Clone by isolate interaction in the hybrid poplar – Septoria musiva pathosystem

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Abstract:

Fourteen clones of hybrid poplar were inoculated with 19 isolates of Septoria musiva Peck under greenhouse conditions to determine the magnitude of the clone, isolate, and clone × isolate interaction effects. Septoria musiva isolates were collected from five geographic areas, two symptoms (canker and leaf spot), and two host types (native species and hybrid poplar). The hybrid poplar clones were classified by parent type (Populus deltoides Bartr. ex Marsh., Populus laurifolia Lebed. × Populus nigra L., and P. deltoides × (P. laurifolia × P. nigra)). There were no significant differences among geographic areas (p = 0.443), symptoms (p = 0.842), or hosts (p = 0.304) of origin for the 19 isolates nor significant differences among the three parent types (p = 0.089). Clone, isolate, and clone × isolate interaction effects were all significant, accounting for 65%, 15%, and 18%, respectively, of the explained variation. These results indicate that clones rather than parent types should be the focus of resistance screening programs and that the pathosystem should be stable given the relatively small clone × isolate interaction. These results also indicate that a single isolate should be sufficient for preliminary screening of disease resistance in hybrid poplars.

Quatorze clones de peuplier hybride ont été inoculés avec 19 isolats de Septoria musiva Peck en serres pour déterminer l’effet des clones, des isolats et de l’interaction clones × isolats. Les isolats de S. musiva ont été récoltés dans cinq zones géographiques, associés à deux types de symptômes (chancre et tache de feuilles) et sur deux types d’hôtes (espèce indigène de peuplier et peuplier hybride). Les clones de peuplier hybride ont été classés selon le type de parents (Populus deltoides Bartr. ex Marsh., Populus laurifolia Ledeb. × Populus nigra L. et P. deltoides × (P. laurifolia × P. nigra)). Il n’y avait pas de différences entre les zones géographiques (p = 0,443), les types de symptômes (p = 0,842) ou les types d’hôtes (p = 0,304) quel que soit l’isolat, ni entre les trois types de parents (p = 0,089). Les effets des clones, des isolats et de l’interaction clones × isolats étaient tous significatifs et expliquaient respectivement 65%, 15% et 18% de la variation. Ces résultats indiquent que les programmes de sélection pour la résistance devraient mettre l’accent sur les clones plutôt que sur le type de parents et que le pathosystème devrait être stable étant donné que l’interaction clones × isolats est relativement faible. Ces résultats indiquent aussi qu’un seul isolat devrait suffire pour faire une sélection préliminaire pour la résistance à la maladie chez les peupliers hybrides.

Document Type: Research Article

Publication date: July 1, 2008

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