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A Test of Taxonomic Predictivity

Resistance to White Mold in Wild Relatives of Cultivated Potato

^a USDA, Agricultural Research Service, Dep. of Horticulture, Univ. of Wisconsin, 1575 Linden Drive, Madison, WI 53706-1590 USA
^b International Potato Center, P.O. Box 1558, La Molina, Lima 12, Peru

View larger version (18K): [in a new window]   Fig. 1. Cladistic relationships of potato, tomato, and outgroups, sensu Spooner and collaborators as described in text, showing the four clades in potato (1–4) and outgroup (5).

View larger version (29K): [in a new window]   Fig. 2. Mean rank scores for 34 species, based on the number of days each plant survived during the 14-d scoring period. High scores indicate resistance to white mold.

View larger version (17K): [in a new window]   Fig. 3. Box plots of six accessions of S. commersonii and S. bulbocastanum. The top whisker (vertical line) = 90th percentile, top of box = 75th percentile, median = wide horizontal line, bottom of box = 25th percentile, bottom whisker = 10th percentile, and dots = outliers. The y axis indicates the number of days that the plant survived during the 14-d observation period.

View larger version (43K): [in a new window]   Fig. 4. Average days to survival of white mold per area.

View larger version (17K): [in a new window]   Fig. 5. Correlogram for Day 11. The near-zero values of Moran's I in the residuals indicate that the spatial components are mainly captured by the 20 filters. Only at short distances (<500 km) does there seem to be a missing filter. However, the oscillation of Moran's I in the response variable (percentage dead plants) is an unusual pattern and reflects alternating similar and dissimilar patches. This graph is similar on all other days.

View larger version (19K): [in a new window]   Fig. 6. The relative contribution of space to the overall explained variation in the linear partial regression model. On average, the regression model explains <40%. On average, only 2% is explained from the spatial filters.