Genetic evidence that butternut canker was recently introduced into North America
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Canadian Journal of Botany. 77: 783-785. (1999)
Butternut (Juglans cinerea) is seriously threatened by a canker disease caused by Sirococens clavigignenti-juglandacearum, a fungus with no known sexual stage. This pathogen was first reported in 1967 and is now found throughout the native range of butternut, suggesting that it was introduced into North America. We used randomly amplified polymorphic DNA (RAPD) markers to examine genetic variation in S. clavigignenti-juglandacearun over a large portion of the native range of butternut. The 55 RAPD fragments were all found in all 86 isolates of the fungus. This complete monomorphism is consistent with the fungus having been introduced into North America as a single isolate and suggests that if resistant butternut genotypes are found, the pathogen will not likely be able to rapidly evolve genotypes that can attack them.
KeywordsSirococcus clavigignenti-juglandacearum Juglans cinerea RAPD randomly amplified polymorphic DNA
Furnier, Glenn R.; Stoiz, Allison M.; Mustaphi, Raka M.; Ostry, Michael E. 1999. Genetic evidence that butternut canker was recently introduced into North America. Canadian Journal of Botany. 77: 783-785. (1999)