Lamiaceae) in Turkey with a Taxonomic Note
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Biologia 67/4: 663—672, 2012 Section Botany DOI: 10.2478/s11756-012-0049-2 Anatomical and micromorphological studies on Teucrium sect. Isotriodon (Lamiaceae) in Turkey with a taxonomic note Muhittin Dinc¸1 &S¨uleyman Dogu˘ 2 1Department of Biology Education, Ahmet Kele¸so˘glu Education Faculty, Necmettin Erkaban University, 42090 Meram, Konya, Turkey; e-mail: [email protected] 2Department of Science Education, Ahmet Kele¸so˘glu Education Faculty, Necmettin Erkaban University, 42090 Meram, Konya, Turkey Abstract: In this study, the anatomical features of the leaf and stem, besides the nutlet characteristics of some Teucrium sect. Isotriodon (Lamiaceae) taxa in Turkey, T. montbretii Betham subsp. montbretii, T. montbretii subsp. pamphylicum P. H. Davis, T. odontites Boiss. & Bal., T. cavernarum P. H. Davis, T. antitauricum T. Ekim, along with an isolated population of T. montbretii (T. montbretii subsp.) were investigated. The anatomical studies revealed that the taxa share generally similar anatomical characters, such as thicker upper leaf cuticles and larger upper leaf epidermal cells compared to lower ones and diacytic to anomocytic stomata on the leaves. However, the portion of the mesophyll occupied by palisade parenchyma and the occurrence of mucilage cells in leaf epidermis shows difference among the taxa. Furthermore, the studied taxa have general stem characteristics of the Lamiaceae family, except for having poorly developed collenchyma at the corners. With the amphistomatic leaves and developed sclerenchymatic tissue in the leaf median vein, T. cavernarum is seperated from the other taxa. Trichome types on the vegetative organs and nutlet shape and sculpturing are generally the same or similar in the studied taxa, but trichomes on the nutlets are different among them. Based on nutlet characteristics and some morphological ones, it was revealed that the isolated population of T. montbretii represent a new subspecies, T. monbretii subsp. yildirimlii M.Din¸c&S.Do˘gu subsp. nov. Key words: Teucrium; Isotriodon; anatomy; micromorphology; taxonomy; Lamiaceae; Turkey Introduction (Duman 2000; D¨onmez 2006; Ozhatay¨ & K¨ult¨ur 2006; Parolly & Eren 2007; D¨onmez et al. 2010; Din¸cet Family Lamiaceae has a cosmopolitan distribution al. 2011a). Sect. Isotriodon is characterized by dwarf, and consists of 236 genera and about 7000 species suffrutescent, fragile, saxatile, and herbaceous habitus; (Stevens 2001). Many species of Lamiaceae family terete stems with dentate or entire margined leaves; have economic importance because of the essential oil simple and secund recemes; gibbous-based and bilabiate production. Lamiaceae was divided into seven sub- calyces; and small nutlets (Ekim 1982). It is represented families: Symphorematoideae, Viticoideae, Ajugoideae, by seven species in Turkey (Din¸c et al. 2011a). Prostantheroideae, Nepetoideae, Scutellarioideae, and Studies on nutlet in Lamiaceae have shown it to Lamioideae (Harley et al. 2004). be useful to varying degrees at different levels of the Teucrium L. is one of the largest genera of the sub- taxonomic hierarchy (Marin et al. 1994; Navarro & El family Ajugoideae. It is polymorphic genus including Oualidi 2000; Moon & Hong 2006; Din¸c&Do˘gan 2006; about 300 species in the world (Cramer 1981). The Kaya & Kutluk 2007; Kaya & Dirmenci 2008; Din¸cetal. genus has cosmopolitan distribution, mainly in Eu- 2009a; Eshratifar et al. 2010). The absence or presence rope, North Africa and in the temperate parts of Asia and types of trichomes on the nutlets and the vegetative (K¨astner 1989; Abu-Assab & Cantino 1993). It has been parts have taxonomic value in clarification of sectional divided into ten sections, identifiable through the ca- boundaries in Teucrium. Teucrium sect. Isotriodon is lyx shape and the inflorescence structure (McClintock characterised by the elongated thick-walled trichomes & Epling 1946; Tutin & Wood 1972). These sections on the vegetative parts and subsessile glandular tri- are Teucropsis Benth., Teucrium Benth., Chamaedrys chomes on the nutlets (Navarro & El Oualidi 2000). (Mill.) Schreb., Polium (Mill.) Schreb., Isotriodon In addition, in description of Teucrium pseudaroanium Boiss., Pycnobotrys Benth., Scorodonia (Hill) Schreb., as a new species fom sect. Teucrium,trichometype Stachybotrys Benth., Scordium (Mill.) Benth., and and density were used as additional diagnostic char- Spinularia Boiss. acter from its close relatives (Parolly & Eren 2007). The genus Teucrium L. (Lamiaceae) is represented Many anatomical studies were carried out in the by 46 taxa included in 34 species and 8 sections in family Lamiaceae. The anatomical characters have Turkey. Twelve species and two subspecies are endemic shown it to be important at different systematic lev- c 2012 Institute of Botany, Slovak Academy of Sciences 664 M. Dinc¸ &S.Dogu˘ Table 1. Studied materials of sect. Isotriodon taxa. Locality Collection data T. montbretii subsp. C6 ADANA: Feke, Feke-S¨uphandere arası, S¨uphandere’ye 5 km kala, M.Din¸c 3310 & S. Do˘gua,d Sencan Dere kenarı, kayalık yama¸clar, 750–850 m, 6 Jul 2010 C6 ADANA: Feke, Feke-S¨uphandere arası, S¨uphandere’ye 5 km kala, M.Din¸c 3344b,c,d Sencan Dere kenarı, kayalık yama¸clar, 750–850 m, 28 Jul 2010 T. montbreti subsp. C6 HATAY: Antakya, St. Peter Kilisesi civarı, kayalık yama¸clar, 100 M.Din¸c 3322 & S. Do˘gua,b,c,d montbretii m, 07 Jul 2010 C6 HATAY: Samanda˘g, sahile bakan kayalık yama¸clar,50m,07Jul M.Din¸c 3315 & S. Do˘gua,d 2010 T. montbretii subsp. C3 ANTALYA: Konyaaltı, T¨uneller B¨olgesi, kayalık yama¸clar, 100 m, M.Din¸c 3336 & S. Do˘gua,b,c,d pamphylicum 23 Jul 2010 T. odontites C3 MERSIN:˙ A¸sa˘gıke¸slik K¨oy¨u, G¨uzeldere, kayalık yama¸clar, 280 m, S. Do˘gu 2456a,b,c 25 Jul 2010 T. cavernarum C4 KARAMAN: Ermenek, Teke¸catı mevkii, 1400 m, kayalık yama¸clar, S. Do˘gu 2052a 19 Aug 2009 C4 KARAMAN: Ermenek, Teke¸catı mevkii, 1400 m, kayalık yama¸clar, S. Do˘gu 2476 & M. Din¸cb,c 11 Oct 2010 T. antitauricum C6 ADANA: S¸aimbeyli, Obruk Ielalesi˙ civarı, kayalık yama¸clar, 1100 M.Din¸c 3308 & S. Do˘gua m, 06. Jul 2010 C6 ADANA: Saimbeyli, Saimbeyli-Feke arası, Saimbeyli ¸cıkı¸sı, kayalık M.Din¸c 3309 & S. Do˘gub,c yama¸clar, 1000 m, 06 Jul 2010 aThe specimens used for anatomical studies bThe specimens used for the nutlet studies using stereo-microscope cThe specimens used for the nutlet studies using SEM dThe specimens used for the general morphological studies els. The systematic value of leaf epidermal micromor- taxon. The cross-sections were stained with basic fuchsine. phological characteristics was useful only subtribal level All sections were covered by glycerin gelatin and made into in Mentheae. But, the combination of the anatomical permanent slides as described by Vardar (1987). Preparats characters has taxonomic value in segregation of some were observed through an Olympus BX-50 microscope and related species in Lamiaceae. These characters have di- photographed using “kameram” apparatus attached to the microscope. Anatomical characteristics and trichome mor- agnostic value in separation of the related Teucrium phology was defined by observations of the preparats under species from the same section (Din¸c et al. 2009b). More- the light microcope. Trichome terminology follows Navarro over, they were used as additional diagnastic characters & El Oualidi (2000). The stomatal index was calculated ac- in reinstatement of Teucrium andrusi Post from its sib- cording to Meidner & Mansfield (1968). When the stomata ling species T. paederotoides Boiss. & Hausskn. in Teu- and the epidermal cells number is given, the unit are refers crium sect. Isotriodon. the view area under the objective × 20. Each quantitive The objective of this study is to investigate the anatomical character was measured 20 times, and the data anatomical and nutlet macro-micromorphological char- was given as minimum-maximum (mean ± standart devia- acters of some species of sect. Isotriodon and to deter- tion). For micromorphological studies on the nutlets, mature mine the systematic value of these characters in spe- nutlets were mounted directly on stubs with double-side cific and infraspecific segregation of the taxa. Beside, adhesive tape and coated with gold. The nutlets were ex- it is to clarify the taxonomic position of T. montbretii amined by SEM, and the best representatives were pho- samples collected from an isolated area and showing tographed in general and in detail. For each taxon, 20 nut- some morphological differences from Teucrium mont- lets were measured, and the data was given as minimum- bretii subspecies in Turkey. maximum (mean ± SD). Nutlet sculpture terminology fol- lows Punt et al. (1994). Features similar in the studied taxa were not emphasized when presenting the results. Material and methods The samples belonging to Teucrium sect. Isotriodon were Results collected from different parts of Turkey in 2010. The collec- tion data of the populations is given in Table 1. The sam- Anatomy ples were dried according to standard herbarium technics Stem anatomy: The stem is more or less terete in trans- and conserved at the herbarium of the Necmettin Erkaban verse section. The epidermis is single-layered and con- University Ahmet Kele¸so˘gluEducation Faculty. sists of angular and ovoid cells whose walls are thick- Some of the specimens were put in 70% alcohol for ened, and is covered by a thick layer of cuticle. On anatomical studies. Anatomical studies were carried out on 10 samples, on average, of each population. In these samples, the epidermis there are glandular and non-glandular leaves and stem cross-sections were studied with the lower trichomes. The type of glandular trichome is simple and upper surface sections of the leaves. On average, twenty short and long clavate and subsessile glandular. Clavate preparations were made of each type of sections for each glandular trichomes have a single secretory head cell, Anatomical and morphological studies on Teucrium sec. Isotriodon in Turkey 665 Table 2. Important anatomical characters of the studied taxa (1.