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Stability of Nonflowering Orchardgrass

^a USDA-ARS, U.S. Dairy Forage Research Center, Madison, WI 53706-1108
^b USDA-ARS, National Forage Seed Production Research Center, 3450 S.W. Campus Way, Corvallis, OR 97331-7102
^c Dep. of Crop and Soil Sci., 503 Bradfield Hall, Cornell Univ., Ithaca, NY 14853
^d Agriculture and Agri-Food Canada, Crops and Livestock Research Centre, 440 University Ave., Charlottetown, PEI, Canada C1A 4N6

View larger version (41K): [in a new window]   Fig. 1. Scatterplot of the first two principal components for 299 orchardgrass half-sib families and seven orchardgrass cultivars evaluated for maturity, panicle number, sparse-flowering plants, and nonflowering plants.

View larger version (28K): [in a new window]   Fig. 2. Exponential regression of population and location mean frequency of (A) stable sparse-flowering plants (SSFP) or (B) stable nonflowering plants (SNFP) on mean temperature of the coldest month during the experimental period of May 1998 to July 2000. The ranking of locations for mean temperature of the coldest month, from lowest to highest, was Ashland, Arlington, Charlottetown, Ithaca, and Corvallis.