Seed produced through Tissue culture has resulted in to altered shape of tubers (from round to oval)in some potato varieties.
This can be due to ' somaclonal variation '. One of the major problems of in vitro plant cultivation is the high level of somaclonal variation. I attached one research for you: "Somaclonal variation on in vitro callus culture potato cultivars". Please see the link below:
http://www.scielo.br/scielo.php?pid=s0102-05362004000200027&script=sci_arttext
Even if the plantlets remain free of pests and microbes, they may mutateEach time any type of cell replicates, including potato cells, there is a chance that a mutation can occur. if a mutation happens, the original variety can easily be lost.for ex. Like Silverton potato tubers.
I agree with the two answers by Yuan-Yeu and Suresh. If the change persists through a few cycles of field propagation, you have the right to register it as a new cultivar. Oval tubers have an advantage in cooking; they cook more evenly.
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