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Heterogenous size

Maria Cristina Costanzo mcc9 at cornell.edu
Thu Nov 2 12:30:43 EST 1995

In article <v01520d00acbc9906959a@[]>,
germain at PETERMAC.UNIMELB.EDU.AU (Doris Germain) wrote:

> Hello everybody,
>         Let's say you stick out a strain for single colony on a plate. What
> would be your explanation (beside contamination of two strains) for
> heterogenous colony size on a plate?
> Thank you
> Doris Germain
> Trescowthick Research Laboratories
> Peter MacCallum Cancer Institute
> Locked Bag 1
> A'Beckett Street
> Melbourne VIC 3000

Dear Doris,

Many strains throw off spontaneous petites at high frequency - that is,
large deletions of the mitochondrial DNA occur. These so-called rho-
strains make smaller colonies than wild-type rho+ cells.  If this is the
case for your strain, then the larger colonies will be able to grow on
ethanol-glycerol medium, the smaller ones not.  Hope this helps -

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