Variation in pitch canker resistance among provenances of Pinus patula and Pinus tecunumanii from Mexico and Central America

Pinus patula and high-elevation (HE) sources of P. tecunumanii exhibit intermediate levels of resistance to pitch canker (Fusarium circinatum), compared to extremely resistant species such as P. oocarpa, and extremely susceptible species such as P. radiata. Seedlings from 20 P. patula provenances an...

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Bibliographic Details
Published in:New forests 2007-03, Vol.33 (2), p.193-206
Main Authors: Hodge, G. R, Dvorak, W. S
Format: Article
Language:English
Subjects:
Artificial inoculation
Elevation
Forestry
Fusarium circinatum
Pine trees
Pinus
Pinus patula
Plant reproduction
Plant resistance
Provenance variation
Seedlings
tree diseases
Trees
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Summary:Pinus patula and high-elevation (HE) sources of P. tecunumanii exhibit intermediate levels of resistance to pitch canker (Fusarium circinatum), compared to extremely resistant species such as P. oocarpa, and extremely susceptible species such as P. radiata. Seedlings from 20 P. patula provenances and 15 HE P. tecunumanii provenances were artificially inoculated with the pitch canker fungus at 21 and 12 weeks of age, respectively, and assessed for resistance 12-20 weeks later. There was important provenance variation in pitch canker resistance for both species. The 20-week LiveStem percentage ranged from 70.3% to 43.6% among the P. patula provenances and 59.6% to 11.7% among HE P. tecunumanii provenances. There was a geographic pattern to the provenance variation, and in both species, low altitude sources demonstrated more resistance than those from high elevation. Provenance variation in pitch canker resistance could be useful when making selection and breeding decisions with these species.
ISSN:0169-4286
1573-5095
DOI:10.1007/s11056-006-9023-6