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Cytology, Sex Expression, and Growth of a Tetraploid x Diploid Cross in Hop (Humulus lupulus L.)¹

A colchicine-induced tetraploid hop (Humulus lupulus L.) (2n=4x=40) crossed to selected diploid males produced 76% triploids in its progeny. Of the triploid survivors at maturity 71% were pistillate and 27% were monoecious wilh varying proportions of pistillate and staminate flowers. Triploids generally grew twice as fast as the tetraploiid parent and 20% faster than the corresponding diploid variety during the period of maximum longitudinal growth in the spring and early summer. Morphologically, most triploids resembled the female parent. Most of lhe fastest-growing triploids were amongthe top yielders.

Key Words: Vigor • Yield • Seed set • Polyploidy

² Research Geneticist, Plant Science Research Division, Agricultural Research Service, US Department of Agriculture, Corvallis, Ore. 97331.

Received for publication April 15, 1971.