Book of Abstracts (PDF) - International Mycological Association

IMC7 Main Congress Theme IV: POPULATION DYNAMICS AND ECOLOGY Posters
lacking for those in the Mediterranean area. The European
Confederation of Mediterranean Mycology (CEMM.ae)
recognized the need to fill these gaps and in 1999 research
was begun on fungal communities of Pinus sp. pl. woods
by mycologists of the three member countries (France,
Italy and Spain). Here, the first results of this work are
reported. Various species linked to pines or to the
Mediterranean environment were found. Some taxa present
in the Red Lists of central and northern European countries
were also present in the studied areas. The percentage of
mycorrhizal species was calculated for each permanent
plot. This percentage was found to reflect forest health in
northern and central Europe. Low values of this index for
some of the studied pine woods suggests that they are in a
state of decline. Classification and ordering of the relevés
showed affinities between the fungal communities.
998 - Interaction of arbuscular mycorrhizal fungi with
plant pathogens on Coffea arabica L.
L. Lebrón 1* , D.J. Lodge 2 & R. Rodríguez 3
1 Institute for Tropical Ecosystems Studies, University of
Puerto Rico-Rio Piedras, PO Box 23341, San Juan, PR
00931-3341, U.S.A. - 2 Center for Forest Mycology
Research, USDA Forest Service, Forest Products Lab, Box
1377,Luquillo, PR 00773, U.S.A. - 3 Crop Protection
Department, University of Puerto Rico-Mayagüez,
University Station,Mayagüez, PR. 00708, U.S.A. - E-mail:
llebron@upracd.upr.clu.edu
Interactions between AM fungi and a pathogen of coffee
leaves were investigated. First, we evaluated three coffee
cultivars for differences in the amount of AM extraradical
hyphae. Extraradical hyphae were significantly less in
Caturra than in Pacas and Borbón cultivars in all locations.
In another study, we compared the percentage of
mycorrhizal root length among paired coffee seedlings with
and without Cercospora coffeicola lesions. We found that
seedlings with pathogen lesions on the leaves had
significantly greater mycorrhizal colonization than
seedlings without lesions. In a third study, we evaluated
effects of mycorrhizae and soil nutrient levels on plant
growth and development of leaf lesions caused by C.
coffeicola. This experiment used the cultivars Caturra and
Borbón with four nutrient treatments: a control, 25 ppm
added N or P, and 25 ppm each of added N and P. Growth
in Caturra only responded to fertilization while growth in
Borbon only responded to mycorrhizae. The results also
suggested that there was a higher cost of mycorrhizal
association in Borbón than in Caturra. There were no
significant differences in lesion development among
treatments in two replicate experiments.
999 - Community structure of ectomycorrhizal fungi
beneath fruitbodies of Xerocomus subtomentosus,
Suillus luteus, Lactarius rufus and Scleroderma citrinum
T. Leski * & M.L. Rudawska
Institute of Dendrology, Polish Academy of Sciences,
Parkowa 5, 62-035 Kornik, Poland. - E-mail:
tleski@man.poznan.pl
The goal of our studies was to determine the
correspondence between above- and below-ground views
of species composition of ectomycorrhizal fungi in Scots
pine (Pinus sylvestris) stand in Poland. We sampled
mycorrhizas from soil cores taken directly below
fruitbodies of some ectomycorrhizal fungi, which appeared
with differentiated abundance on tested plots. Suillus
luteus, Lactarius rufus and Scleroderma citrinum were
among the most abundant fruitbodies and Xerocomus
subtomentosus belonged to rather rare specimen. All viable
ectomycorrhizas removed from cores taken directly below
fruitbodies were classified into morphotypes based on
color, size and type of ramification. On average 5-6
different ectomycorrhizal morphotypes were selected under
each species and mostly one or two morphotypes
dominated. RFLP analysis of the ITS region to identify
species in ectomycorrhizal communities confirmed
morphological typing. A few ectomycorrhizal tips
belonging to X. subtomentosus and S. citrinum were
detected in cores taken under these fruitbodies. In samples
taken beneath S. luteus and L. rufus root tips bearing
mycorrhizas of these species were lacking. The results
suggest that root tips of several ECM species coexist within
fruitbody of each particular species.
1000 - Switching partners: ecto- and arbuscular
mycorrhizal fungi on seedlings of three oak species
A. Lindahl 1* , L. Egerton-Warburton 2 , C. Blesdoe 3 , D.
Southworth 4 & M.F. Allen 1
1 Center for Conservation Biology, UC Riverside,
University Lab Building, Room 208, Riverside, CA 92521,
U.S.A. - 2 Chicago Botanic Garden, 1000 Lake Cook Road,
Glencoe, IL 60022, U.S.A. - 3 Universide of California,
Davis, 225 Hoagland Hall, One Shields Ave., Davis, CA
95616, U.S.A. - 4 Southern Oregon University, Science 159,
1250 Siskiyou Blvd., Ashland, OR 97520, U.S.A. - E-mail:
AmyL@citrus.ucr.edu
Interestingly, an increasing number of researchers have
shown that under field conditions, some Quercus species
may host both ecto- and arbuscular mycorrhizal fungi. This
ability to host arbuscular mycorrhizal (AM) fungi may
allow oaks to successfully establish beyond the
ectomycorrhizal (EM) root zone of mature oaks. In this
study, we considered how established EM and AM
communities might affect colonizing oak seedlings. Three
oak species (Quercus agrifolia, Q. garryana, and Q.
douglasii) were transplanted into a Southern Californian
Book of Abstracts 301