Sessions Sponsored by the Forest Pathology Committee at the
2004 APS Annual Meeting

Meeting was held July 31 - August 4, 2004 , at the Anaheim Convention Center in Anaheim , California

Field Trip: Forest Pathology

7:30 a.m.
Friday, July 30 to 5:00 p.m. Saturday, July 31
Organizer: Dave Rizzo, University of California, Davis, CA
A two-day field trip to observe diseases of forest trees along the California coast will begin in San Jose , California . Buses left from the hotel at 7:30 a.m. on Friday and traveled to the Monterey Peninsula . The focus was on pitch canker and other diseases of Monterey pine. We then traveled to Big Sur and spent time hiking and observing sudden oak death and related diseases in several forest types. The trip continued along the California coast, ending the first day in the city of San Luis Obispo . Dinner and exploring the town was on your own Friday night. Saturday morning included traveling to Lake Arrowhead in the San Bernardino Mountains . The afternoon was spent observing root diseases, bark beetles, and damage from the fires of 2003. Anticipated arrival at the Hilton Anaheim was 5:00 p.m. Saturday, July 31. Field trip enrollment was limited to 47 participants. The registration fee is $130.00 and included transportation (luxury motorcoach), two box lunches and snacks. Lodging, breakfasts and dinners were not included.

Host-Microbe Interactions in Woody Plants
Monday, August 2

Sponsoring Committees:
Forest Pathology; Biochemistry, Physiology, and Molecular Biology
Organizers: Pierluigi Bonello, Ohio State University, Columbus, OH and Paul Zambino, US Forest Service, Moscow, ID.
In the past 20 years significant advances have been made in our understanding of host-microbe interactions, particularly through the manipulation of selected herbaceous model plant systems such as Arabidopsis and tobacco. While there are obstacles in manipulating trees, there are also tremendous opportunities to expand our knowledge of host-microbe interactions to a group of organisms that are a dominant feature in many terrestrial ecosystems and are of critical economic importance. Certain unique features of trees cannot be easily modeled using herbaceous systems, including the predominance of secondary tissues in trees; the existence of woody plant-specific defense mechanisms, such as the resin system in conifers and compartmentalization processes; and the large temporal and spatial scales at which defenses must presumably act given the longevity and size of trees. Furthermore, fundamental information is being generated in the field of plant-mycorrhizal fungus interactions, an area that is arguably better characterized in woody than in herbaceous plants. This symposium will focus on the latest discoveries in the areas of genomics, genetics, biochemistry, and cell and tissue biology of host-microbe interactions in woody plants, including pathogenic and mycorrhizal associations, and will provide a forum for the identification of future research directions.


Genomic approaches to understanding quantitative inheritance of disease resistance in forest trees. D.B. NEALE (1,2), E.S. Ersoz (1), G.R. Brown (1), A. Morse (3), and J.M. Davis (3).(1) University of California, Davis, CA; (2) USDA Forest Service, Davis, CA; (3) University of Florida, Gainesville, FL

Genetic architecture of loblolly pine interactions with contrasting pathogens. J.M. DAVIS (1), A.M. Morse (1), D.A. Huber (1), C.D. Nelson (2), and S.F. Covert (3). (1) University of Florida, Gainesville, FL; (2) USDA Forest Service, Saucier, MS; (3) University of Georgia, Athens, GA

Anatomy, histochemistry, and cytochemistry of host-pathogen interactions in conifers. V.R. FRANCESCHI. Washington State University, Pullman, WA

Fine anatomy and chemical characterization of compartmentalization processes in response to Dutch elm disease and Scleroderris canker. D. RIOUX. Canadian Forest Service, Sainte-Foy, QC, Canada

Biochemistry of localized and systemic induced defense responses in pine. P. BONELLO. Ohio State University, Columbus, OH

Exploring the transcriptome of the ectomycorrhizal symbiosis. A. KOHLER, M. Peter, A. Jambois, P.E. Courty, S. Duplessis, F. Lapeyrie, and F. Martin. INRA, Champenoux, France

Relevance of herbaceous plant models to understanding and manipulating disease resistance in woody plants. A.F. BENT. University of Wisconsin, Madison, WI


Co-Evolutionary Processes of Introduced Pathogens and Hosts in Natural Ecosystems Monday, August 2

Sponsoring Committees: Forest Pathology, Graduate Student
Organizers: Bryce Richardson, Mee-Sook Kim, and Ned Klopfenstein, USDA Forest Service, Moscow, ID
Introduced pathogens have produced many classic examples of ecosystem devastation. However, for many pathosystems, co-evolutionary processes should cause decreases in pathogen aggressiveness and increases in host resistance. Understanding naturalization processes of introduced pathogens is critical to fostering recovery of natural ecosystems. This symposium offers valuable insights into the growing fields of evolutionary epidemiology and population genetics.
Implications of molecular evidence on the evolution of Melampsora and other rust fungi. M. Pei, University of Bristol, Bristol, UK

A phylogeographical history of Mycosphaerella graminicola on wheat. B.A. McDonald, Swiss Federal Institute of Technology, Zurich, Switzerland

Epidemiology meets genetics: The evolution of virulence in a natural plant-pathogen association. P. Thrall, CSIRO Plant Industry, Canberra, ACT, Australia

Inferring patterns of migration and gene flow in introduced populations of plant pathogens using the chickpea pathogen Ascochyta rabiei as a model. T.L. Peever, Washington State University, Pullman, WA

Exotic and native rust pathosystems: A population genomics approach. R. Hamelin, Natural Resources Canada, Sainte-Foy, QC, Canada

Implications from deep phylogeographical histories on pathosystem endemism. G. McDonald, USDA Forest Service, Moscow, ID