Resistance to bacterial wilt in tomato as discerned by spread of pseudomonas (Burkholderia) solanacearum in the stem tissues

Autor: S. Bart, Armelle Darrasse, Philippe Prior, G. Anais, S. Leclercq
Přispěvatelé: Unité de recherche Productions végétales (CRAG ANT PROD V), Institut National de la Recherche Agronomique (INRA), ProdInra, Migration
Jazyk: angličtina
Rok vydání: 1996
Předmět:
Zdroj: Plant Pathology
Plant Pathology, Wiley, 1996, pp.720-726
ISSN: 0032-0862
1365-3059
Popis: Different criteria were compared for assessing bacterial wilt resistance in 13 tomato genotypes varying in disease susceptibility. Wilt severity and bacterial invasiveness at collar and midstem were compared in the field under cooler (March to May, 20-28°C) and warmer months (June to August, 23-29°C), which were unfavourable and favourable to wilt symptom expression, respectively. A model was proposed for determining resistance regardless of climatic conditions prevalent during field experimentation. This model was based on an estimate of bacterial invasiveness termed the colonization index. Using a qualitative imprint method we confirmed that the more resistant the genotype, the lower the bacterial colonization of the stem. The colonization index accounted both for wilted plants and for infected asymptomatic plants in which Pseudomonas solanacearum populations failed to produce wilt. The colonization index at midstem was the more useful indicator of resistance under favourable conditions. When environmental conditions were unfavourable to wilt, colonization index at collar level discerned resistant genotypes more clearly. The results formed the basis for a model for predicting the degree and stability of resistance in tomato.
Databáze: OpenAIRE
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