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Breeding Systems in Annual Bluegrass, Poa annua. L.¹

Evidence is presented which indicates that apomixis does not operate in annual bluegrass (Poa annua L.) and that seed production and viability are good following either self- or cross-fertilization. Annual bluegrass was shown to possess a remarkable ability to ripen viable seeds on panicles excised from the plant 1 or 2 days after pollination. This characteristic is considered to be the most important attribute in determining the success of annual bluegrass as a weed of arable land and of mown pastures and turf.

Key Words: Apomixis • Pollen fertility • Seed-set • Self- and open-pollination • Seedling vigor • Seed maturation period

² Present address: Department of Genetics, Macdonald College, McGill University, Montreal-2, Canada.

Received for publication June 3, 1968.