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Home → Publications → American Chestnut Proceedings → 1982 → Utilization of Chestnut Tannins By Endothia Parasitica

Utilization of Chestnut Tannins By Endothia Parasitica

ABSTRACT.--As an extension of previous work on the utilization of hamameli-tannin from the bark of blight-susceptible American and European chestnuts by Endothia parasitica, four other tannins were purified by semi-preparative high performance liquid chromatography and included, at a concentration comparable to that in the bark, as the only carbon source in a minimal medium inoculated with spores of E. parasitica. Two of the tannins, castalagin and vescalagin, had previously been shown to be present in susceptible and resistant (Chinese and Japanese) chestnuts. Two other unknown, late-eluting, and presumably higher molecular weight tannins from the bark and blight-resistant root bark of American chestnut were collected because of their high concentrations. The later eluting unknown tannin had a retention volume similar to that of a known procyanidin dimer of catechin and gave a colorimetric test for condensed tannins. All of the tannins were completely utilized by E. parasitica within four to ten days. Therefore it is concluded that chestnut tannins do not inhibit growth of E. parasitica but instead apparently support growth.


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Author(s): John Rush Elkins, Zane Lawhorn, Eric Weyand

Publication: American Chestnut Proceedings - 1982