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Winter Survival in Switchgrass Populations Bred for High IVDMD

^a USDA-ARS, 344 Keim Hall, P.O. Box 830937, Univ. of Nebraska, Lincoln, NE 68583-0937
^b Noble Foundation, P.O. Box 2180, Ardmore, OK 73402
^c Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
^d Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907-1150, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011 respectively

View larger version (16K): [in a new window]   Fig. 1. Development of switchgrass populations and families used to evaluate effect of selection for IVDMD on winter survival. "Cx" indicates the cycle of selection; C0 is the base population, positive "C" numbers indicate a generation of selection was practiced for high IVDMD while a negative "C" number indicates that selection was for low IVDMD. Arrows designate a generation.

View larger version (132K): [in a new window]   Fig. 2. EY x FF High IVDMD C4 switchgrass half-sib family space-transplanted selection nursery at Mead, NE, in 1995 showing differential survival among and within families.

View larger version (35K): [in a new window]   Fig. 3. Average monthly temperatures for Mead, NE, for the period 1991 through 1995.