NEW CHROMOSOME COUNTS OFBERBERISL. (BERBERIDACEAE) SUGGEST THAT POLYPLOIDY DOES NOT PLAY A SIGNIFICANT ROLE IN THE DIVERSIFICATION OF THE GENUS IN THE NEPAL HIMALAYA

2014 ◽  
Vol 71 (3) ◽  
pp. 297-308 ◽  
Author(s):  
B. Adhikari ◽  
C. A. Pendry ◽  
M. Möller
Keyword(s):  
Significant Role ◽  
Chromosome Numbers ◽  
Somatic Chromosome ◽  
Chromosome Counts ◽  
Nepal Himalaya ◽  
First Time ◽  
Somatic Chromosome Numbers

Chromosomes were counted for nine of the 24 taxa ofBerberis(Berberidaceae) from Nepal, five of which were counted for the first time. The results show that all these species have somatic chromosome numbers of 2n= 28. The absence of polyploids suggests that polyploidy may not have been a major driver of speciation and diversification ofBerberisin the Nepal Himalaya.

scholarly journals Diversity and cytological studies of the Genus Amomum Roxb. former Elettariopsis Baker (Zingiberaceae) in Thailand

2021 ◽  
Vol 22 (6) ◽  
Author(s):  
Surapon Saensouk ◽  
Piyaporn Saensouik
Keyword(s):  
Chromosome Numbers ◽  
Somatic Chromosome ◽  
Field Trips ◽  
Root Tips ◽  
Metaphase Chromosomes ◽  
Vernacular Names ◽  
Living Species ◽  
First Time ◽  
Somatic Chromosome Numbers

Abstract. Saensouk P, Saensouk S. 2021. Diversity and cytological studies on the genus Amomum Roxb. former Elettariopsis Baker (Zingiberaceae) in Thailand. Biodiversitas 22: 3209-3218. A comprehensive diversity and cytological studies of the genus Amomum Roxb. in Thailand have not been reported. This work aims to study the diversity and cytological including chromosome numbers and karyotypes of the genus Amomum Roxb. former Elettariopsis Bakerin Thailand. Ten species of Amomum were recognized from Thailand. Nomenclatures, vernacular names, distribution, ecology, and traditional utilization are provided. Only Amomum wandokthong is widely cultivated in all parts in Thailand. Four living species, i.e. Amomum curtisii, A. monophyllum, A. trilobum, and A. wandokthong have been collected from field trips. Therefore, the somatic chromosome numbers from four species of this genus were studied from root tips. The somatic chromosome numbers of each species in this study were counted from 20 cells. The karyotype formulas were derived from measurements of the metaphase chromosomes in photomicrographs. The chromosome numbers of four species were found to be 2n = 48. Karyotypes of four species were reported to be Amomum curtisii (32m + 8sm + 8st), A. monophyllum (26m + 12sm + 10st), A. trilobum (18m + 24sm + 6st), and A. wandokthong (28m + 16sm + 4st with five visible satellites chromosomes). The chromosome numbers of A. monophyllum and A. wandokthong were reported for the first time. The karyotypes of four species were studied for the first time.

Circaea × intermedia in eastern North America with particular reference to Ontario

1977 ◽  
Vol 55 (23) ◽  
pp. 2919-2935 ◽  
Author(s):  
Erich Haber
Keyword(s):  
North America ◽  
North American ◽  
Chromosome Numbers ◽  
Interspecific Hybrid ◽  
Somatic Chromosome ◽  
Parental Species ◽  
Eastern North America ◽  
Chromosome Counts ◽  
Morphological Differences ◽  
Somatic Chromosome Numbers

Circaea × intermedia Ehrh. in North America is an interspecific hybrid between C. alpina L. and C. lutetiana L. subsp. canadensis Aschers. & Magnus. In spite of the morphological differences that exist between the European and North American subspecies of C. lutetiana, hybrids from both continents are morphologically identical. Documentation of the intermediacy of the hybrid taxon is presented based on the evaluation of the means of 22 characters of specimens from an Ontario locality at which all three taxa are found.Diploid chromosome counts of 2n = 22 are reported for Ontario populations of the hybrid and parental species. The presence of irregular, somatic chromosome numbers are also reported for all three taxa.Distribution maps for all three taxa in eastern North America are included. In the case of C. lutetiana subsp. canadensis, the northern range is sharply delimited by the Precambrian–Paleozoic bedrock boundary.A table of character comparisons and a key to the three taxa summarizes the salient characteristics of the hybrid and the parental species in eastern North America.

scholarly journals Chromosome Numbers in 11 Species of Taraxacum Section Erythrosperma Dt. from Poland

2017 ◽  
Vol 59 (2) ◽  
pp. 77-82 ◽  
Author(s):  
Mateusz Marian Wolanin ◽  
Krystyna Musiał
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
Somatic Chromosome ◽  
First Time ◽  
Somatic Chromosome Numbers ◽  
Eleven Species

AbstractKaryology of eleven species of Taraxacum sect. Erythrosperma from Poland has been studied. Somatic chromosome numbers are given for the following species: T. bellicum, T. brachyglossum, T. cristatum, T. disseminatum, T. dissimile, T. lacistophyllum, T. parnassicum, T. plumbeum, T. proximum, T. scanicum, and T. tenuilobum. Although the hypertriploid chromosome number was previously reported in Poland for T. lacistophyllum, T. parnassicum, T. scanicum, and T. tenuilobum, we proved the triploid chromosome number 2n = 24 in all the species investigated, which is consistent with the data reported from other regions of Europe. The chromosome numbers of T. bellicum, T. cristatum, T. disseminatum, T. dissimile, T. plumbeum, and T. proximum growing in Poland are published for the first time.

scholarly journals Chromosome numbers in Begonia.

1969 ◽  
Vol 17 (3) ◽  
pp. 189-202 ◽  
Author(s):  
R.A.H. Legro ◽  
J. Doorenbos
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
Somatic Chromosome ◽  
Polyploid Series ◽  
First Time ◽  
Somatic Chromosome Numbers

The somatic chromosome numbers of 100 Begonia species were counted, of which 72 have been determined for the first time. Eighteen different numbers have been established, ranging between 22 and 156, fifteen of which could be fitted into a tentative scheme of five polyploid series. The most common numbers were 22 (14 species), 28 (35 species) and 56 (17 species). The species have been grouped into sections according to Irmscher. In some cases these sections appeared to have a characteristic chromosome number whereas in others, e.g. Pritzelia and Begoniastrum, a great diversity in chromosome number was encountered. [For earlier work see H.A., 39: 5182.]-Univ. Wageningen. (Abstract retrieved from CAB Abstracts by CABI’s permission)

CHROMOSOME NUMBERS AND TAXONOMIC NOTES ON NORTHERN GRASSES: II. TRIBE FESTUCEAE

1960 ◽  
Vol 38 (2) ◽  
pp. 117-131 ◽  
Author(s):  
Wray M. Bowden
Keyword(s):  
Chromosome Numbers ◽  
Somatic Chromosome ◽  
Bromus Tectorum ◽  
Dactylis Glomerata ◽  
Bromus Inermis ◽  
Festuca Rubra ◽  
Lolium Rigidum ◽  
Voucher Specimens ◽  
Dactylis Glomerata L ◽  
Somatic Chromosome Numbers

Chromosome numbers and voucher specimens are recorded for some collections of the tribe FESTUCEAE Dumort., mainly collected in Canada. The somatic chromosome numbers of the following are recorded: (1a) Arctagrostis arundinacea (Trin.) Beal var. arundinacea, 2n = 28, 2n = 29, and 2n = 30; (1b) Arctagrostis arundinacea (Trin.) Beal var. crassispica Bowden, 2n = 56; (1c) Arctagrostis latifolia (R.Br.) Griseb., 2n = 56. (2) Beckmannia syzigachne (Steud.) Fern., 2n = 14. (3) Brachyelytrum erectum (Schreb.) Beauv., two vars., 2n = 22. (4a) Bromus ciliatus L., 2n = 14; (4b) Bromus inermis Leyss., two subspecies and two vars., 2n = 56; (4e) Bromus kalmii A. Gray, 2n = 14; (4d) Bromus porteri (Coult.) Nash, 2n = 14; (4c) Bromus tectorum L., 2n = 14. (5) Catabrosa aquatica (L.) Beauv. var. laurentiana Fern., 2n = 20. (6) Dactylis glomerata L., 2n = 28. (7) Distichlisstricta (Torr.) Rydb., 2n = 40. (8a) Dupontiafisheri R.Br, subsp. fisheri, 2n = 132; (8b) Dupontia fisheri R.Br, subsp. psilosantha (Rupr.) Hultén, 2n = 44. (9) Eremopoa persica (Trin.) Roshev., 2n = 28. (10a) Festuca altaica Trin., 2n = 28; (10b) Festuca baffinensis Polunin, 2n = 28; (10c) Festuca brachyphylla Schultes, 2n = 42 and one collection, 2n = 44; (10d) Festuca elatior L., 2n = 14; (10e) Festuca obtusa Bieler, 2n = 42; (10f) Festuca prolifera (Piper) Fern. var. lasiolepis Fern., 2n = 50; (10g) Festuca rubra L., 2n = 42; (10h) Festuca saximontana Rydb., 2n = 42; (10i)Festuca scabrella Torr. ex Hook., two vars., 2n = 56 and 2n = 28. (11a) Glyceria borealis (Nash) Batchelder, 2n = 20; (11b) Glyceria canadensis (Michx.) Trin., 2n = 60; (11c) Glyceria grandis S. Wats., 2n = 20; (11d) Glyceria melicaria (Michx.) Hubb., 2n = 40; (11e) Glyceria pulchella (Nash) K. Schum., 2n = 20; (11f) Glyceria striata (Lam.) Hitchc, 2n = 20; (11g) Glyceria × gatineauensis Bowden (G. melicaria × G. striata), 2n = 30; (11h)Glyceria × ottawensis Bowden (G. canadensis × G. striata), three nothomorphs, 2n = 42, 2n = 46, and 2n = 48. (12) Lolium rigidum Gaud., 2n = 14. (13a) Phippsiaalgida (Sol.) R.Br., 2n = 28; (13b) Phippsia concinna (Th. Fries) Lindeb., 2n = 28. (14) Pleuropogon sabinei R.Br., 2n = 42. (15) Schizachnepurpurascens (Torr.) Swallen, 2n = 20. (16) Torreyochloa fernaldii (Hitchc.) Church, 2n = 14.

scholarly journals Badania kariologiczne nad dwoma gatunkami rodzaju Sparganium L. [Karyological studies in two species of the genus Sparganium]

2015 ◽  
Vol 40 (1) ◽  
pp. 143-148
Author(s):  
K. Bijok ◽  
E. Adamkiewicz
Keyword(s):  
Chromosome Numbers ◽  
Somatic Chromosome ◽  
Somatic Chromosome Numbers

The somatic chromosome numbers 2n = 30 for <em>Sparganium neglectum</em> and <em>S. minimum</em> was established. The karyotype of the first species consist of 8 iso- and 7 heterobronchial chromosomes and the reverse is true for the second species. In metabolic nuclei 30 chromocentres are visible.

SOMATIC CHROMOSOME NUMBERS IN CERTAIN TRIFOLIUM SPECIES

1972 ◽  
Vol 14 (1) ◽  
pp. 139-145 ◽  
Author(s):  
M. K. Anderson ◽  
N. L. Taylor ◽  
G. B. Collins
Keyword(s):  
Chromosome Numbers ◽  
Somatic Chromosome ◽  
Karyotype Analyses ◽  
Somatic Chromosome Numbers

In the present study chromosome numbers of 13 Trifolium species were determined, making a total of 155 species for which chromosome numbers have been reported. Four species which have been reported only once were confirmed. Eleven of the 17 species observed have 16 chromosomes (n = 8). T. bocconei Savi was found to have 12 chromosomes (n = 6) and T. desvauxii Boess. and Bl. was found to have 10 chromosomes (n = 5). Karyotype analyses of T. bocconei and T. desvauxii revealed that the chromosomes of each species could be differentiated on the basis of arm ratios and chromosome lengths.

CHROMOSOME NUMBERS AND TAXONOMIC NOTES ON NORTHERN GRASSES: IV. TRIBE FESTUCEAE: POA, AND PUCCINELLIA

1961 ◽  
Vol 39 (1) ◽  
pp. 123-138 ◽  
Author(s):  
Wray M. Bowden
Keyword(s):  
Chromosome Numbers ◽  
Somatic Chromosome ◽  
Voucher Specimens ◽  
Somatic Chromosome Numbers

Chromosome numbers and voucher specimens are recorded for some Canadian and Alaskan collections and a few mainland American collections of Poa and Puccinellia which belong to the tribe FESTUCEAE. The somatic chromosome numbers of the following are recorded: (1) Poa agassizensis, 2n = ca. 56; P. alpina, 2n = 32, 33, 39, and 42; P. ampla, 2n = 62; P. annua, 2n = 28; P. arctica, 2n = 56, 63, 70, ca. 75, 78, 82, 85, 86, and 106; P. arida, 2n = ca. 76; P. canbyi, 2n = 56, 70, and ca. 98; P. cusickii, 2n = 56, and 59; P. eminens, 2n = 42; P. fernaldiana, 2n = ca. 42; P. glauca, 2n = 42, 50, 56, 64, 65, 70, 75, and 78; P. glaucantha, 2n = 44; P. glaucifolia, 2n = 56, ca. 70, and ca. 100; P. interior, 2n = 28, 34, 42, and 56; P. juncifolia, 2n = ca. 60; P. leptocoma, 2n = 42; P. nervosa, 2n = 56, and ca. 74; P. palustris, 2n = 28, 30, and 32; P. pratensis, 2n = 28, 42, 44, 56, ca. 66, 67, 70, 74, ca. 78, ca. 82, 84, 86, 88, and ca. 124; P. saltuensis, 2n = 28; P. secunda, 2n = 42, 56, 70, ca. 78, 80. and ca. 90; P. stenantha, 2n = 42; and P. trivialis, 2n = 14.(2) Puccinellia ambigua, 2n = 56; P. americana, 2n = ca. 42 and 56; P. angustata, 2n = 42; P. borealis, 2n = 42; P. bruggemannii, 2n = 28; P. cusickii, 2n = 28; P. distans, 2n = 42; P. glabra, 2n = 42 and 56; P. hauptiana, 2n = 28; P. laurentiana, 2n = 42 and 56; P.longiglumis, 2n = 56; P. lucida, 2n = 42 and 56; P. nuttalliana, 2n = 42; P. × phryganodes, 2n = 21; P. vaginata, 2n = 56; and P. vahliana, 2n = 14.

scholarly journals A report on new chromosome number of three Dioscorea species

2019 ◽  
Vol 6 (2) ◽  
pp. 147-150
Author(s):  
Chiranjit Paul ◽  
Bimal Debnath
Keyword(s):  
Chromosome Number ◽  
Somatic Chromosome ◽  
Chromosome Count ◽  
Somatic Chromosome Number ◽  
Chromosome Counts ◽  
North East India ◽  
North East ◽  
Forest Belts ◽  
Dioscorea Species ◽  
First Time

Chromosomal study conducted in nine species of Dioscorea from different forest belts of Tripura revealed that their somatic chromosome number ranged from 2n=40 to 2n=60. The record of 2n=40 chromosome in the sexual phenotypes of Dioscorea hamiltonii, Dioscorea glabra and Dioscorea pubera are the first time report from Tripura, North East India. Moreover the somatic chromosome counts of 2n=60 in Dioscorea pentaphylla would be attributed as a new cytotype. However at the respective ploidy level no difference in somatic chromosome count was observed between their sexes.

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