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Sorbus ×Latifolia Sl (Rosaceae) in the Balkan Peninsula and SW Asia

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Sorbus ×Latifolia Sl (Rosaceae) in the Balkan Peninsula and SW Asia PHYTOLOGIA BALCANICA 19 (1): 39 – 46, Sofia, 2013 39 Sorbus ×latifolia s.l. (Rosaceae) in the Balkan Peninsula and SW Asia Jerzy Zieliński1 & Vladimir Vladimirov2 1 University of Life Sciences, Faculty of Forestry, Wojska Polskiego 28, 60-637 Poznań, Poland, e-mail: [email protected] (corresponding author) 2 Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Acad. Georgi Bonchev St., bl. 23, 1113 Sofia, Bulgaria Received: January 17, 2013 ▷ Accepted: February 25, 2013 Abstract. New localities of Sorbus ×latifolia changing significantly the picture of its distribution range have been recorded in Bulgaria, Serbia and Turkey and presented on a map. Problems concerning the origin, variability and range of this controversial nothospecies are discussed. Data about its occurrence in SW Asia are published for the first time. Key words: Bulgaria, hybridization, nothospecies, Serbia, Sorbus aria s.l., Sorbus ×latifolia, Sorbus torminalis, taxonomy, Turkey, unidirectional introgression Introduction Kovanda 1996; Bernátová & Májovský 2003; Mikoláš 2004; Meyer & al. 2005; Rich & Houston 2006; Németh Hybridization is a frequent phenomenon among plants, 2007; Rich & Proctor 2009; Velebil 2012). Generally, de- but it is usually very difficult to classify the groups with- limitation of these taxa is very difficult or practically im- in which the species cross intensively. This relates to the possible, so they are often recognized as S. latifolia agg., genus Sorbus L. in Europe, which is represented on this S. latifolia group, or S. latifolia sensu lato (Aas & al. 1994; continent by several sexual species and numerous taxa Rudow & Aas 1997; Aldasoro & al. 1998). originating from hybridization. Hybrids between S. The problem of origin and relationship of young torminalis (L.) Crantz and S. aria sensu lato [incl. S. um- European Sorbus microspecies is becoming increas- bellata (Desf.) Fritsch and S. graeca (Spach) Schauer] are ingly an object of morphological and molecular stud- particularly common and are widespread from the Iberi- ies (Aas & al. 1994; Rudow & Aas 1997; Aldasoro & al. an Peninsula and Great Britain in the west, across France, 1998; Nelson-Jones & al. 2002; Chester & al. 2007; Rob- Switzerland, Austria, Germany, Czech Republic, and Slo- ertson & al. 2010). The obtained results and our obser- vakia, to Hungary, Romania and Crimea in the east. Pri- vations have prompted the following conclusions: 1. All mary hybrids, segregates and backcrosses form a mor- microspecies recognized within S. latifolia group origi- phologically diversified group of nothomorphs which nate from hybridization between S. aria s.l. and S. torm- for a long time has been treated under the oldest bino- inalis; thus, irrespective of ploidy level, their genotypes mial S. latifolia (Lam.) Pers. (Broad-leaf Whitebeam). contain the same gene set; 2. Morphological and genet- Among these hybrids, apomixis appeared to be common ic differences between hybrids result from their differ- (Jankun 1993) and since the second half of the last cen- ent chromosome number and different arrangement of tury more than 80 nothomorphs have been described as the same genes; 3. Hybridogenous taxa differ morpho- distinct species (e.g. Karpati 1960; Düll 1961; Sell 1989; logically from each other solely by quantitative, mostly 40 Zieliński, J. & Vladimirov, V. • New records of Sorbus ×latifolia overlapping features; 4. All morphotypes form a hybrid not been recorded earlier. The aim of the article is to swarm typical for polymorphic nothospecies. Taking update the information about the occurrence of S. ×lat- into consideration the above facts, it is difficult to jus- ifolia, because the new data change significantly the tify the need of distinguishing microspecies within S. present distribution map of this taxon. Herbarium ma- ×latifolia. This practice, formerly criticized by Gabrie- terial of Sorbus has been studied in the herbaria of the lian (1978), is also at variance with the recommenda- Institute of Biodiversity and Ecosystem Research, Sofia tions of the International Code of Botanical Nomencla- (SOM), St. Kliment Ohridski University of Sofia (SO), ture (McNeill & al. 2006: Appendix I, Art. H4). Agricultural University in Plovdiv (SOA), as well as at Our observations are in line with the conclusions of the Institute of Dendrology in Kórnik (KOR), Insti- Aas & al. (1994) that there is a continuous variation be- tute of Botany in Kraków (KRAM) and in the Herbar- tween hybrids and S. aria. All hybridogenous plants are ium Catalogue presented on-line by the Royal Botan- more or less intermediate between S. aria and S. torm- ic Garden Edinburgh [http://elmer.rbge.org.uk/bgbase/ inalis, but they are usually more similar to the former vherb/bgbasevherb.php; accessed 8 January 2013]. Liv- species. It is often difficult to insist if we are dealing with ing plants have been observed in the field in Bulgaria. a hybrid or with pure S. aria, so it could be assumed that there is unidirectional introgression between the Results and discussion above taxa towards S. aria. Its great morphological var- iability seems to result partly from this phenomenon. Hybridization, however, has probably no influence on Most new localities of S. ×latifolia are situated on the the S. torminalis gene pool; this species is always easy to territory of Bulgaria (Fig. 1), mainly in the following flo- distinguish from the hybridogenous specimens. ristic regions: Balkan Range, Znepole Region, Mt Sred- na Gora (Mt Lozenska), and Rhodopi Mts (Western and Aim and methods Central). The name “S. latifolia Pers.” was mentioned for the first time in the Bulgarian botanical literature by Stojanoff (1931), who reported that a herbarium spec- When revising herbarium material of Sorbus in the Bul- imen was collected by student G. Stamenoff near the garian herbaria, we discovered that S. ×latifolia grows village Treklyano in West Bulgaria. However, we were in the Balkan Peninsula and in the Asiatic part of Tur- unable to find this herbarium specimen in the Bulgar- key in northern Anatolia, in regions from which it has ian herbaria. Subsequently, information about the oc- Fig. 1. Distribution of Sor- bus ×latifolia in the Balkan Peninsula and SW Asia; • – herbarium specimens, – data from literature. Phytol. Balcan. 19(1) • Sofia • 2013 41 currence of hybrids between S. aria and S. torminalis in spinosa L. subsp. dasyphylla (Schur) Domin, Quercus this country was published by Vălev (1973) in Flora of petraea (Matt.) Liebl., Rosa canina L., and Sorbus grae- R Bulgaria (Znepole Region and Byala Reka in the Pi- ca. From the notes on the herbarium labels it appears rin Mts), although the latter record was not document- that in other places the hybrids grow in similar habitats: ed by a herbarium specimen. on sunny slopes, in deforested pastured summit areas In summer of 2012, we visited two of the Bulgar- of low mountains, along forest margins, in larger clear- ian localities of S. ×latifolia: the one around St. Pet- ings, along forest roads etc., and probably they do not ka Monastery near Asenovgrad and another one on occur above 1300–1400 m a.s.l. It can be inferred that peak Polovrak in Mt Lozenska, SE of Sofia. In the for- the present distribution range of S. ×latifolia in Bulgar- mer locality, the Broad-leaf Whitebeam was gathered ia comprises the following floristic regions (Fig. 1): Bal- in 1978 by Popova (SOA 35212, 35213) and Dimitrov kan Range (Central) (Fig. 3), Znepole Region, Pirin Mts (SOA 42624, 42625, 428630). Unfortunately, we did (Northern – only literature data; needs confirmation), not find it there. The slopes around St. Petka Monas- Mt Sredna Gora (Western) (Fig. 4) and Rhodopi Mts tery are presently covered by a dense mixed young for- (Western, Central). est and favourable places for light-demanding plants In the Balkan Peninsula S. ×latifolia was found al- are scarce. Along the road towards the summit we ready in 1901, near Drzina village, now in Serbia (Tošev have observed only saplings and young sterile speci- 106, SOM 36533), but the herbarium specimen collect- mens of S. aria s.l. and S. torminalis. ed there was determined by Tošev as S. aria. Subse- The locality of S. ×latifolia on Polovrak was discov- quently, B. Achtarov identified the plant correctly as “S. ered by Vihodcevsky in 1973 (KOR 19855; SO 72246). aria × S. torminalis” but this fact, as far as it is known, The plants collected there were determined by Gabri- has not been mentioned in botanical literature. elian as “Sorbus badensis Düll (S. aria × S. graeca)”, a In Flora Europaea (Warburg & Karpati 1968), S. nothomorph known only from Germany, now includ- ×latifolia is given as endemic to Europe, but in 1980 it ed in the S. latifolia group (Meyer & al. 2005). Our visit was mentioned by Maire (1980) from Morocco in NW to Polovrak was successful. We have found there a doz- Africa (O. Ghar-Rouban). In our opinion, the two spec- en or so shrubby individuals of S. ×latifolia in the sum- imens kept in KOR (nr 19958, Fig. 5), collected in 1962 mit area on the steep, rocky south-facing slope (Fig. 2). by Coode and Yaltirik near Kastamonu in N Turkey, be- The woody taxa in the immediate vicinity include Ac- long also to this taxon. These plants, received as dupli- er campestre L., Corylus avellana L., Cotoneaster niger cates from the Royal Botanic Garden Edinburgh (E), (Fries) Fries, C. tomentosus (Aiton) Lindl., Crataegus have been determined as “S. aff. kusnetzovii Z.”. The her- rhipidophylla Gand., Cytisus hirsutus L., Euonymus ver- barium sheets from E are cited by Gabrielian (1972) in rucosus Scop., Fagus sylvatica L., Fraxinus ornus L., Ju- the Flora of Turkey among the atypical specimens of S. niperus communis L., Prunus cerasifera Ehrh., Prunus kusnetzovii Zinserl.: “A specimen from A4 Kastamonu (35 km from Daday to Azdavay, D. 38662!), which dif- fers in its ovate, markedly acuminate leaves but oth- erwise resembles this species, probably belongs here”.
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