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Biochemical Response of Soybean Roots to Fusarium solani f. sp. glycines Infection

^a Dep. of Crop Sciences, Univ. of Illinois, 1201 Gregory Dr., Urbana, IL 61801
^b USDA-ARS, 1101 W. Peabody, Urbana, IL 61801-4723

View larger version (62K): [in a new window]   Fig. 1. Plants of partially resistant genotype ‘PI 567374’ inoculated with Fusarium solani f. sp. glycines (FSG) 7 d after planting.

View larger version (27K): [in a new window]   Fig. 2. The percentage of various isoflavonoids of total isoflavone fractions extracted from either upper or lower root parts of ‘PI 520733’, ‘PI 567374’, and ‘Spencer’, either inoculated or not inoculated with Fusarium solani f. sp. glycines 7 d after planting. Bars represent standard errors of the means. Daidzin, 7-O-glucosyl daidzein; MGD, 6''-O-malonyl-7-O-glucosyl daidzein; MGGn, 6''-O-malonyl-7-O-glucoside genistein; MGGl, 6''-O-malonyl-7-O-glucosyl glycitein.

View larger version (15K): [in a new window]   Fig. 3. Inhibition of radial growth of Fusarium solani f. sp. glycines (FSG; Mont1 isolate) measured after 14 d. Bars represent standard errors of the means.

View larger version (16K): [in a new window]   Fig. 4. Effect of 75-µM glyceollin on the radial growth of four different Fusarium solani f. sp. glycines (FSG) isolates measured after 14 d. Bars represent standard errors of the means.