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Genetic Differences Among the Four Stipa Species Endangered and Protected in Poland

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Genetic Differences Among the Four Stipa Species Endangered and Protected in Poland Biodiv. Res. Conserv. 1-2: 45-49, 2006 BRC www.brc.amu.edu.pl Genetic differences among the four Stipa species endangered and protected in Poland Maria Krzakowa*, Marcin Michalak & Maria Judek Department of Genetics, Adam Mickiewicz University, Umultowska 89, 61-614 PoznaÒ, Poland, *e-mail: [email protected] Abstract: The distinct character of four species of Stipa genus, S. borysthenica, S. capillata, S. joannis and S. pulcherrima was manifested in the variability of three enzyme systems, including glutamate-oxalacetate transaminase (GOT), esterase (EST) and peroxidase (PX). The studies were conducted on two-month-old seedlings cultured under the same glasshouse conditions, obtained from seeds from the Botanical Gardens collection. Fifteen loci were described, of which eight proved to be polymorphic. The studies included also the complex species of S. pennata and the closely related species of S. tirsa. Key words: Stipa borysthenica, S. capillata, S. joannis, S. pulcherrima, S. pennata, S. tirsa, enzyme, electrophoresis 1. Introduction stands along the lower Odra River and in Wielkopolska (Ceynowa-Gie≥don 2001a). S. capillata is a species typical In Poland occur four species of the Stipa genus, for the Potentillo-Stipetum capillatae community. It including S. borysthenica Klokov, S. capillata L., S. grows in small populations along Lower Odra River, in joannis »elak and S. pulcherrima K. Koch. All belong northwestern Poland, in the ToruÒ-Eberswalde proglacial to the group of grasses covered by strict protection and, streat valley, in Nida Lowland, Ma≥opolska and Lubelska being endangered, they are included in the Polish Red Highlands (Filipek 1974; GÛrska-Zajπczkowska & Book of Plants (Kaümierczakowa & Zarzycki 2001). WÍglarski 1993; PiÍkoú-Mirkowa & Mirek 2002; Populations of Stipa species in Poland have a low Towpasz & Mitka 2001). Individual stands of S. joannis frequency due to human activity as they were used them can be encountered mainly along the lower Vistula River, for decoration due to the exceptionally aesthetic habit in the Notecka proglacial stream valley, in Warta valley, of their panicles (Koz≥owski 2002). For this reason, the and along the lower Odra River (GÛrska-Zajπczkowska species in some regions are endangered by extinction et al. 1989; Michalik 1991; Majtkowska & Majtkowski (Øukowski & Jackowiak 1995). Occurrence of the 2004). In the north of Poland the species forms the species is linked to xerothermic grasses of a steppe type Potentillo-Stipetum community. S. pulcherrima is a very in the Festuco-Brometea class. These may change their rare species in Poland, endangered by extinction. Along character both in a natural way and due to spontaneous the lower Odra River it composes the Linosyridi- succession of bushes and trees which leads to shadowing Stipetum pulcherrimae complex. It is thought to and disappearance of heliophilic species (including represent a typical species of xerothermic grasses of those of Stipa genus). It may also be due to human activity the Festucetalia-valesiaceae order, together with S. in the form of excessive pasturage or effects of eutrophic joannis (Matuszkiewicz 2001). It occupies a few stands waters flowing down from the neighbouring fields under by the Odra River and on the Sandomierska Highland cultivation (this pertains particularly S. joannis).The (Ceynowa-Gie≥don 2001b). increasingly rare biotopes of Stipa genus species are The progression of the degradation of biotopes in protected in preserves which play the role of living gene recent years, constrains botanists to undertake additional banks. The most frequently protected are species of S. measures to preserve the gene pool of endangered capillata and S. joannis (PiÍkoú-Mirkowa & Mirek 2002). species using ex situ culture in botanical gardens. Taking S. borysthenica grows in Poland very infrequently. into account that inter-specific differences, according The species is known to occupy only five xerothermic to biochemical character, were not investigated earlier VARIABILITY, AND VARIABILITY, TAXONOMY PHYLOGENY © Adam Mickiewicz University in PoznaÒ (Poland), Department of Plant Taxonomy. All rights reserved. 46 Maria Krzakowa et al. Genetic differences among the four Stipa species endangered... in the genus Stipa, we have decided to take advantage collection of our own, from the Barbarka population of such collections for this preliminary study. near ToruÒ and Skorocice population near Busko; Botanical Garden, Institute of Plant Culture and 2. Material and methods Acclimation in Bydgoszcz: the seeds originated from Chorπgiewki population; The species were represented by the following S. pennata ñ 2 samples: Botanical Garden, University samples of seeds: of Warsaw; Botanical Garden, Adam Mickiewicz S. borysthenica ñ 2 samples: Botanical Garden, University: the seeds originated from Frankfurt am Adam Mickiewicz University; the seeds originated from Main; exchange with Botanical Garden in Budapest; S. pulcherrima ñ 2 samples: Botanical Garden, S. capillata ñ 10 samples: Botanical Garden, Adam Institute of Plant Culture in Bydgoszcz ñ the plants were Mickiewicz University ñ the seeds originated from developed from seeds obtained by exchange with the populations in the vicinity of WÍgrzyce near GorzÛw, Botanical Garden in Berlin-Dahlem; Botanical Garden, from the Ojcowski National Park and St. Laurentís Adam Mickiewicz University: seeds of plants originating Mountain, and from the Botanical Garden, Frankfurt from Ukraine; am Main; Botanical Garden, University of £Ûdü; S. tirsa ñ 2 samples: Botanical Garden, Adam Botanical Garden, University of Marie Sk≥odowska- Mickiewicz University: the seeds originated from Curie in Lublin ñ the seeds originated from natural exchange with the Botanical Garden in Berlin and our populations in Wiúlica and from an exchange program; own collection. Botanical Garden, University of Warsaw; Botanical Seedlings originating from Botanical Gardens seed Garden, Jagiellonian University in Cracow; collections were cultivated in identical glasshouse S. joannis ñ 4 samples: Botanical Garden, Adam conditions. A crude extract of individual plants was Mickiewicz University ñ the seeds originated from subjected to electrophoresis in 11% starch gel in EST Stipa pennata Stipa pulcherrima Stipa capillata Stipa joannis Stipa borysthenica Stipa tirsa 57 54 51 48 46 37 26 25 15 10 GOT Stipa pennata Stipa pulcherrima Stipa capillata Stipa joannis Stipa borysthenica Stipa tirsa 51 49 46 44 38 35 25 20 Px -4 -6 -10 -15 -20 -25 -27 Stipa pennata Stipa pulcherrima Stipa capillata Stipa joannis Stipa borysthenica Stipa tirsa Fig. 1. Schematic diagrams of electrophoretically detected allozymes for the examined 6 species Biodiv. Res. Conserv. 1-2: 45-49, 2006 47 lithiumborate buffer system, pH 8.3. The gels were documented by separate, single-banded loci as well as stained specifically (Show-Prasad 1970) for three for M and N (showing no hybrid bands). enzymes: glutamate-oxalacetic transaminase (GOT, EST. The band pattern pointed to the monomeric EC.2.6.1.1), esterase (EST, EC 3.1.1.2), peroxidase (PX, character of the enzyme. The five distinguished loci EC 1.11.1.7). Interspecific differences were illustrated well characterized the species.The most polymorphic by Sphi coefficient (Leuschner 1974), principal proved to be the E locus with four alleles. At this locus component analysis and aglomerative clustering using the species demonstrated fixation of the heterozygous the unweighted-pair-group method (UPMGA). In this condition, frequently termed ìthe fixed heterozygosityî way, six species were compared, using the nomenclature which, nevertheless, was typical for the species. Thus, of the Botanical Gardens from which the seeds came. four species (S. pulcherrima, S. capillata, S. joannis and S. borysthenica) demonstrated E1E2 phenotype, S. 3. Results and discussion tirsa showed E2E3 phenotype while S. pennata demonstrated E3E4 phenotype or differed from each For each enzyme system, band patterns on the gels other even if, as closely related, they shared the common permitted the establishment of separate loci and their E3 allele. It should be recalled that S. pennata as allozymes (Fig. 1). a morphologically variable species served as a common GOT. Assuming that, similarly to other plants, the species for a few other species the taxonomic identity glutamate-oxalacetic transaminase is a dimer (Hillis & of which underwent periodic modifications. Material Moritz 1990), the two-banded phenotypes reflect for our studies originated from botanical garden expression in two separate loci. Each of bands collections, included small numbers of seeds and, containing two allozymes (in cases of H and I loci) are therefore, monomorphism of the samples. Even if they Fig. 2. Scatter diagram for the species investigated on the plane of the first two axes of the Principal Components. 1 ñ S. pennata, 2 ñ S. pulcherima, 3 ñ S. capillata, 4 ñ S. joannis, 5 ñ S. borysthenica, 6 ñ S. tirsa 48 Maria Krzakowa et al. Genetic differences among the four Stipa species endangered... are heterozygotic, they might occasionally result from groups of species: the first including S. pennata and S. their original form, a single plant. Ambiguities of the tirsa with S. borysthenica attached to them and the other type may be resolved only by appropriate population formed by S. pulcherrima and S. joannis, while S. studies. capillata proved its separate character. Persistence of ìfixed heterozygosityî might reflect In all the schemes a noticeable tendency
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