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Potential pollen contamination effects on progeny from an off-site Douglas-fir seed orchard: 9-year field results

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Abstract:

To evaluate the potential effects of seed orchard pollen contamination from surrounding background sources, we made control pollinations with outside orchard pollen and inside orchard pollen on trees of a Douglas-fir (Pseudo tsuga menziesii (Mirb.) Franco) coastal–interior transition zone seed orchard. The resulting progeny were tested on a transition zone and a coastal site. After nine growing seasons, survival was above 90% on both sites for both pollen sources, and the trees height differences due to pollen source were statistically nonsignificant. Wildstand operational seedlots, used as controls, were 17% shorter than the "contaminated" seedlings. Orchard management implications of these results are discussed.

Les auteurs ont voulu évaluer les effets potentiels de la contamination pollinique de sources environnantes de pollen au sein d'un verger à graines. À cette fin, ils ont effectué des pollinisations dirigées dans un verger à graines de douglas vert (Pseudotsuga menziesii (Mirb.) Franco) situé dans la zone de transition entre la côte et la région de l'intérieur à l'aide de pollen exogène et endogène au verger. Les descendances découlant des croisements ont été testées dans la zone de transition et la région côtière. Après neuf saisons de croissance, la survie était supérieure à 90 % aux deux endroits et pour les deux sources de pollen. Les différences de hauteur des arbres dues aux différentes sources de pollen étaient statistiquement non significatives. Des lots de semences opérationnels provenant de peuplements naturels ont été utilisés comme témoin. Les semis issus de ces lots étaient 17 % moins grands que les semis " contaminés ". Les auteurs discutent des implications de ces résultats pour la gestion des vergers.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: April 1, 2004

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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