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Ploidy Level Variability of Some Central European Fescues (Festuca Subg

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Ploidy Level Variability of Some Central European Fescues (Festuca Subg Biologia, Bratislava, 60/1: 25—36, 2005 25 Ploidy level variability of some Central European fescues (Festuca subg. Festuca,Poaceae) Petr Šmarda1,JochenMüller2,JanVrána3,4 &KateřinaKočí1 1Department of Botany, Faculty of Science, Masaryk University, Kotlářská 2,CZ–611 37 Brno,CzechRepublic;fax:++ 420 5 4121 1214, e-mail: [email protected] 2Institut für spezielle Botanik, Friedrich-Schiller-Universität, Philosophenweg 16,D–07743 Jena, Germany; fax: ++ 49 3641 949262, e-mail: [email protected] 3Laboratory of Molecular Cytogenetics and Cytometry, Institute of Experimental Botany, Sokolovská 6,CZ–77200 Olomouc, Czech Republic 4Institute for Stem Cell Research, University of Edinburgh, West Mains Road, Edinburgh EH93JQ, United Kingdom Abstract: Using flow cytometry, ploidy levels for 205 living samples of various European species of Festuca L. subg. Festuca were determined. We used successfully flow cytometry also for ploidy level estimation of other 28 additional, 1/2–2-year-old herbarium specimens. About 23 taxa and two spontaneous hybrids originating from natural populations from Austria, the Czech Republic, France, Hungary, Germany, Italy, Poland, Romania and Slovakia were studied. The following ploidy levels were documented: F. alpestris 2n =2x; F. amethystina 2n =4x; F. billyi 2n =6x; F. brevipila 2n =6x; F. carnuntina 2n =6x; F. cinerea 2n =4x; F. degenii 2n =4x; F. duernsteinensis 2n =4x; F. duvalii 2n =4x; F. gracilior 2n =2x; F. lemanii 2n =6x; F. ovina subsp. guestfalica 2n =4x;cf.F. ovina × F. pallens 2n =2x; F. pallens 2n =2x,3x,4x; F. psammophila 2n =2x; F. pseudodalmatica 2n =4x; F. pseudovina 2n =2x; F. rupicola 2n =6x; F. stricta 2n =6x; F. vaginata subsp. dominii 2n =2x; F. vaginata subsp. vaginata 2n =2x; F. vaginata × F. valesiaca 2n =2x; F. valesiaca 2n =2x; F. versicolor subsp. versicolor 2n =2x; F. wagneri 2n =4x. Key words: dry material, flow cytometry, karyology, polyploidy. Introduction level became one of the basic classification and descrip- tion criteria. Without knowledge of ploidy level, almost Including about 360 species (Watson & Dallwitz, no systematic and taxonomic study can be done in this 1999), Festuca L. is one of the largest genera within group at present. the Poaceae family. Clayton & Renvoize (1986) di- This raises the question of what method to use vided the genus into the nine subgenera, with the most for ploidy level determination. The widely used aceto- species-rich group being Festuca subg. Festuca.One orcein method and similar techniques are very time- center of diversity of this subgenus is located in the consuming and do not allow determination of a large mountains and uplands of central and southern Eu- amount of samples. Recently, flow cytometry has be- rope. Within the subgenus, two sections, sect. Festuca come the method of choice for rapid and accurate de- and sect. Variae Hack., are recognized by Tzvelev termination of ploidy level and DNA content in fresh (1971). Further division in smaller species groups and plant tissues (Doležel, 1997). In Festuca,flowcytom- aggregates vary in the concepts of different authors. etry was first used by Huff & Palazzo (1998) and In subgen. Festuca, there is a remarkable morpho- Arumuganathan et al. (1999) and was successfully logical similarity among the taxa included, caused to applied in Festuca sect. Variae by Wallossek (1999). a great extent by the morphological variability of par- The base chromosome number of Festuca species is ticular characters. Based on morphological characters x = 7, diploids (2x) possess 14 chromosomes, triploids alone, interpretation of many taxa is very problematic (3x) 21, tetraploids (4x) 28 and hexaploids (6x)42 and sometimes nearly impossible. As already proved chromosomes; sometimes accessory chromosomes (B- in the 1920s, ploidy level variability is very important chromosomes) have also been reported (Mizianty & for taxon delimitation (Litardiere,` 1923; Lewitsky Pawlus, 1984; Fuente et al., 2001; Šmarda & Kočí, & Kuzmina, 1927). Soon it was shown that the most 2003). problematic species groups of the genus represent more The aim of this work was to determine the ploidy or less miscellaneous polyploid complexes, and ploidy levels of Central European species of Festuca subg. Fes- 26 P. Šmarda et al. tuca and some of their Mediterranean relatives; spe- miscellaneous taxa in sect. Festuca cial attention was devoted to species from the F. pal- F. amethystina L. lens group and to the possibility of using of flow cy- tometry in herbarium specimens. The results of this -sect. Variae Hack. study build upon previous records on chromosome num- F. alpestris Roem. et Schult. bers obtained by the aceto-orcein method (Šmarda & F. versicolor Tausch subsp. versicolor Kočí, 2003). In this work, we follow the concept of Central Euro- pean species and groups by Tracey (1980), which cor- Material and methods responds to the subsection divisions of Pawlus (1985). For determination of ploidy level, flow cytometry was For taxa delimitation, we adopt the species concepts of used. Measurements proceeded in 2000 with a PAS (Partec Markgraf-Dannenberg (1980) and Portal (1999). GmbH, Münster, Germany) ploidy analyser. We used both This work addresses the following European taxa and living and dried plant specimens. Living material came from groups: field-collections, and was cultivated after collection (1997 -sect. Festuca or later) in the Botanical Garden of Masaryk University in F. ovina Festuca Brno, Czech Republic. One to three (seven at maximum) group (ser. ): individuals from each population were investigated. Alto- × Vetter F. duernsteinensis J. * gether 205 living plants representing 142 populations of 21 F. ovina subsp. guestfalica (Boenn. ex Rchb.) K. taxa and two spontaneous hybrids were studied. Addition- Richt. ally, 31 dried, 1/2–2-year-old plant specimens from authors’ F. lemanii Bastard herbaria collections, representing 27 populations of 4 taxa, were investigated. These specimens were dried by classical F. pallens group (ser. Psammophilae Pawlus): methods, e.g. pressed among sheets of newspapers and fil- F. billyi Kerguélen et Plonka tering paper at room temperature. In addition to these, one 20-year-old and three 6–7-year-old specimens of F. brevip- F. cinerea Vill. St.-Yves) Markgr.-Dann ila stored in the Moravian Museum in Brno (BRNM) were F. degenii ( . used. Specimens of all determined living plants and authors’ F. duvalii (St.-Yves) Markgr.-Dann. collections are stored at the Herbarium of the Department F. gracilior (Hack.) Markgr.-Dann. of Botany, Faculty of Science, Masaryk University in Brno F. pallens Host** (BRNU). The localities of plants of which ploidy levels were – Oberösterreich-Niederösterreich type (Tracey determined are given in the appendix. 1980, Pils 1981) Young, basal parts of leaves were used for analysis – Weizklamm type (Tracey 1980) of both fresh and dried plant material. Fresh diploid F. n – Pannonisches-Hügelland type (Tracey 1980) pallens (2 = 14, sample F2, ŠMARDA &KOČÍ 2003) served as external standard. A two-step procedure (OTTO, – scabrifolia type (Šmarda & Kočí 2003, F. glau- Stohr 1990) was used for sample preparation. Leaf tissue of ca cina ) 0.5 cm2 was chopped using a sharp razor blade in a glass Tracey – Steiermark-Kärnten type (sensu 1980) Petri dish containing 0.5 mL Otto I buffer (0.1M citric F. psammophila (Hack. ex Čelak.) Fritsch acid, 0.5% Tween 20). The crude nuclei suspension was fil- F. vaginata Waldst.etKit.exWilld. subsp. vagi- tered through a 50 µm nylon mesh. 1 mL of Otto II buffer nata (0.4M Na2HPO4.12H2O) supplemented with 2 µg/mL 4,6- subsp. dominii (Krajina) Soó diamidino-2-phenylindole (DAPI) was then added to the nuclei suspension. For verification of the results, ploidy F. valesiaca group (ser. Trachyphyllae PAW L U S level was also tested by flow cytometry for several samples with known chromosome numbers (ŠMARDA &KOČÍ, 2003). +ser.Valesiacae PAW L U S ): R. Tracey They are marked by asterisks in the appendix. F. brevipila Coordinates of the localities in Austria, Germany and F. carnuntina R. Tracey Slovakia were calculated from 1:50 000 maps, those of Czech F. pseudodalmatica Krajina ex Domin Republic were obtained through the program Geobáze F. pseudovina Hack.exWiesb. (GEODÉZIE ČS, 1997–1998). For the remaining (France, F. rupicola Heuff. Hungary, Italy, Poland, and Romania) the program Encarta F. stricta Host World atlas 99 (MICROSOFT CORPORATION, 1995–1998) F. valesiaca Gaudin was used. F. wagneri (Degen, Thaisz et Flatt) Degen, Thaisz et Flatt Results and discussion Festuca ovina group * tetraploid taxa of the supposed F. ovina × F. pallens In the F. ovina group, special attention was paid to var- hybrid origin, incl. population of the same hybrid combina- tion from Vihorlat Mts (F. × vihorlatica MÁJOVSKÝ nom. ious transitional types to F. pallens. Tetraploid ploidy inval.), excl. sporadic diploid hybrids. level was confirmed for the population of robust F. ovi- ** taxon with several karyologically and geographically na like plants from Moravský Krumlov (SW Moravia), differentiated types with unresolved taxonomic status. supposed to represent hybrids of F. ovina and F. pallens Ploidy level variability... 27 Fig. 1. Map of the localities of plants from the Festuca ovina group, F. amethystina, hybrids and Festuca sect. Variae for which ploidy level was investigated: white circle – F. alpestris (2n =2x); dark cir- cles – F. versicolor (2n =2x); checked circles – F. lemanii (2n =6x); dark tri- angles –F.ovina× F. pallens (2n =2x); white triangle – F. vaginata × ? F. vale- siaca –(2n =2x); white diamonds – F. amethystina (2n =4x); dark diamond – F. ovina subsp. guestfalica (2n =4x); white squares – F.“×”duernsteinensis (2n =4x). Altogether 30 ploidy level records are shown. and sometimes being assigned to F. × duernsteinen- Festuca pallens group sis (Vetter, 1922; Šmarda & Kočí, 2003). A fur- In F. pallens, the supposed geographical dependence ther transitional population of assumed F. ovina × F. of both ploidy levels and currently distinguished types pallens origin from the Vihorlat Mts (called F. × vi- (Fig.
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