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The Nature of Resistance in Chrysanthemum Varieties To Aphelenchoides Ritzemabosi

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Leaves of resistant varieties of chrysanthemum brown quickly when infested with A. ritzemabosi. In such leaves there is no eelworm multiplication and so the infestation is isolated and does not spread. There is no difference in the rate of browning of aerated extracts of leaves of resistant and susceptible varieties and no differences in polyphenolic content or polyphenol oxidase concentration. Infested leaves of resistant and susceptible varieties brown at different rates because in leaves of resistant varieties the gravid females move about in the leaf, piercing hundreds of cells which subsequently turn brown. In susceptible varieties the females do not move, they pierce few cells and lay many eggs. This difference in behaviour is attributed to the absence of a nutritional factor in leaves of resistant varieties.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England

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/content/journals/10.1163/187529261x00270
1961-01-01
2016-12-07

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