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Isozyme Diversity in Wild Red Clover Populations from the Caucasus

^a Dep. of Agronomy and Soils, Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
^b USDA, ARS National Temperate Forage Legume Germplasm Resources Unit, 24106 N. Bunn Road, Prosser, WA, USA, 99350
^c V.I. Vavilov Plant Industry Institute, Bolshaya Morskaya 42, St. Petersburg, Russia 190000

View larger version (17K): [in a new window]   Fig. 1. Dendrogram of UPGMA clustering of 15 red clover populations from the Caucasus based on Rogers' genetic distance.

View larger version (110K): [in a new window]   Fig. 2. Location of the collection sites in the Caucasus and grouping of the 15 red clover populations based on geographic proximity of the collection sites.

View larger version (122K): [in a new window]   Fig. 3. Red clover collection sites plotted on a map illustrating elevation and watersheds: (a) group 1 sites were 7 km apart connected by valleys and with no obvious geographical barriers, (b) group 2 sites were only 1 km apart with no intervening land forms, (c) group 3 collection sites were isolated by two ridges separated by an intervening valley with steep changes in elevation, (d) sites for group 4 had no intervening barriers, had similar elevation and the sites were 24 km apart, (e) sites for group 5 were separated by intervening mountains and hills, furthermore, the sites were separated by distances that ranged between 23 and 52 km, (f) in group 6, some of the collection sites were isolated by distance and intervening hills whereas others were only separated by distance.