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Latitudinal Adaptation of Switchgrass Populations

^a USDA-ARS, U.S. Dairy Forage Research Center, Madison, WI 53706-1108
^b USDA-ARS, 344 Keim Hall, Univ. of Nebraska, P.O. Box No. 830937, Lincoln, NE 68583-0937
^c Dep. of Plant and Soil Sci., Oklahoma State Univ., Stillwater, OK 74078-6028
^d USDA-NRCS, Plant Materials Center, 3800 S. 20th St., Manhattan, KS 66502

View larger version (32K): [in a new window]   Fig. 1. Linear regressions of mean biomass yield, expressed as deviations from location means, on location latitude for 20 switchgrass populations belonging to four germplasm groups. Linear regression coefficients for each population and group are listed in Table 4.

View larger version (28K): [in a new window]   Fig. 2. Linear regressions of mean survival, expressed as deviations from location means, on location latitude for 20 switchgrass populations belonging to four germplasm groups. Linear regression coefficients for each population and group are listed in Table 4.

View larger version (31K): [in a new window]   Fig. 3. Linear regressions of mean plant height, expressed as deviations from location means, on location latitude for 20 switchgrass populations belonging to four germplasm groups. Linear regression coefficients for each population and group are listed in Table 4.

View larger version (33K): [in a new window]   Fig. 4. Linear regressions of mean holocellulose concentration, expressed as deviations from location means, on location latitude for 20 switchgrass populations belonging to four germplasm groups. Linear regression coefficients for each population and group are listed in Table 4.

View larger version (27K): [in a new window]   Fig. 5. Scatterplot of the first two principal components for 10 traits of 20 switchgrass population evaluated at five locations. Kanlow is indicated by the arrow on each graph. The percentage of variation described by the first two principal components was 66% for Stillwater, 69% for Manhattan, 74% for Mead, 82% for Arlington, and 77% for Spooner.