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Effects of Two Diverse Environments on Seed Production Characteristics of the Parent Clones of ‘Vantage’ Reed Canarygrass¹

Differences in pollination and seed yield among clones of forage grasses may alter genetic composition of seed lots. Eight characteristics of the six parent clones of ‘Vantage’ reed canarygrass (Phalaris arundinacea L.) were investigated at Prosser, Wash., and Ames, Iowa, in 1973 and 1974 in relation to the genetic composition of breeder seed lots produced at the two locations. Similarities among location-year combinations in rankings of the clones were evident for each trait. Range among clones in the date pollen shedding began was 3 or 4 days except at Prosser in 1973 when it was 8 days. Pollen shedding periods of the six clones always overlapped. In 1973, range among clones for panicle number and florets per panicle was 2.6 and 2.1 times greater, respectively, at Prosser than at Ames. In 1974, ranges were similar at the two locations. Range among clones in percentage seed set was greater at Prosser both years. Overall means at Ames and Prosser were, respectively, 213 and 280 panicles/ plant, 645 and 896 florets/panicle, 79 and 70% seed set, 88 and 92 mg/100 seeds, and 42 and 102 g of seed/plant. Except for percentage seed set and weight of 100 seeds, all location differences were significant. Seed yield per plant at Prosser was 2.4 times that at Ames. Breeder seed lots produced in the 2 years at the two locations may not be similar in genetic composition.

Key Words: Phalaris arundinacea L. • Genetic stability • Components of seed yield • Anthesis Synthetic variety

² Research agronomist, ARS, USDA, Professor, Wash.; professor of agronomy, Iowa State Univ., Ames; and agriculturist, ARS, USDA, Beltsville, Md. (formerly investigations leader, Forage and Range Research Branch, ARS, USDA).

Received for publication October 9, 1976.