Yes, first year seedling potato plants from TPS often live longer than if from tubers. It makes it difficult to estimate days to maturity. Naturally if one pull berries from healthy vines of rather late varieties/clones...the resulting TPS seedlings may be represented by increasingly later maturities.
Since TPS seedlings carry little or no virus unless infected late in the growth cycle....the earlier die back will happen when the tubers replanted carry latent year infections causing rather benign injury but can be seen as much earlier as the years go by....and earliness is enhanced when a potato grows from a tuber anyway....the dynamics of which would take be a while to explain.
One may pick up Virus A or Virus S and the plants may appear symptomless but just enough stress is placed on the vine to cause it to die down quicker.
Tom Wagner
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