Canadian Forest Service Publications

Host preference of two Gremmeniella abietina varieties on balsam fir, jack pine, and black spruce in eastern Canada. 1996. Laflamme, G.; Ylimartimo, A.; Blais, R. Can. J. Plant Pathol. 18: 330-334.

Year: 1996

Available from: Laurentian Forestry Centre

Catalog ID: 16733

Language: English

CFS Availability: PDF (request by e-mail)

Abstract

Host preference of Gremmeniella abietina var. balsamea (GAB) originating from Picea mariana or Abies balsamea and of the North American race of G. abietina var. abietina (GAA-NA) originating from Pinus banksiana was tested by cross-inoculations on their original host species growing in a boreal forest in Quebec. Mycelia of six different isolates (two from each host of origin) were inoculated into cortical tissue of current shoots in late autumn and the length of the necrotic area was measured the next summer. These was evidence of host preference of the isolates. GAB caused more necrosis than GAA on P. mariana and A. balsamea, whereas it was the opposite situation on P. banksiana. The necrotic area on P. mariana was longer when caused by GAB originating from P. mariana than when caused by GAB originating from A. balsamea. The results are in agreement with the recent morphological, biochemical, and genetic separation of G. abietina into GAA and GAB. The results also support the recent DNA-based differentiation of GAB isolates according to the host genera Picea and Abies. We suggest that the genetic differentiation leading to separate genetic entities within G. abietina could be associated with host specialization.

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