. 2003. Effect of the Nicotiana debneyi black root rot resistance gene on the yield and quality characteristics of flue-cured tobacco in Ontario. Can. J. Plant Sci. 83: 939-942. The effects of Nicotiana debneyi-derived resistance to black root rot disease were evaluated for yield, agronomic and quality traits by comparing the near isogenic cultivars AC Gayed (resistant) and Delgold (susceptible). Over 7 yr of trials the possession of resistance led to yields and economic returns that averaged 6 and 7% lower, respectively, than for the susceptible line. Les auteurs ont évalué les effets de la résistance de Nicotiana debneyi au pourridié noir sur le rendement, les paramètres agronomiques et la qualité du tabac en comparant les cultivars presque isogéniques AC Gayed (résistant) et Delgold (sensible). Au cours des sept années qu'ont duré les essais, les gènes de résistance ont entraîné une baisse moyenne du rendement et des recettes respectivement de 6 et de 7 % comparativement à la variété sensible.
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