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The Journal of Heredity 1954:45(6):265-272
© 1954 The American Genetic Association 45:265-272

research-article

MICROSPOROGENESIS IN SOME COMMERCIAL POTATO VARIETIES

M. S. SWAMINATHAN*

Abstract

Microsporogenesis was studied in 12 American commercial potato varieties. All of them were characterized by the formation of tn valents and quadrivalents at diakinesis and metaphase I of meiosis. Nine quadrivalents were observed in a microsporocyte of ChippeWa. The maximum number of quadrivalents per cell observed in a coichicine-induced autotetraploid of a diploid species was eight. The varieties studied had several meiotic abnor malities and varying degrees of pollen abor-tion. All produced seed when Katahdin was used as the pollen parent. It is suggested from the results that S. tubersum originated as an autotetraploid.


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