Abstract
Desynaptic mutants of diploid potato (2n=2x=24) were found to produce a fairly high frequency of fertile 2n pollen grains. Such 2n pollen grains may be expected to originate through an equational division of the entire chromosome complement, and therefore, of first division restitution (FDR) origin. Since second division restitution (SDR) gametes in desynaptic mutants are expected to abort, because of the imbalance of chromosome number, the fertile 2n gametes may constitute homogeneous populations of FDR gametes. Among a total of 306 progeny derived from six crosses 76 desynaptic mutants were detected. Of these, 23 mutants were found to have more than 20% pollen fertility. Some of these fertile mutants were successfully used as pollen parents.
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