B-vitamins in tissue culture media

[ynes at mindspring.com]

Claudia Sutton wrote:
> 
> Just wondering--
> why are B-vitamins in plant tissue culture media.  If it's because plant
> cells need them to grow, where do plants get these compounds in the wild?
> 
> Claudia

I heard that some amount of  B vitamin can be found in rain water.
Don’t know if this is true, but this could be one possible natural
source.

Fred