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Susceptibility of Six Scots Pine Clones to the Pathogenic Fungus Gremmeniella abietina

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Genotypic variation in susceptibility to Gremmeniella abietina, an economically important fungal pathogen of conifers, was studied by artificially inoculating 23-yr-old grafted plants of six Scots pine (Pinus sylvestris L.) clones in a seed orchard. Two fungal isolates were used. The mycelium was inserted into the current year shoots in late winter and the length of the necrotic lesion caused by the fungus was measured the next spring. The growth and male flower production of the experimental shoots were also measured. The development of symptoms did not vary among the clones, but the location of the grafts within the orchard statistically significantly affected the length of necrosis. The clones differed significantly in regard to height and the production of male and female flowers. Differences in flowering intensity among the clones were not connected with the development of G. abietina. At the level of the single shoot, the production of male flowers correlated positively with the length of necrosis. The length of necrosis correlated negatively with the length of current and previous year shoots. The ability of the two fungal isolates to cause necrosis differed significantly.
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Document Type: Research Article

Publication date: 2000-02-01

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