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Studies On the Mechanism of Resistance of Wheat To Heterodera Avenae

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The number of larvae of H. avenae penetrating, establishing and developing at different inoculum densities in susceptible (cv. Halberd) and resistant (cvs. AUS 10894 and AUS 90248) wheat was similar when only one root per seedling was inoculated. At low inoculum densities, similar numbers of adult females developed on the three cultivars, but when the initial density was increased, fewer females developed on resistant roots and fewer developed on AUS 10894 than AUS 90248 (Loros). When the same root of AUS 10894 was inoculated twice, larvae in the second inoculation did not penetrate. Resistance was induced within 12 hrs. Such induced resistance was not transferred to uninoculated roots of the same seedling. Variations in the number of females that developed on resistant cultivars were partly due to the relationship between induced resistance and inoculum density. Therefore, it is unlikely that the few females that developed on the resistant cultivars represented a more virulent race of H. avenae.

Affiliations: 1: Department of Plant Pathology, Waite Agricultural Research Institute, University of Adelaide, Glen Osmond, South Australia, 5064


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