Rising out of the ashes: Additive genetic variation for crown and collar resistance to Hymenoscyphus fraxineus in Fraxinus excelsior

Munoz Facundo, Marçais Benoît, Dufour Jean, Dowkiw Arnaud. 2016. Rising out of the ashes: Additive genetic variation for crown and collar resistance to Hymenoscyphus fraxineus in Fraxinus excelsior. Phytopathology, 106 (12) : 1535-1543.

https://doi.org/10.1094/phyto-11-15-0284-r

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Url - autres données associées : https://github.com/famuvie/2016_RisingAshes

Quartile : Q1, Sujet : PLANT SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Since the early 1990s, ash dieback due to the invasive ascomycete Hymenoscyphus fraxineus is threatening Fraxinus excelsior in most of its natural range. Previous studies reported significant levels of genetic variability in susceptibility in F. excelsior either in field or inoculation experiments. The present study was based on a field experiment planted in 1995, 15 years before onset of the disease. Crown and collar status were monitored on 777 trees from 23 open-pollinated progenies originating from three French provenances. Health status was modeled using a Bayesian approach where spatiotemporal effects were explicitly taken into account. Moderate narrow-sense heritability was found for crown dieback (h2 = 0.42). This study is first to show that resistance at the collar level is also heritable (h2 = 0.49 for collar lesions prevalence and h2 = 0.42 for their severity) and that there is significant genetic correlation (r = 0.40) between the severities of crown and collar symptoms. There was no evidence for differences between provenances. Family effects were detected, but computing individual breeding values showed that most of the genetic variation lies within families. In agreement with previous reports, early flushing correlates with healthier crown. Implications of these results in disease management and breeding are discussed.

Mots-clés Agrovoc : Fraxinus excelsior, théorie Bayésienne, dépérissement terminal, variation génétique, Houppier, champignon pathogène, maladie des plantes

Mots-clés complémentaires : Hymenoscyphus Fraxineus, modélisation spatio-temporelle

Mots-clés libres : Genetic variability, Ash dieback, Bayesian analysis, Spatio-temporal modelling

Classification Agris : H20 - Maladies des plantes
K70 - Dégâts causés aux forêts et leur protection
F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

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