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Variation in resistance to verticillium wilt within seedling populations of some lucerne medicago sativa cultivars



Variation in resistance to verticillium wilt within seedling populations of some lucerne medicago sativa cultivars



Plant Pathology 31(2): 179-186



Verticillium wilt was assessed in seeding populations of 5 lucerne varieties: 'Euver', 'Maris Kabul', 'Sabilt', 'Verneuil' and 'Vertus'. Visual assessments of disease severity in 'Vertus' were compared with estimates of fungal biomass obtained by a maceration-dilution plate method and glucosamine assays. Symptom severity correlated with the amounts of fungus present only at the lower disease ratings. In contrast, direct correlations were obtained between visually assessed disease severities and the chlorophyll contents of plant shoots. Wide variation in disease reaction type were found within populations of all 5 varieties and disease development differed in 2 environments with differing temperatures. The significance of these variations is discussed in relation to the genetic background of the host and studies on the biochemical basis of resistance to Verticillium wilt.

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Accession: 006893165

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