Cytotaxonomy of Chrysopsis and Heterotheca (Compositae-Astereae): a new interpretation of phylogeny

1977 ◽  
Vol 55 (19) ◽  
pp. 2503-2513 ◽  
Author(s):  
John C. Semple
Keyword(s):  
Chromosome Numbers ◽  
Base Number ◽  
New Interpretation ◽  
First Time

The chromosome numbers for 137 populations of 24 species are reported. First reports of n = 5 are given for Chrysopsis decumbens, C. floridana, C. hyssopifolia, C. lanuginosa. C. latisquamea, and C. scabrella and 2n = 18 for C. cruiseana. The occurrence of the diploid 2n = 8 for C. mariana is also reported for the first time. The base number of Heterotheca is x = 9, while the base numbers of Chrysopsis are x = 4 and 5 and.x2 = 9. A realignment of sections included in the two distinct genera is proposed.

Chromosome numbers and karyotypes in the Australian Gnaphalieae and Plucheeae (Asteraceae)

1999 ◽  
Vol 12 (6) ◽  
pp. 781 ◽  
Author(s):  
K. Watanabe ◽  
P. S. Short ◽  
T. Denda ◽  
N. Konishi ◽  
M. Ito ◽  
...  
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
Base Number ◽  
Generic Delimitation ◽  
First Time

Chromosome number determinations from 152 collections representing 42 genera and 106 species of the Australian Gnaphalieae and Plucheeae are reported. The chromosome numbers of 75 of these species have not been previously counted or differ from those previously reported for species. Chromosome numbers have been documented for the first time for 14 genera: Argyroglottis (n = 12), Cephalosorus (2n = 24), Decazesia (n = 14), Dielitzia (2n = 26), Eriochlamys (n = 14), Erymophyllum (n = 11 and 14), Gilruthia (n = 13), Leucochrysum (n = 9), Myriocephalus s. str. (n = 14, 2n = 24), Polycalymma s. str. (n = 14), Pterocaulon (n = 10), Pterochaeta (n = 12), Quinetia (2n – 24) and Sondottia (2n = 6). Remaining counts augment and agree with previously reported determinations. Some problems with generic delimitation and interpretation of chromosome data are outlined. There is an array of karyotypes within the Australian Gnaphalieae and dysploidy is widespread. Polyploidy has also played an important role in the evolution of some taxa. Evidence suggests that the base number for Australian Gnaphalieae is x = 14. This may be the base number for the entire tribe.

Chromosome numbers of Norfolk Island endemic plants

2003 ◽  
Vol 51 (2) ◽  
pp. 211 ◽  
Author(s):  
P. J. de Lange ◽  
B. G. Murray
Keyword(s):  
Chromosome Numbers ◽  
Vascular Plants ◽  
Oceanic Island ◽  
Base Number ◽  
Endemic Plants ◽  
Island Endemic ◽  
Cytological Feature ◽  
Norfolk Island ◽  
The Common ◽  
First Time

Documented chromosome numbers are reported for the first time for 11 (encompassing 11 genera and families) of the 49 endemic vascular plants from Norfolk Island. Confirmatory counts are provided for the endemic Achyranthes arborescens and Rhopalostylis baueri var. baueri. At least 11 of the taxa counted are probable polyploids, supporting the common cytological feature of oceanic island floras. In addition to these new counts, we also infer a base number of x = 5 for the recently reinstated monogeneric Pennantiaceae and query the generic placement of the two arborescent species of Achyranthes, A. arborescens and A. margaretarum.

CHROMOSOME NUMBERS OF THE FAMILY CRUCIFERAE. I

1964 ◽  
Vol 42 (11) ◽  
pp. 1509-1520 ◽  
Author(s):  
Gerald A. Mulligan
Keyword(s):  
North America ◽  
Chromosome Numbers ◽  
Base Number ◽  
Thellungiella Salsuginea ◽  
The Family ◽  
Cakile Edentula ◽  
First Time

Chromosome numbers are given for 69 collections of 24 species of Cruciferae in the genera Alyssum, Arabidopsis, Arabis, Barbarea, Cakile, Eutrema, Hali-molobos, Nasturtium, Rorippa, Thellungiella, and Turritis. The following chromosome numbers are reported for the first time: Alyssum desertorum, n = 16; Arabis canadensis, 2n = 14; A. divaricarpa, 2n = 13 + 2B, 14, 20 + 2B, 21, 28; A. drummondii, 2n = 20; A. holboellii, 2n = 13 + 2B, 20 + 2B; A. lemmonii, 2n = 14; A. lyallii, 2n = 21; A. lyrata, 2n = 32; A. pendulocarpa, 2n = 14; Barbarea orthoceras, 2n = 16; Cakile edentula, 2n = 18; Rorippa curvisiliqua, 2n = 16; Thellungiella salsuginea, 2n = 14. It is concluded that species of Arabis native to North America and western Greenland have the base number x = 7 and many of them are apomictic whereas Eurasiatic species of this genus have an x = 8 base number and are sexual.

Chromosome numbers and the taxonomy of North American Agalinis (Scrophulariaceae)

1984 ◽  
Vol 62 (3) ◽  
pp. 454-456 ◽  
Author(s):  
Judith M. Canne
Keyword(s):  
Chromosome Number ◽  
North American ◽  
Chromosome Numbers ◽  
Base Number ◽  
Chromosome Counts ◽  
Base Chromosome Number ◽  
First Time

Chromosome counts are provided for 25 populations representing 18 species of Agalinis Raf. Chromosome numbers are reported for the first time for A. pinetorum, A. laxa, A. acuta, A. gattingeri, and A. skinneriana. The base chromosome number for section Linifoliae, section Heterophyllae, section Purpureae subsections Purpureae and Setaceae, and section Tenuifoliae is established at x = 14. Section Erectae and section Purpureae subsection Pedunculares have a base number of x = 13.

CHROMOSOME NUMBERS OF THE FAMILY CRUCIFERAE. II

1965 ◽  
Vol 43 (6) ◽  
pp. 657-668 ◽  
Author(s):  
Gerald A. Mulligan
Keyword(s):  
North American ◽  
Chromosome Numbers ◽  
North American Species ◽  
Base Number ◽  
The Family ◽  
First Time

Chromosome numbers and taxonomic discussions are given for North American material of species in the genera Braya and Cardamine. The following chromosome numbers are reported for the first time: Braya humilis s.l., n = 14 and 2n = 28; Cardamine angulata, n = 20, and 2n = 40; C. cordifolia, 2n = 24; C. microphylla, 2n = 32; C. occidentalis, n = 32 and 2n = 64; C. oligosperma, 2n = 16; C. pensylvanica, 2n = 64; C. umbellata, n = 24 and 2n = 48. It is concluded that the base number of Braya is x = 7 not x = 8 and that North American species of Cardamine have the base numbers x = 6, 8, and 10.

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.

CYTOTAXONOMY, PHYLOGENY, AND CANADIAN DISTRIBUTION OF CIRSIUM UNDULATUM AND CIRSIUM FLODMANII

1961 ◽  
Vol 39 (1) ◽  
pp. 21-33 ◽  
Author(s):  
C. Frankton ◽  
R. J. Moore
Keyword(s):  
North American ◽  
Chromosome Numbers ◽  
World Wide ◽  
North American Species ◽  
Base Number ◽  
Total Length ◽  
The World ◽  
Cirsium Undulatum

The morphology and specific differences of Cirsium undulatum (Nutt.) Spreng. and of C. flodmanii (Rydb.) Arthur are described and their Canadian distributions are reported in detail. The chromosome numbers are C. undulatum f. undulatum and f. album Farwell, 2n = 26; C. flodmanii f. flodmanii and f. albiflorum D. Löve, 2n = 22. The origin of four North American species of Cirsium that do not follow the world-wide base number 17 is discussed; it is postulated that reduction in number has occurred by translocations. The chromosomes of species with reduced numbers are larger than those of the unreduced species but the total length of the chromosomes of both groups is approximately the same.

scholarly journals Thinking in colors

2021 ◽  
pp. 12-38
Author(s):  
Nikolai Aleksandrovich Kormin
Keyword(s):  
Cultural Identity ◽  
Color Harmony ◽  
Color Determination ◽  
The World ◽  
New Interpretation ◽  
The Aesthetic ◽  
First Time ◽  
Philosophy Of Arithmetic

This article reveals the philosophical grounds of the aesthetics of color, analyzes the correlation between the structures of philosophical and artistic comprehension of coloristics. Interaction of philosophy and art as the forms of cultural identity manifests in the sphere of intellectual understanding of the perception of color and its semantics in painting. In the hidden logic of contemplation of color, can be traced the outlines of the problematic of transcendental and intelligible in art conditions for the aesthetic approach towards chromatic space. Color creates the visual beauty, thus it is apparent why the aesthetic knowledge seeks to clarify to which extent we can assess the experience of color – the result of coloration of light. The art itself creates the so-called color ontology of the world. First the first time, the beauty of color and its perception are analyzed in the context of correlation between art and transcendental traditions of philosophizing  (Descartes, Kant, early Husserl –  his work “The Philosophy of Arithmetic”) that allows matching the key to a new interpretation of the tradition of color. Determination of its meaning requires comparing history and structure of the philosophical and artistic metaphor of color. It is demonstrated that the phenomenon of color is of crucial significance for the aesthetics, as it implies not only comprehension of the problem of correlation between nature and art, but also cognition of the beauty of color, its universal value for all forms of art, profound structures of perception of coloristic phenomena, picturesque unveiling of the color harmony of the painting.

scholarly journals Descending Dysploidy and Bidirectional Changes in Genome Size Accompanied Crepis (Asteraceae) Evolution

Genes ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1436
Author(s):  
Magdalena Senderowicz ◽  
Teresa Nowak ◽  
Magdalena Rojek-Jelonek ◽  
Maciej Bisaga ◽  
Laszlo Papp ◽  
...  
Keyword(s):  
Genome Size ◽  
Dna Sequences ◽  
Chromosome Numbers ◽  
Karyotype Evolution ◽  
Base Number ◽  
Ancestral State ◽  
Ancestral Genome ◽  
Independent Events ◽  
Karyotype Asymmetry ◽  
Major Direction

The evolution of the karyotype and genome size was examined in species of Crepis sensu lato. The phylogenetic relationships, inferred from the plastid and nrITS DNA sequences, were used as a framework to infer the patterns of karyotype evolution. Five different base chromosome numbers (x = 3, 4, 5, 6, and 11) were observed. A phylogenetic analysis of the evolution of the chromosome numbers allowed the inference of x = 6 as the ancestral state and the descending dysploidy as the major direction of the chromosome base number evolution. The derived base chromosome numbers (x = 5, 4, and 3) were found to have originated independently and recurrently in the different lineages of the genus. A few independent events of increases in karyotype asymmetry were inferred to have accompanied the karyotype evolution in Crepis. The genome sizes of 33 Crepis species differed seven-fold and the ancestral genome size was reconstructed to be 1 C = 3.44 pg. Both decreases and increases in the genome size were inferred to have occurred within and between the lineages. The data suggest that, in addition to dysploidy, the amplification/elimination of various repetitive DNAs was likely involved in the genome and taxa differentiation in the genus.

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.

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