Abstract
Qualitative resistance to Melampsora larici-populina leaf rust inherited from North American species Populus deltoides did not allow for durable control of this pathogen in interspecific hybrid cultivars. Despite significant levels of strain-specificity, quantitative resistance would exert lower selection pressures on the pathogen populations, and hence could be more durable. Previous studies restricted to a large P. × interamericana (i.e., P. deltoides × Populus trichocarpa) F1 family revealed that the presence of R1, a segregating defeated qualitative resistance gene inherited from P. deltoides, had major beneficial effects on quantitative resistance. The present study was based on 14 F1 families from a 4 × 5 P. deltoides × P. trichocarpa factorial mating design where at least four defeated qualitative resistances segregate 1:1. Even though quantitative resistance assessments were conducted in the laboratory with a M. larici-populina strain able to overcome these qualitative resistances, their presence had a significant effect on the mean level and on the genetic variability for quantitative resistance. One unprecedented result is the identification of a defeated qualitative resistance which presence is associated with lower levels of quantitative resistance. Possible inferences on the nature of the genetic relationship between both resistance types are discussed.
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Acknowledgements
Financial support was provided by grants from INRA, Région Centre, and the French Ministry for Agriculture and Fisheries. We thank A. Legout, student at Ecole Supérieure d’Ingenieurs et de Techniciens pour l’Agriculture (ESITPA), for his involvement in this work; D. Lacan, P. Poursat, and their collaborators at the Unité Expérimentale of INRA Orléans for excellent technical assistance; J. Pinon and the Forest Pathology Laboratory of INRA Nancy for providing the rust inocula; G. Newcombe from the University of Idaho and three anonymous reviewers for their helpful comments on the manuscript; and A. Rae from the University of Southampton for her precious help with the English language.
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Dowkiw, A., Bastien, C. Presence of defeated qualitative resistance genes frequently has major impact on quantitative resistance to Melampsora larici-populina leaf rust in P. × interamericana hybrid poplars. Tree Genetics & Genomes 3, 261–274 (2007). https://doi.org/10.1007/s11295-006-0062-0
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DOI: https://doi.org/10.1007/s11295-006-0062-0