Browsing by Author "Dirmenci, Tuncay"

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Cirsium sivasicum sp. nov. and C. peshmenianum sp. nov. (Asteraceae) and their allies from Turkey
(Wiley, 2011) Yıldız, Bayram; Arabacı, Turan; Dirmenci, Tuncay; Çelenk, Sevcan; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Anabilim Dalı.; 0000-0003-4925-8902; K-2981-2012; 24170598000
Two new species of Cirsium Mill. from east Anatolia (Turkey): C. sivasicum Yildiz, Arabaci & Dirmenci and C. peshmenianum Yildiz, Dirmenci & Arabaci, are described and illustrated. Both new species belong to C. sect. Epitrachys DC. (Asteraceae: Cardueae) and are closely related to C. rigidum DC., C. leuconeurum Boiss. & Hausskn. and C. karduchorum Petr. The differences between the new species and their allies are discussed and a diagnostic key is provided. A detailed description of a previously poorly known species, C. leuconeurum, is also provided. The pollen grain morphology of the new species and their allies were investigated with light and scanning electron microscopes. Based on the shape of the spines and the surface ornamentation, the pollen grains of the species were divided into 3 types: C. rigidum and C. sivasicum (type I), C. leuconeurum and C. pesmenianum (type II), C. karduchorum (type III).
Homoploid hybrids of Origanum (Lamiaceae) in Turkey: Morphological and molecular evidence for a new hybrid
(Taylor & Francis, 2021-05-04) Arabacı, Turan; Özcan, Taner; Martin, Esra; Yazıcı, Türker; Açar, Mikail; Uzel, Devrim; Dirmenci, Tuncay; Çelenk, Sevcan; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü.; 0000-0003-4925-8902; K-2981-2012; 24170598000
In this study, three hybrids of Origanum (Lamiaceae) were examined in detail using morphological, karyological, palynological and molecular approaches. One of the three hybrids, O. x aytacii, is here described for the first time, and is compared with its putative parents, O. sipyleum and O. vulgare subsp. hirtum. In addition to morphological, karyological and palynological features, we also examined nuclear ribosomal DNA (ITS) sequences of O. x intermedium (O. onites x O. sipyleum), O. x intercedens (O. onites x O. vulgare subsp. hirtum) and their purported parental species that share the same area with the new hybrid. Pollen grains were hexacolpate and isopolar. The range of Polar/Equatorial ratio (P/E) of pollen for investigated taxa varied from 0.74 to 0.99. All investigated taxa are diploid with a chromosome number as 2n = 30. According to molecular results, O. x aytacii was the most polymorphic taxon. In addition, DNA sequences showed that O. x intercedens was more similar to O. vulgare subsp. hirtum than to O. onites, and O. x intermedium was more similar to O. onites than to O. sipyleum. Furthermore, O. onites and O. vulgare subsp. hirtum have many different ITS haplotypes, probably resulting from backcrossing with different individuals. Results obtained in this study demonstrate that hybridization has played a major role in the process of Origanum speciation.
An important hybrid zone: Evidence for two natural homoploid hybrids among three Origanum species
(Finnish Zoological Botanical Publishing Board, 2020-05) Dirmenci, Tuncay; Özcan, Taner; Yazıcı, Türker; Arabacı, Turan; Martin, Esra; Çelenk, Sevcan; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü.; 0000-0003-4925-8902; K-2981-2012; 24170598000
Based on combined results of different approaches we describe two new natural hybrids, Origanum x bilgilii Dirmenci, T. Yazici & Arabaci and O. x dumanii Dirmenci, Arabaci & T. Yazici from southern Turkey (Antalya). They have a common parent, Origanum saccatum. Morphology and pollen micromorphology of the collected plants were studied, and a comparison of one nuclear (nrITS) and one chloroplast (rpl32) DNA marker was performed. The ploidy level of the two hybrids was established by chromosome counts. Both hybrids have some morphological characters in the leaves. bracts, calyces and corollas that are intermediate between those of their parents. Surface sculpturing and pollen grain size and shape of the hybrids vary and differ to a certain degree from those of the parental species. Heterozygous loci were detected in nrITS sequences of both O. x bilgilii and O. x dumanii, while rpl32 sequences were uninformative. Both hybrids and their parents have the same chromosome number of 2n = 30.
A new species and a new natural hybrid of Origanum L. (Lamiaceae) from the west of Turkey
(TÜBİTAK, 2017-09-15) Dirmenci, Tuncay; Yazıcı, Türker; Özcan, Taner; Martin, Esra; Çelenk, Sevcan; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü.; 0000-0003-4925-8902; K-2981-2012; 24170598000
Origanum ayliniae Dirmenci & Yazici, which differs significantly from O. dictamnus L., is described for the first time in this paper. In addition, a new hybrid, O. x adae Dirmenci & Yazici, between O. ayliniae and O. sipyleum L., is described and investigated in detail. The general morphology, pollen structure, chromosome features, and nuclear (ITS) and chloroplast (rpl32) genomes of collected specimens were studied. O. x adae was determined to have some intermediate properties morphologically and palynologically that place it between the parents. Pollen size and shape were important features in the diagnosis of the hybrid and its parents in this study. The somatic chromosome number of O. ayliniae, O. x adae, and O. sipyleum was counted as 2n = 30. According to the results of these different approaches, O. ayliniae differs significantly from O. dictamnus, which has a close relationship with O. ayliniae, and O. x adae has a hybrid nature. These results support previous reports for the speciation of Origanum members via hybridization. This study aimed to present a new species (O. ayliniae), a new hybrid of O. x adae, and their differences. In conclusion, O. ayliniae, O. x adae, and O. sipyleum provide significant morphological, micromorphological, palynological, cytological, and molecular information about homoploid hybridization.
A palynological study of the genus Nepeta L. (Lamiaceae)
(Springer, 2008-11) Dirmenci, Tuncay; Çelenk, Sevcan; Malyer, Hulusi; Bıcakçı, Adem; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü.; 0000-0003-4925-8902; 0000-0002-6333-3123; K-2981-2012; O-1244-2018; 24170598000; 6602736554; 6701674542
The pollen morphology of forty taxa of the genus Nepeta L. was studied and documented in detail using light microscopy (LM) and scanning electron (SEM) microscopy in this study. Nepeta L. pollen grains are small to large (P = 18.64-63.46 mu m, E = 15.62-46.33 mu m), suboblate to perprolate (P/E = 0.86-2.09) in shape and hexacolpate (very rarely tetracolpate) with granular membranes. Alternate position of colpi occurs in six Nepeta taxa, N. nuda ssp. glandulifera, N. concolor, N. crinita, N. congesta var. cryptantha, N. stricta var. stricta and N. sibthorpii ssp. tumeniana. In examinations of exine ornamentation with SEM, two types of pollen grains were recognized: (1) type I, with microreticulate sculpture; and (2) type II with bireticulate sculpture, type I and II to be divided into two and five subtypes, respectively. In the two taxa with microreticulate pattern, N. pilinux and N. sulfuriflora, a tendency towards a bireticulum could be recognized due to traces of secondary tectal connections. The bireticulate exine ornamentation is characterized with varying characteristics of the primary muri and secondary reticulum. Pollen morphology within the genus is compared with infrageneric relationships.
Some evidence for infrageneric classification in Ziziphora L. (Lamiaceae:Mentheae)
(Taylor & Franscis , 2015-03-04) Selvi, Selami; Martin, Esra; Satil, Fatih; Dirmenci, Tuncay; Sevcan, Çelenk; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü.; 0000-0003-4925-8902; K-2981-2012; 24170598000
The genus Ziziphora L. (Lamiaceae) consists of annual herbs, except Ziziphora clinopodioides, and is represented by six taxa in the flora of Turkey: Z. clinopodioides, Z. capitata, Z. persica, Z. tenuior, Z. taurica subsp. taurica and Z. taurica subsp. cleonioides. They are strong aromatic herbs and important medicinal plants. This study has been conducted to determine the palynological and karyological features of these taxa. The pollen morphology and exine structure of Ziziphora species were investigated by light microscope and scanning electron microscope. Pollen grains were determined as hexacolpate, medium in size and a circular or elliptic amb. The shape of pollen grains varies from oblate to prolate spheroidal. Ornamentation types of pollen grains are bireticulate, microreticulate or perforate. Somatic chromosome number has been determined and counted as 2n=16, 18. Results indicate that the pollen characters and chromosome numbers of the genus are valuable for taxonomic applications and may be useful for infrageneric classification.