scholarly journals Chromosome number and meiotic behavior in several plant taxa from iran

2021 ◽  
Vol 45 (2) ◽  
pp. 333-339
Author(s):  
Seyed Ghaffari ◽  
Abbas Zare ◽  
Fereshteh Corom ◽  
Masoureh Sedaghati
Keyword(s):  
Chromosome Number ◽  
Endemic Species ◽  
Chromosome Numbers ◽  
Mitotic Chromosome ◽  
Vascular Plant ◽  
Meiotic Behavior ◽  
Chromosome Counts ◽  
Plant Families ◽  
First Time ◽  
Accessory Chromosomes

Original meiotic or both meiotic and mitotic chromosome numbers are reported for ten endemic and one non endemic species in nine vascular plant families from Iran. The chromosome numbers of Acantholimon schahrudicum, A. truncatum, Anthochlamys multinervis, Campanula perpusilla, Cousinia calcitrapa var. interrupta, Dorema ammoniacum, Euphorbia gedrosiaca, and Hyocyamus orthocarpus were determined for the first time. The chromosome counts for Astrodaucus persicus and Hedysarum criniferum agree with previous ones. The gametic chromosome numbers for Hedysarum criniferum and Allium stipitatum are reported here for the first time. The occurrence of accessory chromosomes are also reported for Acantholimon schahrudicum and Dorema ammoniacum, being the first records of B chromosomes in the genera Acantholimon and Dorema.

scholarly journals Chromosome Numbers of Four Nigerian Species of Cola Schott. & Endlicher (Sterculiaceae).

2005 ◽  
Vol 54 (1-6) ◽  
pp. 42-44 ◽  
Author(s):  
P. O. Adebola ◽  
J. A. Morakinyo
Keyword(s):  
Chromosome Numbers ◽  
Wild Species ◽  
Mitotic Chromosome ◽  
Chromosome Morphology ◽  
High Symmetry ◽  
Chromosome Counts ◽  
Ploidy Levels ◽  
Breeding Programmes ◽  
Cultivated Species ◽  
First Time

Abstract This paper reports the results of chromosome countings in four wild Cola species (Cola lateritia, C. ballayi, C. verticillata and C. gigantea). Cytological investigation of these species gave a constant mitotic chromosome counts of 2n = 4x = 40 for the first time. The karyotypes were found to consist mostly of metacentric and submetacentric chromosomes. In addition to confirming the chromosome numbers and ploidy levels in these species, the results also reveals high symmetry and homogeneity of the karyotypes with those of the cultivated species (C. nitida and C. acuminata) already reported. The similarity in chromosome morphology between the cultivated and wild species indicate their common origin and suggests the possibility of using these wild species as bridges for gene transfer in Cola breeding programmes involving interspecific hybridization.

CYTOTAXONOMY OF THREE SPECIES OF CENTAUREA ADVENTIVE IN CANADA

1954 ◽  
Vol 32 (1) ◽  
pp. 182-186 ◽  
Author(s):  
R. J. Moore ◽  
C. Frankton
Keyword(s):  
Chromosome Number ◽  
Introduced Species ◽  
Chromosome Numbers ◽  
Diploid Chromosome Number ◽  
Chromosome Counts ◽  
Normal Pollen ◽  
Taxonomic Problem ◽  
First Time

The chromosome numbers of three introduced species of Centaurea are here reported: C. diffusa Lam., 2n = 18; C. maculosa, Lam., 2n = 36; C. repens L., 2n = 26. The chromosome counts of C. diffusa and of C. maculosa, which are here reported for the first time, help to clarify a taxonomic problem. A pappus is usually lacking on the achenes of C. diffusa but is present on those of C. maculosa. As a result, plants of C. diffusa with a short pappus have been considered to be possible hybrids between these species. Three such plants here studied had the diploid chromosome number 18, rather than the triploid number to be expected in such a hybrid. Examination of pollen of suspected hybrid specimens shows that the percentage of normal pollen is high. This fact also supports the belief that plants of C. diffusa with a short pappus on the achene are not hybrids with C. maculosa.

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.

scholarly journals Chromosome counts inGaultheriaand related genera

1990 ◽  
Vol 47 (3) ◽  
pp. 303-313 ◽  
Author(s):  
D. J. Middleton ◽  
C. C. Wilcock
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
Chromosome Counts ◽  
First Time

The chromosome numbers of 32 taxa in the ‘Gaultheria group’ of genera of the tribe Andromedeae in the Ericaceae have been counted; 15 of these have been counted for the first time. All taxa counted inGaultheriaandLeucothoëhave a chromosome number based on x = 11. The chromosome numbers counted inDiplycosiaare 2n = 36 and inZenobia2n = c.66.G. insanaandG. procumbensshow different polyploid races:G. insanatetraploids and hexaploids andG. procumbensdiploids, tetraploids and octoploids.

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.

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.

Can morphology and chromosome number contribute to species delimitation? A case in the Hibiscus trionum complex (Tribe Hibisceae, Malvaceae)

Phytotaxa ◽  
2019 ◽  
Vol 416 (4) ◽  
pp. 278-286
Author(s):  
MOHAMED OWIS BADRY ◽  
JENNIFER A. TATE ◽  
PRASHANT JOSHI ◽  
AHMED MAHMOUD ABBAS ◽  
SOHAIR THABET HAMED ◽  
...  
Keyword(s):  
Chromosome Number ◽  
Species Delimitation ◽  
Taxonomic Revision ◽  
Herbarium Specimens ◽  
Chromosome Counts ◽  
Comprehensive Description ◽  
Hibiscus Trionum ◽  
The World ◽  
First Time

A taxonomic revision of Hibiscus trionum from Egypt was undertaken using morphological and cytological studies of field collections and herbarium specimens. The data indicate that all specimens so far collected in Egypt belong to H. tridactylites, rather than H. trionum. This paper includes a comprehensive description of H. tridactylites, its occurrence, a comparison with other species in the H. trionum complex, and comments on habitat, along with images for easy identification. In addition, chromosome counts for this species from Egypt have been determined for the first time, which add to existing information on chromosome counts for the species from different regions of the world.

Chromosome numbers, meiotic behavior, and notes on tropical American grasses (Gramineae)

1974 ◽  
Vol 52 (2) ◽  
pp. 317-328 ◽  
Author(s):  
Gerrit Davidse ◽  
Richard W. Pohl
Keyword(s):  
Chromosome Numbers ◽  
Meiotic Behavior ◽  
Chromosome Counts

Chromosome numbers and meiotic behavior are reported for 126 collections of grasses representing 50 genera and 111 species. First counts are given for the genera Leptothrium, n = 10, and Cryptochloa, 2n = 22 (somatic count). First chromosome counts are given for the following 25 species: Aristida recurvata, n = 11; Axonopus laxus, n = 20; Chloris mollis, n = 20; Chusquea longifolia, n = 20; Cryptochloa concinna, 2n = 22; Digitaria abyssinica, n = 18; Eragrostis airoides, n = 36; E. guianensis, n = 10; Eriochloa boxiana, n = 18; Gymnopogon foliosus, n = 10; Leptothrium rigidum, n = 10; Luziola pittieri, n = 12; L. spruceana, n = 24; Otachyrium inaequale, n = 10; Panicum cayennense, n = 27; P. chloroticiun, n = 18; P. schiffneri, n = 18; Pappophorum pappiferum, n = 30; Paspalum apiculatum, n = 10; P. arundinaceum, n = 30; P. contractum, n = 9; P. coryphaeum, n = 30; P. trachycoleon, n = 20; Setaria barbata, n = 27; and Trisetum foliosum, n = 28. Counts that differ from previously reported counts are given for the following 15 species: Axonopus chrysoblepharis, n = 10; Cenchrus brownii, n = 34; Digitaria horizontalis, n = 9, 27; Echinolaena gracilis, n = 10; Euclasta condylotricha, n = 10; Hyperthelia dissoluta, n = ca. 30; Ischaemum guianense, n = 18; Microchloa indica, n = 12; Paspalum candidum, n = 10; P. melanospermum, n = 20; P. prostratum, n = 10; Rhytachne rottboellioides, n = 16; Setaria paniculifera, n = 16; Sorghastrum incompletum, n = 20; and Thrasya petrosa, n = 30. Changes in nomenclature are indicated for Digitaria species whose chromosome numbers were reported in our earlier publications.

Chromosome numbers of 15 North American bumble bee species (Hymenoptera, Apidae, Bombini)

1983 ◽  
Vol 25 (1) ◽  
pp. 26-29
Author(s):  
Robin E. Owen
Keyword(s):  
Chromosome Number ◽  
North American ◽  
Chromosome Numbers ◽  
Bumble Bees ◽  
Bumble Bee ◽  
Morphological Divergence ◽  
Chromosome Counts ◽  
Monophyletic Origin ◽  
The Social

Chromosome counts were obtained for 14 Bombus Latr. species (the social bumble bees) belonging to four subgenera and for one Psithyrus Lep. species (the social parasitic bumble bees). In Bombus the haploid numbers were consistent within each subgenus and there was variation between subgenera; the subgenera Bombus s.s. and Pyrobombus have n = 18, while Separatobombus and Cullumanobombus have n = 19. Thus considerable morphological divergence between subgenera is often, but not always, paralleled by divergence in chromosome number. Psithyrus ashtoni has n = 25, higher than all Bombus species yet examined. This provides support for the monophyletic origin of Psithyrus, but the high n is not expected if eusociality selects for increase in chromosome number.

Chromosome numbers in Impatiens (Balsaminaceae)

1984 ◽  
Vol 62 (12) ◽  
pp. 2630-2635 ◽  
Author(s):  
A. E. Zinov'eva-Stahevitch ◽  
W. F. Grant
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
First Record ◽  
Hybrid Origin ◽  
Putative Hybrid ◽  
South Indian ◽  
First Time

Chromosome numbers were determined for 44 taxa of Impatiens. Ten of these are reported for the first time, of which one is the first record for a species native to Borneo. Chromosome numbers ranged from n = 3 to n = 24. Three new dysploid cytotypes were observed. A chromosome number of n = 17, previously recorded only from Thailand and Malaysia, was found in a South Indian taxon whose putative hybrid origin is discussed. The frequency of the different chromosome numbers occurring in the genus (n = 3 to n = 33) is summarized and dysploidy and polyploidy are discussed.

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