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Anatomical traits of endemic and relict Amphoricarpos neumayerianus (Asteraceae) from Montenegro

AuthorsGavrilović, Milan; Rančić, Dragana; Garcia-Jacas, Núria ; Susanna de la Serna, Alfonso ; Dajić-Stevanović, Zora; Marin, Petar D.; Janačković, P.
Issue Date16-Sep-2019
CitationSymposium Plant Anatomy (2019)
AbstractThe genus Amphoricarpos comprises heterocarpic perennial mountain chasmophytic plants from the eastern Mediterranean (the Balkans, Anatolia and the Caucasus) of complex taxonomy (Susanna, Garcia-Jacas, 2009). There are three taxa distributed on the Balkan Peninsula: A. neumayerianus (Vis.) Greuter, A. autariatus Blečić et Mayer ssp. autariatus Blečić et Mayer and A. autariatus Blečić et Mayer ssp. bertisceus Blečić et Mayer (Blečić, Mayer, 1967; Greuter, 2003). Some authors have suggested that all Balkan Amphoricarpos should be treated as a single species, A. neumayerianus (Caković et al., 2015). In this work, anatomical investigations of vegetative organs of A. neumayerianus s. str., a Tertiary relict from Mt. Orjen (Montenegro), endemic for the Dinaric Alps, were conducted. The aim of this study was to investigate anatomy and to find possible new valid taxonomic characters. Microscopic slides were prepared following the standard histological procedures (Ruzin, 1999). In young root cross section, tetrarch radial vascular bundle is observed, while typical secondary tissues occur in the older root cross-section with well developed exodermis on its surface. In the rhizome cross section, the secondary tissues are noticed, with well developed periderm on its surface and parenchyma cortex below. In the central cylinder, a well developed xylem is noticed, which is interrupted by wide parenchyma rays. The pith, composed of very large parenchyma cells, is found in the central region. The upper stem cross section is characterized by more or less polygonal outline with one-layered epidermis, and by a well developed cortex of one cell thick layers of collenchyma and parenchyma, below. Medullary collateral vascular bundles are arranged in a circle, while a few cortical vascular bundles are also noticed. The leaf blade is amphis- 89 tomatous, dorsiventral. One vascular bundle, or one large and two small vascular bundles are in the heart-shaped main vein, with a surrounding parenchyma sheath which extended to both epidermises. Densely distributed, curly, non-glandular trichomes as well as biseriate glandular trichomes are present on the upper stem, as well as on both leaf sides, but much more so on the abaxial one. Observations examined here could be useful in resolving relationships of A. neumayerianus and close related taxa within the Amphoricarpos – a small but very complex genus from taxonomic and phylogenetic points of view
DescriptionTrabajo presentado en el Symposium “Plant anatomy: traditions and perspectives”, celebrado del 16 al 21 de septiembre de 2016 en Moscú (Rusia)
Appears in Collections:(IBB) Comunicaciones congresos
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