Interactions Between French Isolates of Phomopsis/Diaporthe Helianthi Munt.-Cvet. et al. and Sunflower (Helianthus annuus L.) Genotypes |
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Authors: | Anne Viguié Felicity Vear Denis Tourvieille de Labrouhe |
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Institution: | (1) INRA, GREAT, Station d'Amélioration des Plantes et de Pathologie végétale, 234 Avenue du Brézet, 63039 Clermont-Ferrand Cedex 02, France |
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Abstract: | Three artificial infection tests measuring the rate of mycelial growth of 7 Phomopsis/Diaporthe helianthi isolates were used on leaves, stems and capitula of 6 sunflower hybrids. Isolates and hybrids were chosen to cover the range of variability and resistance levels known at the present time. Significant genotype and isolate effects and isolate×genotype interactions were shown in all the tests, with some changes in order of hybrids according to the isolate used for infection. Consequences of interactions in breeding for stable resistance to P./D. helianthi are discussed. |
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Keywords: | aggressivity artificial infection tests isolate× genotype interaction intraspecific variability Phomopsis stem canker |
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