Triploidy in the genus Antennaria (Asteraceae: Inuleae)

1984 ◽  
Vol 26 (2) ◽  
pp. 133-136 ◽  
Author(s):  
C. C. Chinnappa
Keyword(s):  
Chromosome Numbers ◽  
Western Canada ◽  
Naturally Occurring ◽  
First Time ◽  
Antennaria Microphylla

Chromosome numbers for individuals from 87 populations of Antennaria from western Canada were counted. Naturally occurring triploid (2n = 42) hybrid populations between diploid (2n = 28) Antennaria microphylla Rydb. and two tetraploid (2n = 56) species Antennaria rosea Greene and Antennaria umbrinella Rydb. are reported for the first time. With the discovery of the triploid populations, an entire euploid series (2x–8x) has been established for the genus Antennaria.Key words: polyploidy, Antennaria, hybridization, agamospermy, taxonomy.

CHROMOSOME NUMBERS OF SOME WESTERN CANADIAN PLANTS

1966 ◽  
Vol 44 (8) ◽  
pp. 1093-1103 ◽  
Author(s):  
Roy L. Taylor ◽  
Ronald P. Brockman
Keyword(s):  
Chromosome Numbers ◽  
Western Canada ◽  
First Time

Chromosome numbers are presented for 97 taxa of western Canada. A total of 33 are reported for the first time, and of these, the chromosome numbers given for Xerophyllum(Liliaceae), n = 15, Menziesia (Ericaceae), n = 13, and Physostegia (Labiatae), n = 19, are the first for these genera. A brief discussion is given for a few of the taxa.

A taxonomic revision of Brachychiton (Sterculiaceae)

1988 ◽  
Vol 1 (3) ◽  
pp. 199 ◽  
Author(s):  
GP Guymer
Keyword(s):  
Chromosome Numbers ◽  
Conservation Status ◽  
Taxonomic Revision ◽  
Sympatric Species ◽  
Herbarium Specimens ◽  
New Combinations ◽  
Separate Genus ◽  
Naturally Occurring ◽  
First Time ◽  
Seed Coats

Brachychiton Schott & Endl. has previously been included under Sterculia and its generic status has been uncertain. Characters of the follicles, seed coats and embryo strongly support the retention of Brachychiton as a separate genus. The genus comprises five sections, including one new section, Oxystele Guymer. Characters useful in identification and classification are reassessed and those found to be of most significance are described in detail and illustrated. Chromosome numbers of 2n = 40 for 12 species are recorded for the first time. Keys for the identification of taxa are given. Detailed new descriptions, distribution (including a map based on herbarium specimens), ecology, conservation status and relationship are provided for each taxon, and most taxa are illustrated. Taxa described as new are: B. acuminatus, B. albidus, B. chillagoensis, B. collinus, B. compactus, B. diversifolius subsp. orientalis, B. fitzgeraldianus, B. grandiflorus, B. megaphyllus, B. muellerianus, B. multicaulis, B. obtusilobus, B. populneus subsp. trilobus, B. spectabilis, B. tridentatus and B. xanthophyllus. The following five new combinations are made: B. garrawayae (Bailey) Guymer, B. tuberculatus (W. Fitzg.) Guymer, B. viridiflorus (W. Fitzg.) Guymer, B. viscidulus (W. Fitzg.) Guymer and B. vitifolius (Bailey) Guymer. Naturally occurring hybrids within the genus are frequent between partially sympatric species. Eight hybrids are recorded and described: B. x allochrous, B. x carneus, B. x excellens, B. x hirtellus, B. x incarnatus, B. x roseus, B. x turgidulus and B. x vinicolor.

scholarly journals Morphological, Anatomical and Cytological Studies of some Moss Species from Nigeria

2017 ◽  
Vol 9 (3) ◽  
pp. 404-413
Author(s):  
Abolade Oluremi BOLAJI ◽  
Julius Olaoye FALUYI
Keyword(s):  
Chromosome Numbers ◽  
Taxonomic Status ◽  
Knowledge Gaps ◽  
Moss Species ◽  
Anatomical Studies ◽  
First Time

Morphological, anatomical and chromosome studies of Hyophila crenulata C, Mull. Ex Dus, Thuidium gratum (P. Beauv) Jaeg., Barbula lambarenensis P. Vard.. Stereophyllum nitense Mitt. and Bryum coronatum Schwaegr from Nigeria, were carried out with a view to bridging some knowledge gaps that exist in their characterization and providing insightful information that could be useful in elucidating their taxonomic status. The morphological and anatomical studies revealed several gametophytic and sporophytic attributes which have not been previously reported and which were diagnostic for the moss species studied. The chromosome studies revealed the chromosome numbers to be Hyophila crenulata n = 4; Thuidium gratum n = 12 (10 + 2 m); Barbula lambarenensis n = 3; Stereophyllum nitense n = 9; and Bryum coronatum n = 10. The study concluded that the details of the morphological and anatomical descriptions as well as the chromosome numbers being reported for the first time in this study for the moss species studied could be very useful in their identification and taxonomic delimitation.

scholarly journals New Contribution to the Knowledge on the Chromosome Numbers of Turkish Cerambycidae (Coleoptera)

2021 ◽  
Vol 69 (2) ◽  
pp. 93-99
Author(s):  
Yavuz Koçak ◽  
Elmas Yağmur
Keyword(s):  
Chromosome Number ◽  
Sex Determination ◽  
Chromosome Numbers ◽  
Chromosome Count ◽  
Chromosomal Number ◽  
The Poor ◽  
Karyological Data ◽  
First Time

Information on the karyotypes of Turkish species of Cerambycidae is scanty. Our study contributes to the knowledge of the karyological data (chromosomal number and mechanism of sex determination) of five Turkish longicorn beetles; karyotypes of four taxa, one endemic, are described for the first time and for the remaining one, Purpuricenus budensis (Götz, 1783), the previously published chromosome count is confirmed. The chromosome number of Purpuricenus desfontainii inhumeralis Pic, 1891 and Purpuricenus budensis (Götz, 1783) (Cerambycinae, Trachyderini) was found to be 2n = 28 (13 + Xyp); Clytus rhamni Germar, 1817 and Plagionotus floralis (Pallas, 1773) (Cerambycinae, Clytini) 2n = 20 (9 + Xyp); and the endemic Dorcadion triste phrygicum Peks, 1993 (Lamiinae, Dorcadionini) 2n = 24 (11 + Xyp). In view of the paucity of data available until now, our study is important for both to improve the poor karyological knowledge of Turkish Cerambycidae and to provide an incentive for other researchers.

scholarly journals Microbialite-like structures in Cladophora sp. (Ulvophyceae) mats from a subtropical Andean basin: ecological implications

2019 ◽  
Vol 67 (1) ◽  
Author(s):  
Hugo R. Fernández ◽  
Ana Lucia Gonzalez Achem ◽  
Marcela Correa ◽  
Virginia H. Albarracín
Keyword(s):  
Organic Pollution ◽  
Biological Factors ◽  
X Ray Diffraction ◽  
Calcite Precipitation ◽  
Annual Cycles ◽  
X Ray ◽  
Naturally Occurring ◽  
Ecological Implications ◽  
First Time ◽  
Solubility Equilibrium

The solubility equilibrium of calcite is influenced by physicochemical, climatic and biological factors. Annual cycles of exceptionally prolonged drought, in conjunction with naturally occurring diffuse organic pollution, generate the unique conditions for the precipitation of lithified carbonate structures (microbialites). The aim of this article is to analyze the possible implications of calcite precipitation produced in mats of Cladophora sp. in an Andean subtropical basin, considering it is the first time this phenomenon is described for the region. We collected samples from selected sites at the Lules River Basin, in four sampling dates between the years 2003 and 2004, within a monitoring work of 15 years. Samples were analyzed using an electron microscope and X-ray diffraction analysis. We found that Gomphonema sp. attached to Cladophora sp. contributes to precipitation of calcite and formation of microbialite like structures, in the studied area. This work presents an initial discussion of the discovery of microbialites-like structures attached to Cladophora sp. mats in a subtropical Andean stream and the environmental conditions that lead to their production, as well as the possible ecological implications of these microbialites.

Chromosome studies on African plants. 9. Chromosome numbers in Ehrharta (Poaceae: Ehrharteae)

Bothalia ◽  
1989 ◽  
Vol 19 (1) ◽  
pp. 125-132 ◽  
Author(s):  
J. J. Spies ◽  
E. J. L. Saayman ◽  
S. P. Voges ◽  
G. Davidse
Keyword(s):  
Chromosome Number ◽  
Ploidy Level ◽  
Chromosome Numbers ◽  
Basic Chromosome Number ◽  
B Chromosomes ◽  
Basic Chromosome ◽  
Cytogenetic Studies ◽  
African Plants ◽  
First Time

Cytogenetic studies of 53 specimens of 14 species of the genus  Ehrharta Thunb. confirmed a basic chromosome number of 12 for the genus. Chromosome numbers for 13 species are described for the first time. The highest ploidy level yet observed in the genus (2n = lOx = 120) is reported for E. villosa var.  villosa. B chromosomes were observed in several specimens of four different species.

scholarly journals Pharmacologic Activities¬ of 3’-Hydroxypterostilbene: Cytotoxic, Anti-Oxidant, Anti-Adipogenic, Anti-Inflammatory, Histone Deacetylase and Sirtuin 1 Inhibitory Activity

2015 ◽  
Vol 18 (4) ◽  
pp. 713 ◽  
Author(s):  
Jody K Takemoto ◽  
Connie M. Remsberg ◽  
Neal M. Davies
Keyword(s):  
Histone Deacetylase ◽  
Inhibitory Activity ◽  
Sirtuin 1 ◽  
In Vitro Assays ◽  
Naturally Occurring ◽  
Anti Oxidant ◽  
Anti Inflammatory ◽  
First Time ◽  
Stilbene Compounds

Purpose: Delineate the selected pharmacodynamics of a naturally occurring stilbene 3’-Hydroxypterostilbene. Objective: Characterize for the first time the pharmacodynamics bioactivity in several in-vitro assays with relevant roles in heart disease, inflammation, cancer, and diabetes etiology and pathophysiology. Methods: 3’-Hydroxypterostilbene was studied in in-vitro assays to identify possible bioactivity. Results: 3’-Hydroxypterostilbene demonstrated anti-oxidant, anti-inflammatory, cytotoxic, anti-adipogenic, histone deacetylase, and sirtuin-1 inhibitory activity. Conclusions: The importance of understanding individual stilbene pharmacologic activities were delineated.  Small changes in chemical structure of stilbene compounds result in significant pharmacodynamic differences. This article is open to POST-PUBLICATION REVIEW. Registered readers (see “For Readers”) may comment by clicking on ABSTRACT on the issue’s contents page.

A contribution to the taxonomy of the genus Rhaponticoides (Asteraceae, Cardueae)

Phytotaxa ◽  
2019 ◽  
Vol 422 (1) ◽  
pp. 9-32 ◽  
Author(s):  
KAZEM NEGARESH
Keyword(s):  
Chromosome Numbers ◽  
Full Description ◽  
New Combinations ◽  
First Time

A taxonomic synopsis of the genus Rhaponticoides is presented. Rhaponticoides kultiassovii, R. lasiopoda, R. phyllopoda, R. androssovii, R. gontscharovii, R. alaica, R. modesti, R. ruthenica var. bipinnatifida, R. sect. Vicentinae, R. sect. Africanae, R. sect. Turkestanicae and R. sect. Aralocaspicae are proposed as new combinations. Full description for R. sect. Vicentinae, R. sect. Africanae, R. sect. Turkestanicae and R. sect. Aralocaspicae and a key for all sections are presented for the first time here. My previous descriptions of R. sect. Iranicae and R. sect. Ruthenicae are revised. Two names, R. kultiassovii and R. lasiopoda, are typified. In addition, type details, full descriptions, morphological comparisons, distribution and habitat of transferred taxa are given. Finally, a new list of species of the genus Rhaponticoides with their heterotypic synonyms, geographical distributions and chromosome numbers is provided.

Three new species of Ophryotrocha (Annelida: Dorvilleidae) from a whale-fall in the North-East Atlantic

Zootaxa ◽  
2009 ◽  
Vol 2228 (1) ◽  
pp. 43-56 ◽  
Author(s):  
HELENA WIKLUND ◽  
ADRIAN G. GLOVER ◽  
THOMAS G. DAHLGREN
Keyword(s):  
Phylogenetic Analyses ◽  
Nuclear Gene ◽  
Close Relative ◽  
North East ◽  
The North ◽  
Organic Carbon Flux ◽  
Naturally Occurring ◽  
Three New Species ◽  
First Time ◽  
Complex Organic

Three new Ophryotrocha species are described from sites with high levels of organic carbon flux including a whale-fall at 125 m depth off the Swedish coast and sediment sampled at 104 m depth beneath a fish farm in a Norwegian fjord. Phylogenetic analyses based on the nuclear gene H3 and the mitochondrial genes COI and 16S using MrBayes and Maximum Likelihood analyses show that Ophryotrocha eutrophila sp. nov. is a close relative to Ophryotrocha puerilis, while Ophryotrocha craigsmithi sp. nov. falls together with Palpiphitime lobifera, and Ophryotrocha scutellus sp. nov. occur within the 'hartmanni' clade. The genus Ophryotrocha is in our study monophyletic only if the genera Iphitime and Palpiphitime are included. Two representatives of Ophryotrocha previously described from anthropogenically-enriched sediments are here reported for the first time in very high abundance from a naturally occurring habitat. We suggest that whale falls are important habitats for the evolution of ecosystem services such as the degradation of complex organic compounds.

scholarly journals Effect of Population Density of Pseudomonas fluorescens on Production of 2,4-Diacetylphloroglucinol in the Rhizosphere of Wheat

1999 ◽  
Vol 89 (6) ◽  
pp. 470-475 ◽  
Author(s):  
Jos M. Raaijmakers ◽  
Robert F. Bonsall ◽  
David M. Weller
Keyword(s):  
Biological Control ◽  
Population Density ◽  
Supporting Evidence ◽  
Pseudomonas Spp ◽  
Fluorescent Pseudomonas ◽  
Naturally Occurring ◽  
Rhizosphere Population ◽  
First Time ◽  
Take All

The role of antibiotics in biological control of soilborne pathogens, and more generally in microbial antagonism in natural disease-suppressive soils, often has been questioned because of the indirect nature of the supporting evidence. In this study, a protocol for high pressure liquid chromatography/mass spectrometry is described that allowed specific identification and quantitation of the antibiotic 2,4-diacetylphloroglucinol (Phl) produced by naturally occurring fluorescent Pseudomonas spp. on roots of wheat grown in a soil suppressive to take-all of wheat. These results provide, for the first time, biochemical support for the conclusion of previous work that Phl-producing fluorescent Pseudomonas spp. are key components of the natural biological control that operates in take-all—suppressive soils in Washington State. This study also demonstrates that the total amount of Phl produced on roots of wheat by P. fluorescens strain Q2-87, at densities ranging from approximately 105 to 107 CFU/g of root, is proportional to its rhizosphere population density and that Phl production per population unit is a constant (0.62 ng/105 CFU). Thus, Phl production in the rhizosphere of wheat is strongly related to the ability of the introduced strain to colonize the roots.

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