Pollen Morphology in the Subtribe Metrosiderinae of the Leptospermoideae (Myrtaceae) and Its Taxonomic Significance.

1981 ◽  
Vol 29 (2) ◽  
pp. 159 ◽  
Author(s):  
PA Gadek ◽  
HA Martin
Keyword(s):  
Pollen Morphology ◽  
Intraspecific Variability ◽  
Interspecific Variation ◽  
Pollen Grain ◽  
Species Level ◽  
Taxonomic Significance ◽  
Pollen Type ◽  
Interspecific Variability ◽  
Pollen Characters ◽  
Definition Of

The pollen morphology of 28 species from the subtribe Metrosiderinae (s.Bentham) is described and compared in the light of several recent taxonomic revisions of this subtribe. All species have the same basic Myrtaceous pollen type, but there is intra and interspecific variability seen in a number of the pollen characters. Intraspecific variability is related either to changes in volume and size of the pollen grain or to the occurrence of polar islands. It is concluded that the character of syncolpy or parasyncolpy as relating to the presence or absence of polar islands may not be taxonomically reliable at the species level. Interspecific variation. and thus those characters most useful in assessing the taxonomy, relate to the structure of the angle of the amb, the exine structure and sculpture and the definition, form and type of colpi and apocolpia. One species shows a difference in polarity from the rest. Three basic exine sculpture types were defined, but it was necessary to examine them under the scanning electron microscope (SEM) because their patterns could not be resolved under the light microscope. Acetolysis enhanced the definition of the smaller basic sculptures under the SEM. Generally, the pollen morphology of these species was found to support the recent taxonomic revisions of this subtribe.

scholarly journals Pollen characters as taxonomic evidence in some species of Dipsacaceae from Iran

2017 ◽  
Vol 24 (2) ◽  
pp. 129-136 ◽  
Author(s):  
Ebadi-Nahari Mostafa ◽  
Nikzat-Siahkolaee Sedigheh ◽  
Eftekharian Rosa
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Pollen Grain ◽  
Pollen Type ◽  
Upgma Tree ◽  
Pollen Characters ◽  
Exine Ornamentation ◽  
The Family ◽  
The World ◽  
Plant Taxon

Pollen morphology of nine species representing four genera: Cephalaria Schrad, Dipsacus L., Pterocephalus Vaill. and Scabiosa L. of the family Dipsacaceae in Iran has been investigated by means of scanning electron microscopy (SEM). The results showed that pollen grains were triporate and tricolpate. The pollen type of Scabiosa rotata Bieb. (tri- and tetraporate) is the first report in the world. The sizes of pollen grains fall into the classification group magna (pollen grain diameter 50–100 μm). Pollen shapes vary from preoblate to prolate and their polar views were triangulate and lobate. The exine ornamentation varies from gemmate in S. rotata to spinulate in the rest studied species. Species of Scabiosa have been dispersed in UPGMA tree that this confirmed the previous studies about taxonomic problems and species complexity in this genus. These results show the transfer of the some Scabisoa species to Lomelosia Raf. based on palynological characters. Pollen morphology of the family is helpful at the generic and specific level.Bangladesh J. Plant Taxon. 24(2): 129–136, 2017 (December)

Seed and pollen morphology in the Orobanche alsatica complex (Orobanchaceae) from central Europe and its taxonomic significance

2014 ◽  
Vol 27 (2) ◽  
pp. 145 ◽  
Author(s):  
R. Piwowarczyk ◽  
A. T. Halamski ◽  
E. Durska
Keyword(s):  
Czech Republic ◽  
Pollen Morphology ◽  
Species Level ◽  
Strongly Correlated ◽  
Taxonomic Character ◽  
Taxonomic Significance ◽  
Seed Shape ◽  
Central European ◽  
Pollen Characters ◽  
Wall Perforation

Micromorphology of seeds and pollen of Orobanche alsatica, O. bartlingii and O. mayeri, the central European representatives of the O. alsatica aggregate (Orobanchaceae) was investigated on the basis of 32 samples from 18 localities in Poland, Slovakia, Czech Republic, Austria, Bosnia and Herzegovina, and Russia. Concerning seeds, the best taxonomic character is a narrow trough on external sides of radial walls of cells of the seed wall, which is always present and continuous in O. bartlingii, mostly absent in O. mayeri, and mostly present solely at wall segment junctions (vertices) in O. alsatica (individuals parasitising Peucedanum spp.; continuous in parasites of Seseli osseum). As for pollen, the exine sculpture is verrucate in O. mayeri, granulate in O. bartlingii, and granulate to scabrate in O. alsatica. O. alsatica parasitising Peucedanum spp. and Seseli osseum (host-related morphotypes) differ in seed shape, ornamentation and wall-perforation diameter. Variability of seed and pollen characters is high, and identical morphologies occur among the investigated species. The variation coefficient is too strongly correlated with the sample size to be a reliable estimator the taxonomic value of a character. Differences in seed and pollen sculpture, hosts and ecological preferences confirm the separation of the three examined taxa at species level.

Sporoderm morphogenesis in Euphorbia obesa and Croton gratissimus

Bothalia ◽  
1983 ◽  
Vol 14 (3/4) ◽  
pp. 849-856 ◽  
Author(s):  
M. L. Frean
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Physiological Adaptation ◽  
Structure Characteristic ◽  
Pollen Type ◽  
Electron Microscope Level ◽  
Pollen Characters ◽  
Pollen Types ◽  
Unisexual Flowers ◽  
Taxonomic Grouping

Pollen grains of the Euphorbiaceae show a number of pollen types which can be clearly distinguished. Generally different genera are characterized by a specific pollen type.  Euphorbia obesa Hook. f. and Croton gratissimus Burch, subsp.  subgratissimus (Prain) Burtt Davy, represent two genera within the Crotonoideae with different morphology, each type characteristic for the respective genus. Taxonomically, the genus Euphorbia with apetalous flowers consisting of a naked pistil surrounded by several staminate flowers within a cyathium, is considered more advanced than the genus  Croton. In  Croton the inflorescence is a raceme with unisexual flowers. The floral whorls of the male show numerous anthers and both calyx and a showy corolla are present. Both genera are insect pollinated. In both  Euphorbia obesa and  Croton gratissimus the pollen wall in section shows columellae, a structure characteristic of angiosperms. However the present ontogenetic studies show that the formation of the columellae differs entirely in the two pollen types. The final stratification of the wall as well as the morphology of the grains differ and evaluation of the exine structure indicates that phylogenetically Croton pollen shows more advanced characters than  Euphorbia — contradicting the floral phylogeny. This study conducted at light and electron microscope level compares the two pollen types morphologically and ontogenetically, concentrating mainly on the formation of the exine which is tectate-perforate in the prolate tricolpate grain of Euphorbia obesa and semi-tectate in the anaperturate, spheroidal grain of Croton gratissimus. The aim of the study was to evaluate the significance of pollen characters in taxonomic and phylogenetic relationships within the Euphorbiaceae. The differing pollen morphology which is related to the taxonomic grouping of tribes within the subfamily (Crotonoideae) emphasizes diversity, which may result from physiological adaptation. The study shows that the same functional end may well be achieved in different ways and this may be a factor underlying the diversity in the heterogeneous family Euphorbiaceae.

scholarly journals Taxonomic significance of palynomorphological characteristics of selected Centranthus (Caprifoliaceae) species

Hacquetia ◽  
2021 ◽  
Vol 20 (2) ◽  
pp. 243-256
Author(s):  
Zoya M. Tsymbalyuk ◽  
Daniella Ivanova ◽  
Lyudmila M. Nitsenko
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Species Level ◽  
Herbarium Specimens ◽  
Taxonomic Significance ◽  
Specific Identification ◽  
Medium Length ◽  
Exine Sculpture ◽  
Species Specific ◽  
First Time

Abstract Pollen morphology of herbarium specimens of four Centranthus species (C. ruber, C. longiflorus, C. kellereri and C. calcitrapae) was studied using LM and SEM. The research aim was to provide data on their pollen characteristics and to evaluate the taxonomic value of these data for species-specific identification. Pollen grains are tricolpate, suboblate to prolate (P/E = 0.81–1.42); medium- or large-sized (P = 49.21–90.44 µm; E = 43.89–93.10 µm). Colpi are long or medium-length, wide at equator, tapered to acute or obtuse ends. Exine sculpture is echinatemicroechinate-nanoechinate; echini (1.00–1.39 µm high) and microechini (0.55–0.98 µm) are conical, with straight or convex sides and acute apices, nanoechini are 0.22–0.46 µm high. Most important characters of taxa diagnostic at species level for the taxonomy are: size of pollen and colpi, exine structure, size of echini and microechini, and pattern of tectum in areas between echini. Pollen grains of C. calcitrapae and C. macrosiphon (sect. Calcitrapa) are generally smaller in size than grains of C. ruber, C. longiflorus and C. kellereri (sect. Centranthus). Pollen of C. kellereri was analysed for the first time in the current study.

Pollen Morphology and Taxonomic Significance of Chinese Morus L.

2014 ◽  
Vol 618 ◽  
pp. 344-348
Author(s):  
Ling Liu ◽  
Xi Tong Shen ◽  
Xiang Ping Chen ◽  
Xiao Min Fan ◽  
Ren Fang Chen
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Species Level ◽  
Morus Alba ◽  
Pollen Size ◽  
Aperture Size ◽  
Taxonomic Significance ◽  
Initial Forms ◽  
Scanning Electron

Study the Chinese Morus from the aspect of pollen morphology of 25 Chinese Morus plants of 10 species and 1 variety were observed using scanning electron microscopy (SEM). Results showed the differences to be mainly in pollen size, aperture size, P/E value and columellae structure.Supported the conclusion thatMorus bombycisis a species level unit butMorus mizuho,Morus atropurpurea, andMorus multicaulisare not, the conclusion thatMorus atropurpurea,Morus multicaulis, Morus alba, andMorus macrouraare initial forms, and thatMorus mongolica, Morus mongolicavar. diabolica, Morus bombycis, andMorus australisare later forms.

scholarly journals Taxonomical Investigation on Some Species of Genus Allium Based on the Pollen Morphology

2019 ◽  
pp. 1-10
Author(s):  
Mehdi Heidarian ◽  
Seyed Mohammad Mehdi Hamdi ◽  
Mohammad Mehdi Dehshiri ◽  
Taher Nejadsattari ◽  
Seyed Mohammad Masoumi
Keyword(s):  
Electron Microscopy ◽  
Pollen Morphology ◽  
Numerical Taxonomy ◽  
Morphological Characteristics ◽  
Pollen Grains ◽  
Pollen Grain ◽  
Wall Structure ◽  
Transmission Electron ◽  
Pollen Characters ◽  
Exine Ornamentation

Aims: The aim of this research was to investigate the morphological characteristics of the pollen grain of some species of genus Allium. Methodology: The pollen grains were examined by using Light Microscopy (LM), Scanning Electron Microscopy (SEM) and the pollen grains of one species under Transmission Electron Microscopy (TEM). Results: The pollen grains were oblate and medium in shape and size. The pollen ornamentation of exine surface, exine ornamentation on sulcus edge, lumina number in the exine surface and the state of pollen grain apex in the examined species were different. Semitectate and columellate ectexine with discontinuous endexine were seen in the pollen wall structure (sporoderm). The dendrogram obtained from the pollen characters in SEM observations by using the numerical taxonomy system (NTSYS) software placed the studied species in two types. Conclusion: Our palynological dendrogram can be used for segregation the sections and subgenera taxonomical levels in the studied species of genus Allium and confirmed the phylogram of the recent phylogenetic research.

The systematic value of pollen morphology of Passiflora subgenus Astrophea (Passifloraceae)

Phytotaxa ◽  
2017 ◽  
Vol 298 (1) ◽  
pp. 1 ◽  
Author(s):  
ANA CAROLINA MEZZONATO-PIRES ◽  
CLÁUDIA BARBIERI FERREIRA MENDONÇA ◽  
MICHAELE ALVIM MILWARD-DE-AZEVEDO ◽  
VANIA GONÇALVES-ESTEVES
Keyword(s):  
Great Degree ◽  
Pollen Morphology ◽  
Multivariate Analyses ◽  
Type I ◽  
Pollen Type ◽  
Type Iv ◽  
Quantitative Characters ◽  
Pollen Characters ◽  
Pollen Types ◽  
Degree Of Similarity

This study investigates and reports the pollen morphology of a selected group of Passiflora species of the subgenus Astrophea. We found that species can be grouped into five pollen types, four of which had been previously documented. The fifth new pollen type was observed in P. macrophylla. This pollen type completely lacks muri, and possesses spines and bacula on a granulate surface. All of the species of the subgenus Astrophea studied have the same type of aperture: 6-colporate with 3 lalongate endoapertures, one for each pair of ectoapertures. Multivariate analyses performed with quantitative characters showed a great degree of similarity between type I, II and V pollen, and individual distinction of type III and type IV. The pollen characters observed do not support the currently accepted taxonomic classification for the Passiflora subgenus Astrophea, but are useful for delimiting species.

scholarly journals Systematic relevance of pollen morphology in tribe Hylocereeae (Cactaceae)

PhytoKeys ◽  
2019 ◽  
Vol 128 ◽  
pp. 121-140 ◽  
Author(s):  
Catalina Ruiz-Domínguez ◽  
Andrew P. Vovides ◽  
Victoria Sosa
Keyword(s):  
Light Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Polar View ◽  
Pollen Grain ◽  
Area Index ◽  
Oblate Spheroidal ◽  
Representative Species ◽  
Pollen Characters ◽  
Polar Area

Hylocereeae is one of the nine tribes in the subfamily Cactoideae (Cactaceae), for which the limits and recognition of genera have been controversial. Essentially, this group comprises epiphytic and hemiepiphytic genera with stems modified as climbing structures. The aim of this paper is to examine pollen attributes in representative species of genera of Hylocereeae, focusing on Selenicereus whose current circumscription comprises Hylocereus and three Weberocereus species, to find whether significant potentially apomorphic and/or autapomorphic systematic characters can be discovered. Utilizing SEM and light microscopy, 25 pollen characters were observed and measured. Tribe Hylocereeae is stenopalynous, with pollen grains isopolar and radially symmetrical monads, mostly tricolpate, except in Kimnachia, Pseudoripsalis and Weberocereus, whose pollen grains are pantocolpate. Seven attributes (five qualitative and two continuous) exhibited useful variation and were coded. The character of brevicolpate pollen grains was shared by Kimnachia ramulosa and Pseudorhipsalis amazonica. Convex quadrangular outline in the polar view was shared by Weberocereus tunilla and S. glaber. The absence of spinules on the exine was shared by S. minutiflorus and S. stenopterus. The largest pollen grain, found in Selenicereus megalanthus, might be correlated with polyploidy. Selenicereus is the taxon with the highest variation in pollen attributes, including species with an exine with or without spinules and variable polar area index and shape (subprolate or oblate-spheroidal).

Interspecific and intraspecific variation in pollen morphology in four species of Salix

1990 ◽  
Vol 68 (7) ◽  
pp. 1497-1501 ◽  
Author(s):  
K. H. Kim ◽  
L. Zsuffa ◽  
A. Kenney ◽  
A. Mosseler
Keyword(s):  
Intraspecific Variation ◽  
Pollen Morphology ◽  
Polar Axis ◽  
Interspecific Variation ◽  
Pollen Grain ◽  
Equatorial Diameter ◽  
Specific Variation ◽  
Axis Length ◽  
Interspecific And Intraspecific Variation ◽  
Morphology Parameters

A study of inter- and intra-specific variation in pollen grain polar axis length, pollen equatorial diameter, colpus length, and colpus width in Salix discolor, S. eriocephala, S. lucida, and S. petiolaris demonstrated significant interspecific variation, unequal distances between the species, and various degrees of intraspecific variation. The taxonomic value of the pollen morphology parameters measured was found to vary according to species. A relationship between the pollen parameters measured to the ploidy level of the species is hypothesized. Key words: Salix, pollen, taxonomy.

Comparative pollen morphology of Turkish species of Petrorhagia (Caryophyllaceae) and its systematic implications

Biologia ◽  
2010 ◽  
Vol 65 (3) ◽  
Author(s):  
Kamuran Aktaş ◽  
Yasin Altan ◽  
Canan Özdemir ◽  
Pelin Baran ◽  
Teresa Garnatje
Keyword(s):  
Pollen Morphology ◽  
Pore Diameter ◽  
Pollen Grain ◽  
Pollen Type ◽  
Scanning Electron ◽  
Grain Diameter

AbstractPollen morphology of 10 taxa from Turkey, four of them endemic, belonging to the genus Petrorhagia (Caryophyllaceae), P. alpina subsp. alpina, P. alpina subsp. olympica, P. cretica, P. dubia, P. hispidula, P. lycica, P. pamphylica, P. peroninii, P. prolifera and P. saxifraga, has been investigated using light (LM) and scanning electron (SEM) microscopy. Pollen morphology differences among these taxa have been determined. The pollen type of investigated taxa is polyporate (12–22-porate), sphaeroidal, the exine exhibits a tectate structure and a microechinate ornamentation. Petrorhagia alpina subsp. alpina has the smallest pollen grain diameter (18.57 μm) and P. dubia the largest one (37.80 μm). The number of pores ranges from 12 (in P. dubia and P. saxifraga) to 22 (in P. alpina subsp. alpina and P. alpina subsp. olympica and P. hispidula) with a minimum pore diameter of 2.37 μm in P. alpina subsp. alpina and a maximum pore diameter of 4.23 μm in P. peroninii. The exine thickness ranges from 1.73 μm in P. saxifraga to 3.78 μm in P. pamphylica. In this study, the systematic implications are discussed in the light of palynological results.

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