Book of Abstracts (PDF) - International Mycological Association

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IMC7 Main Congress Theme IV: POPULATION DYNAMICS AND ECOLOGY Posters (AZ24-AZ709; AZ107-AZ709) were designed for the PCR amplification of fungal 28S rDNA (covering D1, D2 and D3 regions) from marine fungi and environmental algal samples. Two other pairs for 18S (NS1-FR1; FF390-FR1) were chosen from previously published work for their fungal specificity and their ability to achieve a separation for most of the amplification products obtained from a reference collection. The remaining primer pair (FF390- NS24) was fungal specific for the 3-prime end of the 18S rRNA gene. 322 Book of Abstracts
IMC7 Main Congress Theme V: CELL BIOLOGY AND PHYSIOLOGY Posters 1066 - Exploring the transcriptome of the nematodetrapping fungus Monacrosporium haptotylum D.G. Ahrén, C. Fekete * , E. Friman, T. Johansson & A. Tunlid Department of Microbial Ecology, Ecology Building, SE 223 62 Lund, Sweden. - E-mail: csaba.fekete@mbioekol.lu.se Monacrosporium haptotylum infects nematodes using adhesive knobs, which are developed on branches of vegetative mycelium. To identify genes and metabolic pathways that are expressed during development of traps and infection of nematodes, we have analyzed 4767 expressed sequence tags from three different cDNA libraries, vegetative mycelium, knobs, and knobs infecting the nematode Caenorhabditis elegans. The ESTs were clustered into 2006 contigs representing 2006 putatively unique transcripts. Only 7.6% of the contigs contained ESTs from more than one cDNA library, thus the patterns of genes expressed in the three libraries were significantly different. Approximately 26-37% of all ESTs displayed significant similarities to sequences found in the GenBank database. Most markedly, the frequency of transcripts related to protein synthesis was up-regulated in the knobs. On the other hand the knob library contained in comparison with the mycelium cells and the fungus infected the nematode lower frequencies of ESTs involved in cell growth, cell division and DNA synthesis, transcription, protein destination and cellular communication/ signal transduction. Among the most prevalent transcripts expressed during the infection of nematodes were ESTs displaying sequence similarities to extracellular proteases, transportes and toxins. 1067 - Identification of an HMG-domain protein implicated in nuclear migration and mating in Coprinus cinereus M.C. Aime * & L.A. Casselton University of Oxford, Department of Plant Sciences, South Parks Road, Oxford OX1 3RB, U.K. - E-mail: cathie.aime@plants.ox.ac.uk Mating between compatible homokaryons in Coprinus cinereus leads to the formation of a mycelium known as a dikaryon. In the dikaryon nuclei of both mates remain paired in each cell and are partitioned each time the cell divides via a structure known as the clamp connection. The formation and maintenance of the dikaryon is under the control of two sets of genes, the A mating type genes that encode a transcription factor that activates clamp cell formation and the B mating type genes that encode peptide pheromones and their cognate receptors, and which activate nuclear migration following compatible cell fusion and clamp cell fusion once the dikaryon is established. We are trying to understand how pheromone signalling regulates these quite distinct stages in dikaryon development. As a first step towards our goal we cloned a gene, hmg1, which encodes a High Mobility Group (HMG) protein. Homologous replacement of hmg1 implicates HMG1 in nuclear migration, but not in clamp cell fusion. ∆hmg1 strains are capable of donating nuclei to a wild type partner, but unable to receive nuclei. Homozygous ∆hmg1 dikaryons display unusually vigorous growth, but nuclear distribution is irregular and sporulation is defective. Current studies explore the role of Hmg1 in pheromone signalling and the role it may have in regulating nuclear migration at other stages in sexual development. 1068 - Heterologous diploid nuclei in the violet root rot fungus, Helicobasidium mompa * T. Aimi , Y. Iwasaki, S. Kano, Y. Yotsutani & T. Morinaga School of Bioresources,Hiroshima Prefectural University, Nanatsuka 562,Shobara-city,Hiroshima Prefecture 727- 0023, Japan. - E-mail: taimi@bio.hiroshima-pu.ac.jp Allelic genes hga1-1 and hga1-2, which encode G protein alpha subunit from violet root rot fungus, Helicobasidium mompa, were sequenced and characterized. Restriction fragment polymorphism (RFLP) analysis determined that the gene is present as a single locus in the single basidiospore isolates, while strain V169 possessed both alleles of this gene. Therefore, although basidiospore isolates are dikaryon, they are homokaryon. Field-isolated strain V169, the putative parent strain, is dikaryotic heterokaryon. hga1-1 and hga1-2 segregated to almost 1:3 among single basidiospore isolates from the same fruiting body. These results suggest that one of the nuclei in the V169 parent strain is homologous diploid and the other heterologous diploid. This parent strain produced four homokaryotic and dikaryotic basidiospores on each basidium. The basidiospore germinated to homokaryotic and dikaryotic mycelium, and the homokaryon strains generated secondary mycelium by mating between compatible homokaryon. 1069 - Water relations, photosynthesis and growth of mycorrhizal bean plants under water stress 1* 2 3 M.R. Amerian , W.S Stewart & H. Griffiths 1 Shahrood University, 7th Tir Square, Shahrood, Iran. - 2 Agricultural and Environmental Sciences Dept., Newcastle University, Newcastle upon Tyne, U.K. - 3 Department of Plant Sciences, Cambridge University, Cambridge, U.K. - E-mail: M.R.Amerian@ncl.ac.uk Arbuscular mycorrhizae symbiosis often altered water relations with consequent effects on gas exchange rate and photosynthesis. The effect of arbuscular mycorrhizal (AM) colonisation on photosynthesis, stomatal conductance, water relations, leaf area and dry weight of droughted and well-watered Phaseolus vulgaris L. was assessed after 3 Book of Abstracts 323
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IMC7 Book of Abstracts The 7th Inte
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Page 367 and 368: Cavernularia: 356 Cenococcum: 500,
Page 369 and 370: Hyalorbilia: 479 Hyalorhinocladiell
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Verrucaria: 616 Verruculina: 963 Ve
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Order Index Agaricales: 40, 50, 51,
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Bogomolova, E.V.: 1078 Bohar, Gy.:
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Forlani, G.: 565 Forsby, A.: 842, 8
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Juuti, J.T.: 701, 1126 Kabrick, J.M
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Morocko, I.: 859 Moser, J.C.: 426,
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Sattayaphisut, W.: 1171 Saunders, E
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Vukojevic, J.: 363 Vurro, M.: 116 V
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