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Medientyp:
E-Artikel
Titel:
Genotypic Variation in Plant Disease Resistance--Physiological Resistance in Relation to Field Disease Transmission
Beteiligte:
Alexander, Helen Miller;
Antonovics, Janis;
Kelly, Ann W.
Erschienen:
British Ecological Society, 1993
Erschienen in:Journal of Ecology
Sprache:
Englisch
ISSN:
0022-0477;
1365-2745
Entstehung:
Anmerkungen:
Beschreibung:
<p>1. Cloned genotypes of Silene alba differed in the percentage of plants that became diseased following floral and bud inoculation with six isolates of the fungus Ustilago violacea. 2. The three flower and bud inoculation methods used in the study had little effect on the resistance ranking of the genotypes. 3. No differences in virulence were found among the six fungal isolates. 4. Multiple regression analyses revealed that the percentage of diseased plants following inoculation was an important predictor of disease levels of the same genotypes in a field experiment with natural disease transmission. This result validates the use of inoculation methods for large-scale resistance testing in this system. 5. Floral phenology, a plant trait that affects the likelihood of spore deposition in the field, also accounted for a significant portion of the genotypic variation in field disease levels. 6. Thus, both physiological resistance and factors affecting transmission should be considered when interpreting patterns of disease incidence in nature.</p>