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Resistance to Gremmeniella abietina (European race, large tree type) in introduced Pinus contorta and native Pinus sylvestris in Sweden

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To study the resistance of Pinus contorta Dougl. ex Loud. var. latifolia Engelm. ex Watts to large tree type (LTT) Gremmeniella abietina (Lagerberg) Morelet of the European race, seedlings of P. contorta and Pinus sylvestris L. were planted in gaps of an infected 40-year-old P. sylvestris stand in 2005 and assessed for symptoms in 2006–2007. In 2007, 45% and 32% of the P. contorta and P. sylvestris seedlings were infected, respectively. However, mortality was lower and recovery was better in the P. contorta seedlings. The mean infection length on surviving seedlings was significantly shorter in P. contorta (4cm) compared with P. sylvestris (10cm), and 47% of the P. contorta seedlings had developed new leader shoots in 2007 compared with 19% of the P. sylvestris seedlings. Histopathological examinations of the transition zone of infected shoots showed that P. contorta, as well as P. sylvestris, produced ligno-suberized boundaries extending from healthy needle bases transversally across the shoots. Together with areas of phenol-filled cells, these boundaries completed the compartmentalization of the invaded outermost parts of a majority of the infected seedlings. Our results indicate that P.contorta is more resistant to LTT G. abietina than P.sylvestris.

Afin d’étudier la résistance de Pinus contorta Dougl. ex Loud. var. latifolia Engelm. ex Watts au type grands arbres (TGA) de la race européenne de Gremmeniella abietina (Lagerberg) Morelet, des semis de P. contorta et de Pinus sylvestris L. furent plantés en 2005 dans des trouées à l’intérieur d’un peuplement infecté de P. sylvestris âgé de 40 ans. Les symptômes furent évalués en 2006–2007. En 2007, respectivement 45 % et 32 % des semis de P. contorta et de P. sylvestris furent infectés. Cependant, la mortalité était plus basse et la récupération meilleure chez les semis de P. contorta. La longueur moyenne des infections sur les semis survivants était significativement plus courte chez le P. contorta (4cm) comparativement au P. sylvestris (10cm), et 47 % des semis de P. contorta avaient développé de nouvelles pousses en 2007, comparativement à 19 % chez les semis de P. sylvestris. Des examens histopathologiques de la zone de transition des pousses infectées montrent que le P. contorta, comme le P. sylvestris, forment une barrière ligno-subéreuse s’étendant de la base des aiguilles saines transversalement à travers les pousses. Avec les cellules remplies de phénols, ces barrières complètent le compartimentage des parties envahies les plus distantes de la majorité des semis infectés. Nos résultats indiquent que le P. contorta est plus résistant au TGA de G. abietina que le P. sylvestris.

Document Type: Research Article

Publication date: January 1, 2008

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