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Full-Text Articles in Life Sciences
The Effects Of Ppal-1 In Arabidopsis Gamete Development, Amanda J White, Susana Perez-Martinez, Mark P. Running
The Effects Of Ppal-1 In Arabidopsis Gamete Development, Amanda J White, Susana Perez-Martinez, Mark P. Running
The Cardinal Edge
Prenylation is a type of post-translational modification in which a 15- or 20-carbon lipid is added to the carboxyl (C) terminus of the protein. Arabidopsis thaliana contains the PROTEIN PRENYLTRANSFERASE ALPHA SUBUNIT-LIKE (PPAL) gene, which encodes a protein with homology to the α-subunits of the three known prenylation enzymes, PFT, PGGT, and Rab-GGT. We previously identified two mutations in PPAL, one of which is ppal-1, which contains a T-DNA insertion in the fourth intron. We have previously observed that self-fertilizing heterozygous ppal-1 plants produce progeny in which homozygous ppal-1 is underrepresented. This project attempts to ascertain …
A New Asperula L. (Rubiaceae) Species From Gypsum Steppes Of Çankırı Province In Turkey, Bi̇lal Şahi̇n, Mehmet Sağiroğlu, Bi̇rol Başer
A New Asperula L. (Rubiaceae) Species From Gypsum Steppes Of Çankırı Province In Turkey, Bi̇lal Şahi̇n, Mehmet Sağiroğlu, Bi̇rol Başer
Turkish Journal of Botany
Asperula cankiriense B.Şahin & Sağıroğlu, a new species discovered in the central Anatolian region of Turkey (Çankırı), is described herein. A. cankiriense is similar to Asperula bornmuelleri Velen. However, A. cankiriense differs mainly in its habitus, stem, leaves, and inflorescence features. In this study, the diagnostic morphological features, distribution, habitat and ecology, etymology, conservation status, and taxonomic features of the new species are discussed. Additionally, pollen micromorphological characteristics of A. cankiriense and A. bornmuelleri are examined and compared using light microscopy (LM) and scanning electron microscopy (SEM) analyses. The pollen grains are subprolate, aperture type 6?7 or rarely 8 zonocolpate …
Taxonomic Monograph Of The Tribe Nigelleae (Ranunculaceae): A Group Including Ancientmedicinal Plants, Ali̇ Aslan Dönmez, Zübeyde Uğurlu Aydin, Emel Oybak Dönmez
Taxonomic Monograph Of The Tribe Nigelleae (Ranunculaceae): A Group Including Ancientmedicinal Plants, Ali̇ Aslan Dönmez, Zübeyde Uğurlu Aydin, Emel Oybak Dönmez
Turkish Journal of Botany
The tribe Nigelleae Schröd. (Ranunculaceae) worldwide distribution has been studied taxonomically, based on morphological, palynological and seed morphological characters, as well as chromosome counts. Extensive field works have been carried out in Turkey, Greece, Iran, Syria, Lebanon, Portugal and in Northern Cyprus. Moreover, the specimens of major herbaria in Turkey, Ukraine, Russia, Syria and Iran as well in Europe have been examined. This study represents the most comprehensive monograph of the tribe based on field work across its nearly entire distributional range, complemented by examination of over 980 specimens from 25 herbaria and our collections with nomenclatural contributions. Eighteen species …
Biology Of Flowering And Insect Visitors Of Iris Aphylla L. (Iridaceae), Agnieszka Dabrowska, Magdalena Smigala, Bozena Denisow, Krystyna Winiarczyk
Biology Of Flowering And Insect Visitors Of Iris Aphylla L. (Iridaceae), Agnieszka Dabrowska, Magdalena Smigala, Bozena Denisow, Krystyna Winiarczyk
Turkish Journal of Botany
The paper presents the morphology of the flower of Iris aphylla L., which is a protected species in many European countries. The study comprises phenological observations of flowering and assessment of nectar and pollen production, and flowering and fruiting abundance. Additionally, the number of insect visitors on the flowers was monitored. The investigations of specimens originating from 4 populations in central-eastern Poland (Wyzyna Lubelska Upland) were conducted in the Botanical Garden of Maria Curie-Sklodowska University. It was found that morphological features of the analysed flowers, i.e. the 6-angular ovary and the perianth tube, which is 2-fold longer than the ovary, …
Systematics Value Of Micromorphological And Palynological Characters In Stenocephalum Sch.Bip. (Vernonieae, Asteraceae), Maria Betiana Angulo, Laura Chalup, Massimiliano Dematteis
Systematics Value Of Micromorphological And Palynological Characters In Stenocephalum Sch.Bip. (Vernonieae, Asteraceae), Maria Betiana Angulo, Laura Chalup, Massimiliano Dematteis
Turkish Journal of Botany
Micromorphological and palynological characters of all Stenocephalum Sch.Bip. species (Vernonieae, Asteraceae) were analyzed to evaluate their reliability as taxonomic markers at generic level and discussed in relation to other genera of the subtribe Lepidaploinae. Characters such as pubescence of corollas and cypselae showed glandular and nonglandular trichomes allowing differentiation among related species. Apical appendages without glandular trichomes, caudate anthers, and carpopodium structure are common characteristics among Stenocephalum species. With the exceptions of S. megapotamicum and S. tragiaefolium, almost all species of the genus showed style bases without basal nodes for the first time. Crystals on the fruits wall were also …
A Taxonomic Study Of The Silene Sections Behenantha And Dichotomae (Caryophyllaceae) In Turkey Based On The Micromorphology Of Their Seed And Pollen, Mehmet Kuh, Kemal Yildiz, Ersi̇n Mi̇nareci̇
A Taxonomic Study Of The Silene Sections Behenantha And Dichotomae (Caryophyllaceae) In Turkey Based On The Micromorphology Of Their Seed And Pollen, Mehmet Kuh, Kemal Yildiz, Ersi̇n Mi̇nareci̇
Turkish Journal of Botany
The seed and pollen grain micromorphologies of 10 taxa of the Silene sections Behenantha and Dichotomae (Caryophyllaceae) were analyzed in this study. Although the seeds of the analyzed taxa were generally reniform, S. tenuiflora and S. koycegizensis from the section Behenantha were clearly distinct from other taxa, while subspecies of S. dichotoma and S. euxina in the section Dichotomae showed differences. Pollen grains are periporate and spheroidal and ornamentation is generally spinulate-microperforate in all taxa. However, ornamentation is spinulate in S. euxina and semireticulate in S. koycegizensis. While the exine structure is generally tectate, it is semitectate in S. koycegizensis. …
A New Species Of Plectranthus (Lamiaceae) From Saudi Arabia, Kadry Abdel Khalik
A New Species Of Plectranthus (Lamiaceae) From Saudi Arabia, Kadry Abdel Khalik
Turkish Journal of Botany
Plectranthus hijazensis Abdel Khalik (Lamiaceae) is described as a new species from Al-Baha Province in Saudi Arabia. Information given on the new species includes a taxonomic description and its affinity to Plectranthus asirensis L. A key to Plectranthus species of Saudi Arabia is provided, and the relationships of the species and the relevant morphological characters, particularly seed, pollen grains, trichomes, and anatomy of stem and leaf, are discussed. A distribution map of the new species and related species is provided.
Pollen Morphology Of The Genus Onobrychis (Fabaceae) In Turkey, Süleyman Avci, Cengi̇z Sancak, Alp Can, Aydan Acar, Nur Münevver Pinar
Pollen Morphology Of The Genus Onobrychis (Fabaceae) In Turkey, Süleyman Avci, Cengi̇z Sancak, Alp Can, Aydan Acar, Nur Münevver Pinar
Turkish Journal of Botany
The pollen size and morphology of 20 Onobrychis Adans. taxa from Turkey were studied using both light and scanning electron microscopy. Of the taxa studied, Onobrychis fallax Freyn & Sint. and Onobrychis elata Boiss. & Balansa showed the smallest size of pollen grains, while the largest were found in Onobrychis aequidentata (Sibth. & Sm.) d'Urv. and Onobrychis viciifolia Scop. The pollens of all taxa studied represent the tricolpate type of pollen and are prolate in shape. The type of exine found in the studied taxa is reticulate (sect. Dendobrychis DC. and sect. Laphobrychis Hand.-Mazz.), suprareticulate (sect. Onobrychis), or microreticulate (sect. …
Airborne Pollen Content Of Kuşadası, Aycan Tosunoğlu, Ayşe Yeni̇gün, Adem Biçakçi, Kayi Eli̇açik
Airborne Pollen Content Of Kuşadası, Aycan Tosunoğlu, Ayşe Yeni̇gün, Adem Biçakçi, Kayi Eli̇açik
Turkish Journal of Botany
Atmospheric pollen grains of Kuşadası were captured using Durham samplers and investigated in 2005. The total number of pollen grains and the pollen grains/cm^2 were calculated from slides that were changed weekly. During the study period a total of 12,980 pollen grains/cm^2 belonging to 44 identified taxa and unidentified pollen grains were recorded at 2 stations. At the first station (S1), 7346 pollen grains were counted per cm^2, while only 5634 pollen grains were counted at the second station (S2). The majority of the investigated pollen grains were from Olea europaea L. (34.46%), Cupressaceae/Taxaceae (30.04%), Pinus spp. (19.71%), Platanus spp. …
Pollen And Seed Morphology Of Resurrection Plants From The Genus Ramonda (Gesneriaceae): Relationship With Ploidy Level And Relevance To Their Ecology And Identification, Maja Lazarevic, Sonja Siljak - Yakovlev, Predrag Lazarevic, Branka Stevanovic, Vladimir Stevanovic
Pollen And Seed Morphology Of Resurrection Plants From The Genus Ramonda (Gesneriaceae): Relationship With Ploidy Level And Relevance To Their Ecology And Identification, Maja Lazarevic, Sonja Siljak - Yakovlev, Predrag Lazarevic, Branka Stevanovic, Vladimir Stevanovic
Turkish Journal of Botany
The pollen and seeds of 3 paleoendemic resurrection species, Ramonda myconi (L.) Rchb. (Iberian Peninsula), R. nathaliae Pancic & Petrovic, and R. serbica Pancic (Balkan Peninsula), as well as of natural hybrids between the 2 last species, have been analyzed using light and scanning electron microscopy. Their general structural differences, taxonomic and phylogenetic significance, pollen viability, and seed germination capacity, as well as the correlation of pollen and seed characteristics and plant ploidy levels, have been studied. The pollen grains are small (R. myconi, R. nathaliae) to medium (R. serbica) in size, ranging from 10 to 28 µm, and 3-colporate, …
Air Pollution Effects On Flavonoids In Pollen Grains Of Some Ornamental Plants, Farkhondeh Rezanejad
Air Pollution Effects On Flavonoids In Pollen Grains Of Some Ornamental Plants, Farkhondeh Rezanejad
Turkish Journal of Botany
Phenolic compounds function as stress indicators because they accumulate to high levels in many plant tissues in response to a wide range of biotic and abiotic signals. These compounds are involved in pollen development, pollination, pollen germination, and pollen tube growth. The mature pollen grains of Spartium junceum L., Lagerstroemia indica L., Thuja orientalis L., and Petunia hybrida L. collected from control (less polluted) and polluted areas [mainly SO_2, NO_2, CO, hydrocarbons (HC), and airborne particulate material (APM)]. The ethanolic aquatic extracts of pollen grains were prepared. The extracts were analysed by high pressure liquid chromatography (HPLC). HPLC analysis demonstrated …
Rugaspermum Minuta - A New Species Of The Seed Genus Rugaspermum From The Triassic Of Nidpur, India, Nupur Bhowmik, Shabnam Parveen
Rugaspermum Minuta - A New Species Of The Seed Genus Rugaspermum From The Triassic Of Nidpur, India, Nupur Bhowmik, Shabnam Parveen
Turkish Journal of Botany
This paper provides a description of a new species of Rugaspermum D.D.Pant & Basu, R. minuta Bhowmik & Parveen, from the Nidpur Triassic beds. The dispersed seeds were recovered after macerating large chunks of shale in hydrofluoric acid. The structurally preserved compressed seed is platyspermic, orthotropus, and oval- to barrel-shaped with a short beak-like micropyle. The surfaces of the seeds are wrinkled and there is a wide lateral ridge running from the apex to the base on both the obverse and reverse sides. Upon maceration, the seed yielded 4 membranes: outer, inner, nucellar, and megaspore membranes. The outer cuticle of …
Verbascum Hasbenlii (Scrophulariaceae), A New Species From Turkey, Zeki̇ Aytaç, Hayri̇ Duman
Verbascum Hasbenlii (Scrophulariaceae), A New Species From Turkey, Zeki̇ Aytaç, Hayri̇ Duman
Turkish Journal of Botany
Verbascum hasbenlii Aytaç & H.Duman sp. nov. (sect. Bothrosperma Murb.) is described and illustrated from Turkey. This new species was collected in B1 Çan (Çanakkale Province) area. V. hasbenlii appears to be closely allied to V. luciliae (Boiss.) O.Kuntze and V. haraldi-adnani Parolly & Eren. Its affinities with this and other related species are discussed. The characteristic features of pollen, seed, stomata structure, and hairs are studied using a scanning electron microscope and the distribution of the new species in Turkey is given.
Analysis Of Chenopodiaceae-Amaranthaceae Airborne Pollen In Salamanca, Spain, David Rodríguez De La Cruz, Estefania Sanchez-Reyes, José Sánchez-Sánchez
Analysis Of Chenopodiaceae-Amaranthaceae Airborne Pollen In Salamanca, Spain, David Rodríguez De La Cruz, Estefania Sanchez-Reyes, José Sánchez-Sánchez
Turkish Journal of Botany
Chenopodiaceae-Amaranthaceae pollen represents an allergenic risk for pollen-sensitive people. The aim of this study was to describe the Chenopodiaceae-Amaranthaceae pollen dynamics in the atmosphere of Salamanca (mid-west Spain) during the years 2000-2007. Measurements were performed by the volumetric method using a Burkard spore trap located in the urban centre at the height of 20 m above ground level. This pollen type was mainly detected in the atmosphere between late spring and late summer, with an Atmospheric Pollen Season (APS) registered between late May and early October and maximum concentrations detected in August. The intradiurnal pattern, calculated by means of 3 …
Pollen Morphology Of The Genus Seseli L. (Umbelliferae) In Turkey, Ebru Doğan Güner, Hayri̇ Duman, Nur Münevver Pinar
Pollen Morphology Of The Genus Seseli L. (Umbelliferae) In Turkey, Ebru Doğan Güner, Hayri̇ Duman, Nur Münevver Pinar
Turkish Journal of Botany
Morphological features of pollen of 11 Turkish taxa belonging to the complex genus Seseli L. were examined using light and scanning electron microscopy. On the basis of exine sculpturing, 3 main types were recognised in Seseli: Type 1, rugulate at equator, psilate-perforate at pole; Type 2, striate-reticulate at equator, rugulate at pole; and Type 3, rugulate at equator, striate at pole. The study revealed that palynological characters display taxonomic significance in the genus.
Pollen Analysis Of Honeys From Varaždin County, Croatia, Mirjana Sabo, Mirjana Potocnjak, Ines Banjari, Danijela Petrovic
Pollen Analysis Of Honeys From Varaždin County, Croatia, Mirjana Sabo, Mirjana Potocnjak, Ines Banjari, Danijela Petrovic
Turkish Journal of Botany
The palynological properties of 8 honey samples commercially produced in 1 region in Croatia (Varazdin County) were determined. Each sample was examined to determine the pollen percentage and pollen spectrum. On the basis of honey pollen analysis, in these 8 samples different botanical origin was determined. In total, 20 different types of pollen grains were identified. The dominant group of pollen grains consisted of Castanea sativa Mill. in samples 2 and 8, Brassica napus L. in samples 4 and 5, and Trifolium pratense L. in samples 6 and 7. The pollen analysis revealed 6 unifloral and 2 multifloral honeys. Analysis …
Pollen And Seed Morphology Of Velezia L. (Caryophyllaceae) Genus In Turkey, İlham Eröz Poyraz, Ebru Ataşlar
Pollen And Seed Morphology Of Velezia L. (Caryophyllaceae) Genus In Turkey, İlham Eröz Poyraz, Ebru Ataşlar
Turkish Journal of Botany
In this study, pollen and seed morphology of Velezia L. (Caryophyllaceae) species in Turkey were investigated by light and scanning electron microscopy. The genus is represented by 5 species in Turkey: V. tunicoides P.H.Davis, V. hispida Boiss., V. quadridentata Sibth. & Sm., V. pseudorigida Hub.-Mor. and V. rigida L. Endemism ratio of the genus is 60%, which shows that Turkey is the gene center for this genus. The pollen grains of Velezia species are radially symmetrical and isopolar, oblate-spheroidal, operculate, and polypantoporate, pores with conical spinules on operculum. Pollen ornamentation, pore numbers, exine thickness, pore diameter, operculum ornamentation, and spinule …
Comparative Rapd Analysis And Pollen Structure Studies Of Bellis Perennis L., Nesli̇han Kavalcioğlu, Leyla Açik, Nur Münevver Pinar
Comparative Rapd Analysis And Pollen Structure Studies Of Bellis Perennis L., Nesli̇han Kavalcioğlu, Leyla Açik, Nur Münevver Pinar
Turkish Journal of Botany
Random amplified polymorphic DNA (RAPD) is one of the easiest and most commonly used molecular techniques for genetic variability analysis. In the present study, the genetic diversity of analysis of Bellis perennis L. collected in 4 Turkish geographical locations was investigated by RAPD-PCR analysis. In addition to RAPD, pollen analysis of the 4 plant populations was also conducted. Out of 40 RAPD primers tested, 12 exhibited distinct banding patterns showing 45% to 79% polymorphism. Plants from these 4 localities were almost the same morphologically. Considerable differences were observed in the RAPD profile and pollen shape of plants from the Rize/Dereköy …
A New Species Of Echinops (Asteraceae) From Turkey, Cem Vural, Mustafa Kemal Bi̇ter, Mehmet Yaşar Dadandi
A New Species Of Echinops (Asteraceae) From Turkey, Cem Vural, Mustafa Kemal Bi̇ter, Mehmet Yaşar Dadandi
Turkish Journal of Botany
Echinops dumanii C.Vural is described and illustrated from Adana province, South Anatolia, Turkey. It is considered to be endemic to Turkey. The morphological differences from the closely related species Echinops phaeocephalus Hand.-Mazz. are discussed. The International Union for Conservation of Nature (IUCN) threat category and observations on the ecology of the populations are noted. The geographical distribution of the new species is mapped.
Pollen And Seed Morphology Of The Genus Hesperis L. (Brassicaceae) In Turkey, Münevver Pinar, Ahmet Duran, Tali̇p Çeter, G. Ni̇lhan Tuğ
Pollen And Seed Morphology Of The Genus Hesperis L. (Brassicaceae) In Turkey, Münevver Pinar, Ahmet Duran, Tali̇p Çeter, G. Ni̇lhan Tuğ
Turkish Journal of Botany
Pollen and seed morphology were examined in 35 specimens representing 25 Turkish species of the taxonomically complex genus Hesperis L. by light and scanning electron microscopes. Three main types and 2 subtypes were recognized based on the seed coat surface, pollen shape, and exine sculpturing. The seed coat ornamentation of Type I was ocellate, and pollen shape was oblate-spheroidal. While Type II was represented by reticulate seed coat and prolate-spheroidal pollen shape, Type III had tuberculate seed coat. This study revealed that both palynological and seed morphological characters are of significant importance in the taxonomy of the genus.
Pollen Morphology Of Some Gypsophila L. (Caryophyllaceae) Species And Its Taxonomic Value, Ebru Ataşlar, İsmühan Potoğlu Erkara, Süleyman Tokur
Pollen Morphology Of Some Gypsophila L. (Caryophyllaceae) Species And Its Taxonomic Value, Ebru Ataşlar, İsmühan Potoğlu Erkara, Süleyman Tokur
Turkish Journal of Botany
Pollen morphology of 12 taxa (6 of them endemic) that belong to the genus Gypsophila L. were investigated using light microscopy (LM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Differences in pollen morphology between these taxa were determined based on palynological studies. Pollen grains are spheroidal and polyporate. The exine structure is tectate, but that of G. sphaerocephala var. sphaerocephala is intectate. The exine sculpture is granulate-microechinate-microperforate, but that of G. sphaerocephala var. sphaerocephala displays clavate-microechinate ornamentation. The operculum exists in the form of scattered pieces in G. curvifolia, while it exists as a whole in the other …
The Structure And Ultra Structure Of Anther Epidermis And Pollen In Lagerstroemia Indica L. (Lythraceae) In Response To Air Pollution, Farkhondeh Rezanejad
The Structure And Ultra Structure Of Anther Epidermis And Pollen In Lagerstroemia Indica L. (Lythraceae) In Response To Air Pollution, Farkhondeh Rezanejad
Turkish Journal of Botany
The structure of the anthers and pollen of Lagerstroemia indica L. (crepe myrtles) (Lythraceae) in samples collected from clean and polluted areas was studied by OM, SEM, and TEM. The epidermal cells of the anthers enlarged during anther development. Their cuticle content increased and became thick and folded. The cytoplasm of epidermal cells was peripheral and degenerated in mature anthers. At this time, their major content was phenolic compounds. The epidermal cells in the anthers collected from polluted areas were shrunken, fragile, and burned at the tip, compared to those collected from non-polluted areas. Flavonoid stainability was greater in the …
Inflorescence Architecture And Floral Morphology Of Aratitiyopea Lopezii (Xyridaceae), Lisa M. Campbell, Dennis Wm. Stevenson
Inflorescence Architecture And Floral Morphology Of Aratitiyopea Lopezii (Xyridaceae), Lisa M. Campbell, Dennis Wm. Stevenson
Aliso: A Journal of Systematic and Floristic Botany
Aratitiyopea lopezii is a robust perennial species of Xyridaceae from seasonally saturated, mid- to high-elevation, sandstone and granite sites in northern South America. The species lacks the scapose inflorescence characteristic of Xyridaceae and, having the gestalt of a rhizomatous bromeliad, it is seemingly aberrant in the family. However, closer examination confirms features consistent with the family and the previously noted morphological similarities to Orectanthe. Details of inflorescence structure and floral morphology are presented and compared to other genera of Xyridaceae.
The Operculum In Pollen Of Monocotyledons, Carol A. Furness, Paula J. Rudall
The Operculum In Pollen Of Monocotyledons, Carol A. Furness, Paula J. Rudall
Aliso: A Journal of Systematic and Floristic Botany
Within monocotyledons, monosulcate pollen is the predominant type and probably represents the plesiomorphic condition, but considerable variation occurs in sulcus morphology. An operculum is an exine thickening that covers most of an aperture. Monocot opercula are usually associated with sulci, although they can occur in ulcerate apertures, as in Poaceae. There are several other aperture types closely related to the monosulcate-operculate type, and confusion occurs in the palynological literature between monosulcate-operculate, pontoperculate, disulculate, disulcate, and zona-aperturate (zonasulculate or zonasulcate) pollen. Transmission electron microscopy (TEM) was used to determine the distribution of the thick apertural intine and to accurately identify these …
Aperture Pattern And Microsporogenesis In Asparagales, Sophie Nadot, Laurent Penet, Leanne D. Dreyer, Arlette Forchioni, Adrienne Ressayre
Aperture Pattern And Microsporogenesis In Asparagales, Sophie Nadot, Laurent Penet, Leanne D. Dreyer, Arlette Forchioni, Adrienne Ressayre
Aliso: A Journal of Systematic and Floristic Botany
The aperture pattern of pollen grains is a character defined as the number, shape, and position of apertures. Although this character is highly variable in angiosperms, two states are particularly widespread. Pollen grains with one polar aperture occur frequently in basal angiosperms and monocots while tricolpate pollen is a synapomorphy of the eudicots. Many morphological characters are the result of a compromise between selective forces (acting on morphology) and developmental constraints (limiting the range of possible morphologies). To investigate what are the respective roles of development and selection in the determination of aperture pattern in angiosperms, we have chosen to …
Morphological And Palynological Investigation On Silene Gigantea L. Var. Gigantea And Silene Behen L. (Caryophyllaceae) Distributed In Western Anatolia And Northern Cyprus, Kemal Yildiz
Turkish Journal of Botany
A comparative investigation was carried out on the morphology and palynology of Silene gigantea L. var. gigantea and Silene behen L. species of the family Caryophyllaceae distributed in Western Anatolia and Northern Cyprus. An examination conducted on S. gigantea var. gigantea revealed that the calyx length in Western Anatolian specimens was shorter than that of those from Northern Cyprus, that the basal petal blades of the Western Anatolian specimens did not have any ligula while those from Northern Cyprus did, and that the petal blades belonging to the specimens from Northern Cyprus demonstrated less clefting as compared to those from …
The Anatomical And Palynological Properties Of Alyssum Obtusifolium Steven Ex Dc. (Brassicaceae), Nermi̇n Orcan, Riza Bi̇nzet
The Anatomical And Palynological Properties Of Alyssum Obtusifolium Steven Ex Dc. (Brassicaceae), Nermi̇n Orcan, Riza Bi̇nzet
Turkish Journal of Botany
Alyssum obtusifolium Steven ex DC. was explored in terms of its anatomical and palynological aspects. The root is perennial and it has alternating concentric zones of xylem with large and small vessels respectively. The number of vascular bundles is 13-15 in the stem. The leaves are isolateral and have stomata cells which are anisocytic. Both surfaces of the leaves are covered with stellate hairs. The pollen type of the specimens is tricolpate.
In Vitro Pollen Germination And Pollen Tube Characteristics In Tetraploid Red Clover (Trifolium Pratense L., H. Nurhan Büyükkartal
In Vitro Pollen Germination And Pollen Tube Characteristics In Tetraploid Red Clover (Trifolium Pratense L., H. Nurhan Büyükkartal
Turkish Journal of Botany
The morphological characteristics, fertility and in vitro germination of natural tetraploid red clover (Trifolium pratense L.) pollen were examined as well as the characteristics of pollen tubes and callose formation. Pollen grains of red clover are tricolporate and usually the germination of pollen is monosphonic. Among the pollen tubes that were formed under in vitro conditions, in addition to those that went through the normal growth process, poorly or non-grown pollen tubes were also observed. In addition, some abnormalities in the form of callose deposition were observed in the pollen tubes.
Adaptability Of Scanning Electron Microscopy To Studies Of Pollen Morphology, John J. Skvarla, John R. Rowley, William F. Chissoe
Adaptability Of Scanning Electron Microscopy To Studies Of Pollen Morphology, John J. Skvarla, John R. Rowley, William F. Chissoe
Aliso: A Journal of Systematic and Floristic Botany
We have explored methods to achieve excellent results in study of the pollen grain wall by using only one electron microscope, the scanning electron microscope (SEM). While the secondary electron imaging mode, the most common in use, has great value in characterizing the exine surface it is possible to obtain a more comprehensive representation of pollen grain walls by expanding the capability of the secondary mode and making use of backscatter and transmission imaging detectors. In this way information is obtained about internal exine features that are likely to be more stable phylogenetically than the generally late-to-form surface structure. We …
Pollen Of The Myricaceae - A Preliminary Report, Marshall D. Sundberg
Pollen Of The Myricaceae - A Preliminary Report, Marshall D. Sundberg
Journal of the Minnesota Academy of Science
Pollen of 16 species and one variety of the Myricaceae was examined, including members of each of the genera proposed by Chevalier (1901) in addition to Canacomyrica (Guillaumin, 1939). Comparison of pollen characters within genera, within sections, between sections, and between genera suggests that the Myricaceae can be divided into four genera: Canacomyrica; Comptonia; Gale; and Myrica. The genus Myrica can be further divided into three sections; Cerophora, Fava, and Morella.