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Genetic Progress From 50 Years of Smooth Bromegrass Breeding

^a Dep. of Agronomy, Univ. of Wisconsin-Madison, Madison, WI 53706-1597 USA
^b USDA/ARS, Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583 USA
^c Div. of Plant and Soil Sci., West Virginia Univ., Morgantown, WV 26506-6108 USA
^d USDA/ARS, Northern Great Plains Res. Ctr., Mandan, ND 58544 USA
^e Dep. of Crop Sci., Univ. of Illinois, Urbana, IL 61801 USA
^f Dep. of Plant Breeding and Biometry, Cornell Univ., Ithaca, NY 14853-1902 USA
^g Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506-5501 USA

View larger version (24K): [in a new window]   Fig. 1 Regression of 26 cultivar or experimental population means for brown leafspot reaction (BLS) on year of release or synthesis (Y). Each point is a mean over three replicates and 3 yr at Arlington, WI. The rating scale was: 0 = no symptoms, ..., 10 = leaves completely diseased

View larger version (24K): [in a new window]   Fig. 2 Cluster dendrogram of 27 smooth bromegrass clutivars or populations evaluated at three locations (Nebraska, North Dakota, and Wisconsin) for nine variables (first-harvest and regrowth forage yield, panicle height, maturity, ground cover, brown leafspot reaction, IVDMD, NDF, and N concentration). R2 = sum of squares among clusters ÷ total sum of squares among entries. Letters inside parentheses indicate meadow (northern) climatypes (M) or intermediate climatypes (I); all others are steppe (southern) climatype