Pollen morphology of <i>Verbascum</i> L. (Scrophulariaceae) in Northern and Central Iraq

Abstract

The present study highlights the taxonomic values of the pollen features of 20 species of Verbascum L. in Iraq. The pollen grains were acetolysed and observed under Light and Electron microscopes. Our results showed that the pollen grains of these species are usually radially symmetrical, isopolar, tricolporate and display reticulate sculpturing. The variations were found in shape, size, and exine thickness. Most of the species are subprolate, prolate spheroidal, and prolate, whereas oblate spheroidal pollens were found only in V. thapsus. The pollen size among the species studied ranges from 16.2-32.5 µm. The majority of species are medium sized except V. agrimoniifolium and V. oreophilum that are small sized, and four species i.e. V. palmyrense, V. sinuatum, V. songaricum, and V. thapsus having both small and medium sized pollen grains. Moreover, the result showed that the exine thickness ranges from 0.87-4.75 µm, but this value can overlap between some species. Therefore, only the shape of pollen grains could be used to classify these species into groups.DOI: http://dx.doi.org/10.3329/bjpt.v21i2.21355Bangladesh J. Plant Taxon. 21(2): 159-165, 2014 (December)

Anatomy, Pollen and Seed Morphology of Endemicspecies Verbascum Globiferumhub.-Mor. and V. Lysiosepalum Hub.-Mor. (Scrophulariaceae)In Diyarbakir, Turkey and Their Taxonomic Importance

“…There are few studies on the morphological and anatomical features of the genus (Çakır and Bağcı, 2006). There are many SEM studies based on pollen morphology of the some Verbascum species taxa (Juan et al, 1997;Dane and Yilmaz, 2002;Kheyri, 2009;Asmat et al, 2011;Al-Hadeethy et al, 2014;Öztürk et al, 2018;Aktas, 2019;Aktas et al, 2020;Baser, 2021). Seed micromorphology of the genus Verbascum has been examined by several researchers including Juan et al (1997), Petkovié et al (1997), Attar et al (2007), Kheiri et al (2009), Cabi et al (2011), Aktas 2019, andAktas et al 2020.…”

“…Özturk et al (2018) reported that there were tricolporate and tricolpate aperture types in their pollen study on V. pycnostachyum (K groups). Al-Hadeethy et al (2014) stated that the aperture types of Verbascum species (20 species) were tricolporate. Aperture type of Verbascum reported to have tricolporate aperture type (Kheiri et al, 2006;Asmat et al, 2011).…”

A new natural hybrid of Verbascum L. (Scrophulariacae) from Turkey

“…The pollen morphologies of V. × aytachii and its parents were compared and some differences were found in terms of these characteristics. Al-Hadeety et al [47] observed the variations in pollen shape of 20 species of Verbascum from Iran. They divided the Verbascum species they investigated into four groups according to the pollen shape: prolate-spheroidal, prolate, subprolate and also oblate-spheroidal.…”

Morphology, Anatomy, Palynology and Seed Micromorphology of Turkish Endemic Verbascum exuberans Hub.-Mor. (Scrophulariaceae)

“…Kheyri et al (2006) reported that V. mucronatum pollen has prolate, and prolate-spheroidal shapes, with polar axis ranging between 25.08-40.12 μm, and equatorial axis between 15.48-28.84 μm. Al-Hadeethy et al (2014) reported that some Verbascum pollen has prolate shape. Pollen shape of V. thapsus were oblate-spheroidal (Asmat et al, 2011).…”

“…Anatomical investigations on some Verbascum species have been carried out by Koktay (1974), Lersten and Curtis (1997), Bagci and Çakir (2005), Çakir and Bagci (2006), Özdemir and Altan (2007), Kheiri et al (2009), Yilmaz and Dane (2011), Alan and Gökman (2015) and Küçük (2017). There are many SEM studies based on seed micromorphology of the some Verbascum species taxa (Juan et al, 1997;Petkovié et al, 1997;Karaveliogullari et al, 2006Karaveliogullari et al, , 2011Karaveliogullari et al, , 2014Attar et al, 2007;Kheiri et al, 2009;Cabi et al, 2011;Aytaç and Duman, 2012;Duman et al, 2017) Pollen morphology of the genus Verbascum has been examined by several researchers, including Lobin and Pormbski (1994), Karaveliogullari et al (2005Karaveliogullari et al ( , 2011Karaveliogullari et al ( , 2014, Bagci and Çakir, (2005), Bukhari and Alfarhan (2006), Çakir and Bagci (2006), Kheriri et al (2006), Pehlivan et al (2008), Yilmaz andDane (2011), Asmat et al (2011), Aytaç and Duman (2012), Al-Hadeethy et al (2014), Ranjbar and Nouri (2015), Duman et al (2017) and Öztürk et al (2018). There is no anatomical and palynological record for Verbascum exuberans Hub.-Mor.…”