Reference Report for IND84099304
| Title: | Accumulation of isoflavonoids and isoflavone glucosides after inoculation of soybean leaves with Xanthomonas campestris pv. glycines and pv. campestris and a study of their role in resistance. |
| Authors: | Fett, W.F. |
| Source: | Physiol. Plant Pathol. 1984, 24(3):303-320 |
| Abstract: | Pathogenic and nonpathogenic strains of X. campestris pv. glycines (causal agent of bacterial pustule disease of soyabean) or a strain of the soyabean nonpathogen X. campestris pv. campestris were tested for their ability to grow and induce accumulation of isoflavonoids (glyceollin, coumestrol, daidzein, formononetin and genistein) and isoflavone glucosides (daidzin, genistin and ononin) in leaves of Clark (susceptible to bacterial pustule) and Clark 63 (resistant to bacterial pustule, owing to the presence of the recessive rpx gene). Growth in vivo of nonpathogenic strains of pv. glycines and the strain of pv. campestris was highly restricted in Clark while bacterial growth kinetics of a pathogenic strain of pv. glycines in susceptible Clark and in resistant Clark 63 were similar. No, or very low levels ( less than 50 µg g-1 fresh weight) of, isoflavonoids, including glyceollin, accumulated by 4 days after inoculation of leaves of Clark or Clark 63 with bacterial strains which showed restricted growth in vivo. In general, high levels of isoflavone glucosides accumulated, but similar levels of isoflavone glucosides were found after inoculation with bacterial strains which were restricted or not restricted in their growth in vivo. In addition, the isoflavone glucosides were not inhibitory towards the xanthomonads in in vivo bioassays. Resistance to pathogenic strains of pv. glycines conditioned by rpx in Clark 63 appears unusual in that bacterial growth is not restricted, but rather symptomology is reduced with a lowering of the number of pustular lesions accompanied by aborted growth and early necrosis of the pustules. |
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