Abstract
Tubers of virus-free Norland, Kennebec, Norchip, Russett Burbank, Red Pontiac, Norgold and Early Ohio potato varieties with a common environmental history were freeze-dried, and the major phosphorus-containing fractions determined. The method devised gave very reproducible values for phospholipid, nucleotide phosphorus, phytic acid phosphorus, starch phosphorus and nucleic acid phosphorus. Very little varietal differences were found as long as environmental factors were constant. The greatest variation was in inorganic phosphorus levels. There were no obvious relationships between protein level and any of the phosphorus-containing fractions.
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