Inoculum 56(4) - Mycological Society of America
Inoculum 56(4) - Mycological Society of America
Inoculum 56(4) - Mycological Society of America
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nizing fungi on bay laurel, both epiphytes and endophytes, may influence the establishment<br />
<strong>of</strong> Pr on this host. To understand the diversity <strong>of</strong> the fungal community<br />
associated with bay laurel leaves, we are using both cultural and molecular<br />
methods. The primers ITS1F and LR3 were used to amplify a region that includes<br />
the highly variable ITS regions but also covers the conserved LSU-rDNA. Preliminary<br />
data has demonstrated a diverse assemblage <strong>of</strong> phyllosphere fungi based<br />
on clones derived from DNA extractions from adhesive tape strips applied to the<br />
leaf surface. We also found that most clones could not be identified because no<br />
close matches were found in the ITS regions and only the 5.8s region gave strong<br />
hits based on BLAST searches. However, the clones could be identified with better<br />
solution based on LSU-rDNA. In contrast, most fungi cultured from leaf surfaces<br />
were represented in GenBank based on ITS. This suggests that the unidentifiable<br />
epiphytes are possibly unculturable using standard approaches and/or may<br />
be unknown taxa. poster<br />
Dubey, Tara. AerotechP&K, 1220 Quarry Lane, Pleasanton CA 94<strong>56</strong>6, USA.<br />
TDubey@aerotechpk.com. Factors affecting the collection <strong>of</strong> air samples for<br />
spore counts.<br />
Spore trap analysis for counting fungal spores present in the air, serves as<br />
primary criteria for the detection <strong>of</strong> mold problem present inside a building.<br />
Severity <strong>of</strong> the mold problem inside a building is estimated by comparing the<br />
presence or absence <strong>of</strong> genera in out door samples and by comparing if indoor<br />
spore counts are higher than outdoor spore counts. In order to make these techniques<br />
more dependable, it is essential to understand the effect <strong>of</strong> various natural<br />
and technical factors influencing the spore distribution in outdoor environment.<br />
Air samples from outdoor air were analyzed to see fungal diversity and their distribution<br />
pattern during different hours <strong>of</strong> the day to see the effect <strong>of</strong> light, temp.<br />
humidity, wind and volume <strong>of</strong> the sampled air. Samples were collected for 5 minutes<br />
at different times <strong>of</strong> the day (8am, 12pm, 4pm, 8pm, 12 am, and 4am), and<br />
at 12 noon for different durations (5, 10, 30, and 60 minutes) with a rate <strong>of</strong> 15<br />
liters/minute. A comparison <strong>of</strong> percent trace analyzed (15%, 25% and 100%) indicated<br />
the significant counts lost due to partial analysis <strong>of</strong> a trace. Over all, Cladosporium,<br />
Penicillium/Aspergillus. were most predominating spore types followed<br />
by Alternaria, Rust/Smut types <strong>of</strong> spores. Maximum spore count was seen<br />
during morning indicating the significant role <strong>of</strong> sunlight in spore releasing<br />
process. poster<br />
Dulmer, Kristopher M. and Horton, Thomas R.* Environmental Forest Biology,<br />
State University <strong>of</strong> New York- Environmental Science and Forestry, Syracuse,<br />
NY 13210, USA. kdulmer@hotmail.com. Evidence that <strong>America</strong>n chestnut<br />
seedlings tap into existing ectomycorrhizal networks <strong>of</strong> non-chestnut hosts.<br />
The ectomycorrhizal (EM) communities <strong>of</strong> <strong>America</strong>n chestnut (Castanea<br />
dentata) (AC) were explored in a forest setting in order to evaluate their potential<br />
for associating with EM networks <strong>of</strong> canopy trees. AC seed were planted in spring<br />
in three different red and white oak dominated sites in New York State and harvested<br />
5 months later. Seedlings were harvested using a 10cm soil corer to include<br />
bulk soil with intermingling roots <strong>of</strong> canopy trees. The seedlings and bulk soil<br />
were cleaned and all <strong>of</strong> the ectomycorrhizae were morphotyped. Molecular techniques<br />
(PCR amplification and RFLP analysis) were used to compare and identify<br />
plant and fungal genotypes <strong>of</strong> all morphotypes. Fungal and plant specific ITS<br />
primers were used to identify the symbionts. There were 74 different fungal RFLP<br />
types found across the 30 soil cores. Of the 36 RFLP types found on AC, 28 were<br />
multi-host fungi, 8 were found solely on AC, four <strong>of</strong> which were represented by<br />
only one sample. There were 24 EM fungi found on AC and another host within<br />
the same core. Red oak was most commonly found sharing the same RFLP type<br />
with AC (23 times) followed by white oak and <strong>America</strong>n beech (7 times each),<br />
and eastern hemlock, white pine and black birch (2 times each). These results suggest<br />
there is a high potential that AC seedlings are tapping into the EM networks<br />
supported by canopy trees. contributed presentation<br />
Dunham, Susie M.* and Spatafora, Joseph W. Department <strong>of</strong> Botany and Plant<br />
Pathology, Oregon State University, Corvallis OR, 97331, USA. dunhams@science.oregonstate.edu.<br />
Species diversity and encounter rates for mat forming<br />
ectomycorrhizal fungi in Douglas fir forests at the HJ Andrews experimental<br />
forest, Oregon, USA.<br />
Dense hyphal mats formed by ectomycorrhizal fungi can contribute up to<br />
40% <strong>of</strong> the microbial biomass in Pacific Northwest forest soils. Past research has<br />
shown that EcM mats are formed by fungi from distinct clades <strong>of</strong> the Basidiomycota<br />
(e.g., Hysterangiales and Gomphales). To further define the diversity <strong>of</strong><br />
fungi forming EcM mats we sampled and phylotyped <strong>56</strong> mats from 17 old growth<br />
(350+ yrs) sites and 37 mats from 14 second growth (40-60 yrs) sites. Sampling<br />
was restricted to forest sites dominated by Douglas fir (Pseudotsuga menziesii).<br />
Within each age class mats formed by Piloderma species were encountered most<br />
frequently with 61% and 53% <strong>of</strong> respective old growth and second growth mats<br />
belonging to this genus. We identified four total ITS sequence variants within Piloderma<br />
cf. fallax and cf. byssinum. Following Piloderma the second most commonly<br />
encountered genus in old growth was Ramaria, in second growth Hysterangium.<br />
All other species encountered were relatively uncommon. Overall, 18<br />
mat forming species were encountered in old growth, 11 in second growth. Rarefaction<br />
analyses indicate that the diversity <strong>of</strong> mat forming species is significant-<br />
MSA ABSTRACTS<br />
ly lower in second growth stands. This research highlights the potential importance<br />
<strong>of</strong> Piloderma in forest soils and the need for a better taxonomic understanding<br />
<strong>of</strong> this genus. symposium presentation<br />
Dunham, Susie M. 1 *, Spatafora, Joseph W. 1 and Kretzer, Annette M. 2 1 Department<br />
<strong>of</strong> Botany and Plant Pathology, Oregon State University, Corvallis OR<br />
97331, USA, 2 Faculty <strong>of</strong> Environmental and Forest Biology, SUNY College <strong>of</strong><br />
Environmental Science and Forestry, Syracuse, NY 13210, USA. dunhams@science.oregonstate.edu.<br />
The utility <strong>of</strong> genetic spatial autocorrelation analyses in<br />
fungal population biology.<br />
Cryptic growth habits make fungal individuals difficult to observe and hinders<br />
hypotheses testing about life histories <strong>of</strong> important species. Knowledge <strong>of</strong><br />
within-population genetic structure can yield important insights into population<br />
dynamics and spatial analysis <strong>of</strong> genetic data has potential for contributing to this<br />
research area. We used spatial autocorrelation analysis to study genet size in two<br />
Rhizopogon sister species. Within this context analysis <strong>of</strong> genetic relatedness as a<br />
function <strong>of</strong> spatial distance provides an accurate measure <strong>of</strong> genet size estimated<br />
across all genets sampled. At larger spatial scales patterns <strong>of</strong> genetic isolation<br />
<strong>of</strong>ten are estimated with allele frequencies calculated from predefined sampling<br />
units. Precision <strong>of</strong> these statistics declines when sampling units encompass multiple<br />
random breeding units (neighborhoods) as the genetic variance among sampling<br />
units, relative to the total, declines and the power to detect genetic structure<br />
is lost. We analyzed the degree <strong>of</strong> genetic relatedness as a function <strong>of</strong> distance in<br />
the Pacific golden chanterelle (Cantharellus formosus) within a 50 ha forest stand.<br />
Significant fine-scale genetic structure was detected with genetic ‘patches’ approximating<br />
400 m in diameter indicating spore dispersal limitations for this<br />
species. These results have important implications for population sampling and<br />
fungal ecology. contributed presentation<br />
Eberhart, Joyce L. 1 *, Luoma Dan L. 1 , Abbott, Rick 2 and Moore, Andy 2 . 1 Department<br />
<strong>of</strong> Forest Science, Oregon State University, Corvallis, OR 97331, USA,<br />
2 Umpqua National Forest, Roseburg, OR 97470, USA. joyce.eberhart@orst.edu.<br />
Ten years <strong>of</strong> monitoring the effects <strong>of</strong> harvest techniques on <strong>America</strong>n matsutake<br />
(Tricholoma magnivelare) production.<br />
The commercial harvest <strong>of</strong> <strong>America</strong>n matsutake (Tricholoma magnivelarehas<br />
become a multi-million dollar industry in the Pacific Northwest. There is considerable<br />
controversy regarding how the resource should be managed, including<br />
concern over whether raking <strong>of</strong> surface soil layers to find mushrooms will reduce<br />
subsequent fruiting. The objective <strong>of</strong> this study is to evaluate the effects <strong>of</strong> several<br />
harvest techniques on matsutake production. In 1994 the study was established<br />
in the Oregon Cascades, selecting 18 similar shiros <strong>of</strong> matsutake. In 1995 six<br />
treatments were implemented: 1) No harvest (control), 2) Harvest with minimal<br />
disturbance (gentle rocking and pulling), 3) Raking litter and duff layers, sporocarp<br />
removal and NO replacement <strong>of</strong> the duff, 4) Raking litter and duff layers,<br />
sporocarp removal, and careful replacement <strong>of</strong> the duff, 5) Removal <strong>of</strong> the litter<br />
and duff layer and 10cm <strong>of</strong> mineral soil, sporocarp removal and NO replacement<br />
<strong>of</strong> duff and mineral soil, 6) Removal <strong>of</strong> the litter and duff layer and 10cm <strong>of</strong> mineral<br />
soil, sporocarp removal and replacement <strong>of</strong> duff and mineral soil. Mushroom<br />
production <strong>of</strong> the shiros has now been monitored for 10 years. Results indicate<br />
that careful harvest methods have no impact on sporocarp production, while raking<br />
without replacement <strong>of</strong> the duff has long-term negative impacts. Damage to<br />
shiros caused by repeated raking has not been tested. poster<br />
Edwards, Sally M.* and Spiegel, Frederick W. Department <strong>of</strong> Biological Sciences,<br />
SCEN 632, University <strong>of</strong> Arkansas, Fayetteville AR 72701, USA. smedwar@uark.edu.<br />
Branch patterns and formation in the dictyostelids.<br />
The dictyostelid cellular slime molds are notable for several unusual components<br />
<strong>of</strong> their life cycles. Members <strong>of</strong> this group typically exist in humus, soil,<br />
or dung as free-living amoebae. When their bacterial food sources become scarce,<br />
the amoebae aggregate in response to a chemical signal. These aggregations <strong>of</strong><br />
discrete cells, known as pseudoplasmodia, can form migratory slugs. Fruiting occurs<br />
once a suitable environment is reached; in many species, the anterior cells <strong>of</strong><br />
the slug form a non-living cellular stalk while the posterior cells develop into the<br />
sticky spore mass, or sorus. However, many dictyostelids produce fruiting bodies<br />
which display elaborate branching patterns and multiple sori. The most familiar<br />
<strong>of</strong> these patterns are the Christmas tree-like whorls <strong>of</strong> Polysphondylium. However,<br />
other types <strong>of</strong> branching do occur, as in the irregular fruiting bodies <strong>of</strong> Dictyostelium<br />
aureo-stipes and the coremiform formations <strong>of</strong> D. polycephalum. It has<br />
previously been difficult to illustrate the development <strong>of</strong> these more complex<br />
fruiting bodies due to limitations in photographic equipment. Using Auto-Montage<br />
with both a dissecting and compound microscope, in-focus photomicrographs<br />
were obtained for the successive stages <strong>of</strong> fruiting body formation. The<br />
taxonomic implications <strong>of</strong> developmental characteristics such as branching will<br />
also be discussed. poster<br />
Elmore, Whitney C.*, Kimbrough, James W. and Benny, Gerald. Mycology Lab,<br />
University <strong>of</strong> Florida, P.O. Box 110680, Gainesville, FL 32611, USA. wcelmore@ufl.edu.<br />
Arbuscular mycorrhizal fungal diversity and colonization <strong>of</strong><br />
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<strong>Inoculum</strong> <strong>56</strong>(4), November 2005 17