pea cDNA/B.napus Southern problem

Sasha Kraev bckraev at
Thu Nov 10 04:50:12 EST 1994

Try to make a copy reconstruction experiment, that is apply 50 picograms, 25
picograms etc of the probe plasmid on your gel, run it, blot and hybridize. 
If you see 25 ng plasmid band after overnight exposure under your conditions, 
the method works. Your problem may be that the amount of your target in 
genomic lanes does not match the sensitivity of your Southern. This is a 
typical problem with large plant genomes. We had great success only with 
probes >10E9/ug, using nylon filters and UV crosslinking. 
Hope this helps, Sasha

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