Mycoflore des aiguilles de Pinus banksiana et Pinus resinosa. I. Champignons endophytes

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Abstract
The nature and distribution of the endophytic mycoflora isolated from healthy needles of Pinus banksiana and Pinus resinosa growing in plantations or natural stands infected with Scleroderris canker were investigated. Overall colonization rates of the needles were 68 and 89% for P. banksiana and P. resinosa, respectively, and were generally higher in closed canopy stands. For a given tree, colonization rates increased with foliage age but were not influenced by twig orientation. Colonization rates by more than one fungal species were 17% for P. banksiana and 76% for P. resinosa. Two different endophytic species could be found inside the needles of P. banksiana and up to seven in P. resinosa. Brunchorstia pinea, causal agent of Scleroderris canker, was not isolated. Commonly isolated endophytic fungi show a strong preference toward their host: the endophytic mycoflora of P. banksiana needles is almost limited to Coccomyces sp. while Pragmopycnis sp. and three Leptostroma species account for most of the isolates from P. resinosa.