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DNA stain for living plant cells

Kwee Hong Sien hongsien at ima.org.sg
Thu Oct 16 03:34:18 EST 1997

Dear all,

Can someone give me a method on how to stain DNA in LIVING plant cells? 
I would like to check in which cell cycle stage my BY-2 tobacco 
suspension cells are. I have used DAPI and Ethidium bromide (excitated 
in UV and FITC respectively) but they only enter dead cells. I presume 
the dyes can't enter the cells due to the low permeability of the cell 
walls? I also tried DAPI and EtBr in combination with PEG, but no 
success. Haven't tried detergents though. Off course I can also try usig 
BY-2 protoplasts, but if possible I would like to see normal plant 

Thanks in advance!

Hong Sien Kwee
Plant Genetics Laboratory
Institute of Molecular Agrobiology
59A The Fleming
Science Park Drive
Singapore 118240

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