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Ploidy Levels and Evolution in Boletales* ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Sydowia Beihefte Jahr/Year: 1995 Band/Volume: 10 Autor(en)/Author(s): Bresinsky Andreas, Wittmann-Bresinsky B. Artikel/Article: Ploidy levels and evolution in Boletales 35-47 ©Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.zobodat.at Ploidy levels and evolution in Boletales* A. Bresinsky & B. Wittmann-Bresinsky Institut für Botanik der Universität, D-93040 Regensburg, Germany Bresinsky, A. & B. Wittmann-Bresinsky (1995). Ploidy levels and evolution in Boletales. - Beih. Sydowia X: 35-47. Cytofluorometric analyses of nuclear DNA contents have been carried out with species of Boletales which have never or only little been studied in this respect. Differences being whole multiples of a basic value are interpreted as different ploidy levels. Thirty-eight species originating from Europe, North America, and from Malaysia have been studied. The data are discussed in relation to data from 123 additional species previously examined, and they are set in a general evolutionary context. Keywords: cytofluorometry, DNA, ploidy, evolution, Boletales. Polyploidy in higher plants is closely related to evolution. Obtaining knowledge about polyploidy and its possible role in evolution of fungi is hampered by the fact that fungal chromosomes are very small and are not readily seen during mitosis and meiosis. Fungal ploidy levels can rarely be analyzed successfully by counting chromosomes. In addition, such analysis requires complicated methods. Therefore fungal chromosome numbers are known with certainty in only a few cases. An indirect method to obtain ploidy levels is to analyse the nuclear DNA content after DAPI (4’,6-diamino-2-phenylindole) staining and evaluate the data of different species comparatively (Bresinsky & al., 1987a; 1987b). This method has its limits (Wittmann- Meixner & al., 1989b; Arnold, 1993) and the results allow inference of ploidy level only if the analyzed taxa (or their nuclear DNA-values) are comparable in the following aspects: (1) Base composition (GC-contents), because DAPI binds to AT- rich segments of DNA; (2) the percentage of repetitive DNA; (3) the percentage of insertions and deletions in the DNA; (4) the current phase of the cell cycle; (5) permeability to DAPI; (6) optical characteristics of the cell structures; the background should show little fluorescence. * This paper is dedicated to Professor M. Moser on the occasion of his seventieth birthday. 35 ©Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.zobodat.at Within a surveyable range of taxonomic relationships of fungi these conditions seem to be fulfilled. GC-content and amount of repetitive DNA usually show little variation within genera and families of fungi (for references see Wittmann-Meixner, 1989). Variation of DNA content due to phase of cell cycle can be kept under control by observation of comparable stages. The measured DNA contents provide reliable, reproducible and constant taxonomic characters of fungal species. Small differences in the measured nuclear DNA contents (within the extent of standard deviation) of two compared samples do not necessarily mean different number of chromosomes and may be dependent on the above mentioned parameters or to inaccuracy of measurement. However, large differences in the nuclear DNA contents expressed as multiples of a basic value are to be interpreted as different ploidy levels. Previous analyses of Boletales (Meixner & Bresinsky, 1988; Wittmann-Meixner & Bresinsky, 1989a; Wittmann-Meixner, 1989), Ascomycetes (Weber, 1992), and the subgenus Telamonia within Cortinarius (Arnold, 1993) indicated the DNA-values of different species within closely related groups (e.g. genera) frequently represent whole multiples of a basic value. Taxa shown to be polyploid by this method mostly live under the same environmental conditions as is known for higher plants. As in higher plants, polyploidy may indicate previously unknown differentiation into several species or infraspecific taxa (Weber, 1992; Arnold, 1993). This study relates to Boletales s.l., as indicated by chemical and molecular biological characteristics (Bresinsky & Besl, 1979; Bruns & al., 1989) and includes members of following families: Coniophoraceae, Paxillaceae, Omphalotaceae, Boletaceae, Strobilo- mycetaceae, Gomphidiaceae, Rhizopogonaceae and further gastroid families. Previous studies (Wittmann-Meixner, 1989) could not demon­ strate heteroploidy (infraspecific polyploidy) in Boletales (278 strains for a totale of 128 investigated species). Nuclear DNA contents remained constant within one single species. This holds true within several strains of Paxillus involutus originating from different hosts and therefore probably belonging to separate, incompatible groups (Fries, 1985): identical nuclear DNA values were observed in spite of beginning speciation. One sample of P. involutus from Chile, probably imported from Europe, was significantly different from European strains, although the difference was smaller than a whole ploidy level. On the other hand, speciation could be correlated with differences in nuclear DNA contents in Boletus edulis s.l. and Leccinum scaber s.l. All ploidy levels from lx to lOx were found in Boletales; mostly they were even-numbered levels (2x, 4x, 6x). Up to four different levels were determined within one genus. Closely related pairs of species 36 ©Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.zobodat.at were compared: species occurring in glacially disturbed areas, as well as species with advanced characters in general belonged to a higher ploidy level (e.g. Suillus sibiricus versus S. americanus ; Paxillus panuoides versus P. curtisii). In areas with great glacial disturbance the percentage of polyploid species was high; in refuge areas (e.g. the deciduous forest belt of North America) monoploid species were more common. The goal of the present study is to analyse additional species of Boletales s.l. from Central Europe and North America and some species from the tropical regions of Malaysia. Tropical species of Boletales have not yet been analysed. Thirteen Malayan species could be examined that had been collected during an excursion of the University of Regensburg. Such a small number of species is of course not representative of the total tropical diversity, yet it was of interest to determine, even if only approximately, the ratio of polyploid species within tropical Boletales because this portion is known to be often quite large in higher plants due to paleopolyploidy. Six Californian species were also examined. All but one had never been studied cytologically. The material from Europe contained some rare species not yet analysed; also included are subspecies that belong to taxa apparently in continuous evolutionary progress and species that have been studied in North American samples only (e.g. Tylopilus felleus). Material and methods Material examined. Austroboletus dictyotus (Bredijn) Wolfe: MALAYSIA, Pulan Penang, Muka Head Field Station, 8. 4. 1991, leg. N. Arnold & H. Besl, det. H. Besl. - Boletellus emodensis (Berk.) Sing.: MALAYSIA, Cameron Highlands, Gunung Berembang, 25. 4. 1991, leg. N. Arnold & H. Besl, det. H. Besl. - Boletellus dissiliens (Corner) Pegler et Young: MALAYSIA, Pulan Penang, Forest Reserve near Telok Bahang, 9. 4. 1991, leg. N. Arnold & H. Besl, det. H. Besl. Boletus aereus Bull.: Fr.: GERMANY, Karlstadt near Wurzburg, 18. 10. 1989, leg. & det. W Steglich & A. Reisinger. Boletus appendiculatus Schaeff.: ROMANIA, frozen material obtained from mushroom seller, 1989. -Boletus aureomycelinus Pat. & Bak.: MALAYSIA, Pulan Penang, Muka Head Field Station, 8. 4. 1991, leg. N. Arnold & H. Besl, det. H. Besl. Boletus craspedius Mass.: MALAYSIA, Pulan Penang, Muka Head Field Station, 8. 4. 1991, leg. N. Arnold & H. Besl, det. H. Besl. - Boletus depilatus Redeuilh: GERMANY, Herrsching, Ammersee, Sept. 1989, mushroom foray. Boletus edulis Bull.: Fr. var. quercicola Vasilk.: UKRAINIA, Kiev region, 17.8.1989, leg. & det. S.P Wasser & A. Bresinsky. Boletus- edulis Bull.: Fr. var. betulicola Vasilk.: UKRAINIA, Kiev region, 15. 7. 1989, leg. & det. S. P Wasser & A. Bresinsky. Boletus graveolens Corner: MALAYSIA, Pulan Penang, Penang Hill, 19. 4. 1991, leg. N. Arnold & H. Besl, det. H. Besl.Boletus - gyrodontoides Corner: MALAYSIA, Pulan Penang, Muka Head Field Station, 8. 4. 1991, leg. N. Arnold & H. Besl. -Boletus rhodopurpureus Smotl.: GERMANY, Kaltenbrunn, Garmisch, 10. 10. 1991, leg. M. Beisenherz, det. A. Bresinsky (ss. 37 ©Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.zobodat.at Bresinsky & al., 1982, cf. Boletus satanoides). Boletus sylvestris Petsch: MALAYSIA, Pulan Penang, Muka Head Field Station, 8. 4. 1991, leg. N. Arnold & H. Besl, det. H. Besl. - Boletus tristiculus Mass.: MALAYSIA, Pulan Penang, Muka head Field Station, 8. 4. 1991, leg. N. Arnold & H. Besl, det. H. Besl. -Chamonixia caespitosa Roll.: GERMANY, Oberpfalz, Elm near Kaimling (MTB 6339/4), 28. 9. 1991, leg. & det. H. Zitzmann. -Chroogomphus helveticus (Sing.) Mos. ssp. tatrensis (Pil.) Kuthan & Sing.: No. 119, GERMANY, Wettersteingebirge, Garmisch, Schachen, 15. 8. 1989, leg. & det. A. Bresinsky. - No 118, GERMANY, Pillnach, 4. 10. 1991, leg. & det. M. Kronfeldner. -Chroogomphus vinicolor (Peck) O. K. Miller: USA, California, Pt. Reyes, 15. 3. 1991, leg. M. Fischer,
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