[Arabidopsis] JA and ABA treatments

[yuanqing from ualberta.ca]

Hi, colleagues,

I am going to treat plants with JA and ABA for Northern blotting  
analysis. Should I cover the plants after spraying 50 uM of JA and ABA  
separately? I have those high plastic colorless covers that can cover  
the whole trays. I do not have separate chambers for treated plants  
and mock plants; I have to place them in the same chamber. I will try  
to separate them by some distance. Someone in the lab said I do not  
need to cover them, while I think that they should be covered to avoid  
influence each other as they are in the same chamber. Any reply would  
be appreciated.

Thanks.