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Horizontal transmission of the Picea glauca foliar endophyte Phialocephala scopiformis CBS 120377
Authors:J David Miller  Hafsa Cherid  Mark W Sumarah  Gregory W Adams
Institution:1. Ottawa-Carleton Institute of Chemistry, Carleton University, 228 Steacie Building, Ottawa, Ontario K1S 5B6, Canada;2. JD Irving Limited, Sussex Tree Nursery, 181 Aiton Road, Sussex, New Brunswick E4G 2V5, Canada
Abstract:We have studied the presence of the foliar endophtye of Picea glauca (white spruce) Phialocephala scopiformis CBS 120377 and its affect on the growth of Choristoneura fumiferana (spruce budworm). Here we examine the transmission of this fungus from 50 trees planted in a test field site to 250 P. glauca seedlings planted under the emerging canopies. After 3 y, the endophyte spread to 40 % of these trees (now 20–30 cm) with an average rugulosin (an anti-insect toxin) concentration of 1 μg g?1. All woody plants within 2 m of the test trees were collected. These were all shown to be negative for P. scopiformis except for some spruce seedlings that arose from seeds (natural generation). This is positive evidence for the horizontal transmission of P. scopiformis and its apparent specificity to P. glauca under field conditions.
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