Glyceollin Accumulation in Soybean Lines Tolerant toPhytophthora megaspermaf. sp.glycinea

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Abstract
Wounded and unwounded hypocotyls and tap roots of soybean lines that have high or low tolerance to P. megasperma f. sp. glycinea were tested to determine whether glyceollin accumulation could account for tolerance. No correlation was shown. After inoculation into the lateral root area with compatible races, 4 types of lesions in the tap root were recognized. These were: no rot, 1-10 mm rot, rot to the hypocotyl-root junction, and rot into the hypocotyl. Only plants with hypocotyl rot died within 10 days; others were stunted and recovered. Time course of accumulation and concentration of glyceollin in tap roots suggests that glyceollin does not play a role in soybean tolerance. No fungitoxic compounds other than glyceollin were detected by TLC bioassay of infected roots.