Book of Abstracts (PDF) - International Mycological Association

IMC7 Main Congress Theme II: SYSTEMATICS, PHYLOGENY AND EVOLUTION Posters
650 - The mating relationships of the S and F groups of
Heterobasidion annosum in Northern Hemisphere
Y.C. Dai 1* , T. Niemelä 2 & K. Korhonen 3
1 Institute of Applied Ecology, Academia Sinica, Shenyang
110016, Wenhua Road 72, China. - 2 Botanical Museum,
University of Helsinki, P.O. Box 47, FIN-00017, Finland. -
3 Finnish Forest Research Institute, P.O. Box 18, FIN-
01301 Vantaa, Finland. - E-mail: yuchengd@yahoo.com
Pairings made among homokaryons of Heterobasidion
parviporum Niemelä & Korhonen (S group of the H.
annosum complex) from Europe, Northeast China and
Northwest North America, and the European H. abietinum
Niemelä & Korhonen (F group) showed that the Northeast
Chinese S has the strongest mating capacity among all the
testers, being closely related with the European S and F,
and also the North American S. The North American S is
more readily compatible with the European F than with the
European S, and it seems that the so-called North
American S group should be referred to the European F
group rather than the European S. Samples collected from
North Yunnan (eastern foothills of the Himalayas, China)
were paired with testers of the S group from NE China,
with P, S and F groups from Europe, and S group from NW
North America; the Yunnan stocks mated with all the
testers by frequency over 90%. This suggests that the
Yunnanese stocks have the largest effective population
size.
651 - Systematics and evolution of Gomphales
(Basidiomycetes)
P.P. Daniëls * , M.P. Martín & M.T. Tellería
Real Jardín Botánico, C.S.I.C., Plaza de Murillo, 2, 28014
Madrid, Spain. - E-mail: daniels@ma-rjb.csic.es
The order Gomphales enclose eight genera in the world and
Ramaria is the main one in relation to species number.
Previous systematic arrangement in subgenus Ramaria was
proposed by Frachi & Marchetti (2001, Fungi non
delineati. 16). This subgenus was divided into ten sections
only based upon the presence/absence of clamped hyphae
and the basidiome colour. As part of a monograph of the
Iberian Gomphales a phylogenetic study in Gomphales
focused on Ramaria has been undertaken. Thirty-four
species of Ramaria as well as other genera of Gomphales
were included in the phylogenetic analysis based on ITS
and 5.8S rDNA sequences. Moreover, phylogenetic
analysis of the morphological characters were done on
clavarioid basidiomes. The very variable ITS regions gave
low bootstrap values but it can be deduced some
considerations about the systematics and evolution of the
Gomphales: 1) Subgenus Echinoramaria is monophyletic.
2) Ramaria is a genus related with several taxa among the
Gomphales, Gautieria morchellaeformis is related with
Section Ramariae and Gomphus clavatus with Section
Fennicae. 3) Ramaria bataillei and R. pumila seems to be a
bridge between the ectomycorrhizal and the saprobic
Ramarias. 4) Lentaria and Hydnocristella are closely
related with subgenus Lentoramaria. 5) The gelatinose
texture of the fruitbodies seems to be a synapomorphy. 6)
Clamp connections and fruitbody colour are very
homoplasic characters and do not serve to divide sections
among Ramaria.
652 - Another canker-causing aerial Phytophthora from
forest trees in California and Oregon
J.M. Davidson 1 , M.M. Garbelotto 2 , E.M. Hansen 3* , P.
Reeser 3 & D.M. Rizzo 1
1 Plant Pathology, University of California, Davis CA
95616, U.S.A. - 2 Environmental Science Policy and
Management, U. C. Berkeley, Berkeley CA 94720, U.S.A. -
3 Botany and Plant Pathology, Oregon State University,
Corvallis OR 97331, U.S.A. - E-mail:
hansene@bcc.orst.edu
Two distinct Phytophthora species cause similar symptoms
on several western forest trees. P. ramorum causes lethal
cankers (sudden oak death) on tanoak and coast live oak
trees and foliar and dieback symptoms on other tree and
shrub species in some western forests. A second
Phytophthora species, previously undescribed, is
occasionally isolated from lethal cankers on tanoak and
coast live oak, and from foliar lesions on Umbellularia and
other hosts, in areas where P. ramorum is also active. ITS
DNA sequence indicates close relationship to P. ilicis (a
foliar pathogen of holly) and P. psychrophila (newly
described from European oak forest soils). It is homothallic
with amphigynous antheridia, and has deciduous sporangia.
It grows more slowly, with a lower temperature optimum,
than P. ramorum. In log inoculation tests it is nearly as
pathogenic to tanoak as P. ramorum. It does not infect
holly leaves in leaf inoculation tests. In the forest it is
usually associated with single killed trees, in contrast to the
expanding patches of mortality caused by P. ramorum.
653 - Endophytes from leafy liverworts: a molecular
phylogenetic perspective
C. Davis
Duke University, Biological Sciences, Box 90338, Durham,
NC, U.S.A. - E-mail: ecf5@duke.edu
It has long been known that leafy liverworts possess
endophytic fungi, but these fungi have not previously been
identified with precision. Here, I present results of
molecular phylogeny as the means to identify these
endosymbionts from selected leafy liverworts. I address
possible explanations for the nature of such symbioses. I
discuss hypotheses regarding liverwort structural
adaptations for endosymbiosis, and explore methodology to
test these hypotheses.
Book of Abstracts 197