range from 
>min down to 30 sec. 

Perhaps you could give a bit more detail.
1. "100 M DCMU" is surely a misprint. Do you mean millimolar?
2. How are you measuring Fv and Fm. Are you doing the proper controls?
3. Quite possibly infiltration with 1% Tween has some effect. Do you 
   have a suitable control?
4. When you mention "exposure", do you mean exposure to just DCMU, 

Jonathan B. Marder                 '
Department of Agricultural Botany  |     Internet: MARDER at agri.huji.ac.il
The Hebrew University of Jerusalem | /\/
Faculty of Agriculture             |/  \ Phone:    (08 or +9728) 481918
P.O.Box 12, Rehovot 76100, ISRAEL  /     Fax:      (08 or +9728) 467763

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