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Population Stability of ‘Latar’ Orchardgrass as Affected by Six Diverse Seed Production Environments¹

Six plant characteristics of ‘Latar’ orchardgrass (Dactylis glomerata L.) were studied at Prosser, Wash., to evaluate population stability after two generations of increase at four locations in the western USA and at two locations in Japan. Populations consisting of 108 spaced plants from each of 35 increases were compared to plants from the original seed lot used at the six locations to establish the initial seed increases. The two increases made at Sapporo, Japan, did not differ from the original seed, but the six increases made at Shafter, Calif., had less spring vigor, earlier date of heading, earlier date of anthesis, fewer number of heads, shorter plant height, and less stem angle. The six increases each made at Tehachapi, California, and Aurora, Ore., differed only in stem angle. The five increases made at Nishinasuno, Japan, and the 10 increases made at Prosser differed in three plant characteristics. First-generation seed increases tended to produce plants that were shorter, more erect, and less vigorous, with fewer heads and earlier heading and anthesis dates than plants from the original seed. Second-generation increases continued this trend and were significantly different from the original seed in five of six characters studied.

Key Words: Dactylis glomerata L Cocks foot • Genetic shift • Genetic stability • Seed production • Seed increases • Generations • Spaced plants

² Research agronomists, ARS-USDA, Prosser, WA 99350; Cheyenne, WY 82001 (formerly Shafter, CA 93263); Lafayette, 47907, Beltsville, MD 20705; and associate professor of agronomy, Oregon State Univ., Corvallis, OR 97331, respectively.

Received for publication June 30, 1977.