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)

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.

scholarly journals 'n Vergelykende studie van die kariotipes van Tilapia rendalli, Tilapia sparrmanii en Oreochromis mossambicus (Cichlidae)

1992 ◽  
Vol 11 (3) ◽  
pp. 105-109 ◽  
Author(s):  
A. Swanepoel
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
Chromosome Pair ◽  
Somatic Chromosome ◽  
Oreochromis Mossambicus ◽  
Tilapia Rendalli ◽  
Lymphocyte Cultures ◽  
L1 And L2 ◽  
Somatic Chromosome Numbers ◽  
Standard Techniques

Optimal chromosome preparations were obtained from stimulated lymphocyte cultures with a new method based on a combination and modification of several techniques. Tilapia rendalli, T. sparrmanii and Oreochromis mossambicus have somatic chromosome numbers of 44, 42 and 44, respectively. Chromosome pairs L1 and L2 are easily identified in all the karyotypes and distinctive of the tilapias. Tilapia sparrmanii has one additional large metacentric chromosome pair(L3), which occurs concurrently with the reduction of two in the total chromosome number. The F chromosomes were divided into two groups, viz a submetacentric (sm) and a telocentric (t) group. T. rendalli has 8 sm chromosomes, while both T. sparrmanii and O. mossambicus have 6 chromosomes in the sm group. The rest of the F chromosomes were telocentric. The identification of the sex chromosomes in the karyotypes of tilapia has thus far not been possible using standard techniques.

A CYTOLOGICAL STUDY OF THE GENUS POA L.

1937 ◽  
Vol 15c (6) ◽  
pp. 281-297 ◽  
Author(s):  
J. M. Armstrong
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
High Frequency ◽  
Somatic Chromosome ◽  
Poa Pratensis ◽  
Basic Chromosome Number ◽  
Somatic Chromosome Number ◽  
Indigenous Plants ◽  
Somatic Chromosome Numbers ◽  
Fibre Attachment

The somatic chromosome numbers of 20 species of Poa were determined. The basic chromosome number for the genus was found to be seven. The species arranged themselves in a polyploid series from diploid to dodecaploid, tetraploids and hexaploids being the most numerous. Three aneuploid species possessed chromosome numbers suggestive of a nonaploid origin. Polymorphism was found to be present in P. compressa L., P. palustris L. and P. nemoralis L. All species examined conformed to the long chromosome type common to the subfamily, Pooideae. The spindle fibre attachment for the chromosomes in the various species ideograms was found to be regularly median or submedian.The chromosome variability and the mode of seed production were examined in Poa pratensis L., using selected, uniform strains, indigenous plants and plants grown from commercial seed. The somatic chromosome number was found to range from 50 to 87 ± 1, 10 of the 19 plants examined possessing aneuploid numbers. The selected strains possessed the same chromosome number for both plants examined, while in the other material the number was variable. A study of meiosis in the P.M.C. showed the selected strains to vary from regular behavior to an irregularity of 3.9 unpaired univalents per cell. All strains possessed large percentages of morphologically good pollen which germinated actively on the stigmas. Reduction was observed in the E.M.C. of the selected strains and a study of the course of embryological development showed no irregularities which might lead to aposporous reproduction. A high frequency of polyembryony was observed which was correlated to the degree of irregularity at meiosis. A theory is advanced to explain how constant aneuploid numbers may be maintained in sexually reproduced strains.

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.

AN EVALUATION OF THE STATUS OF CIRSIUM PUMILUM AND CIRSIUM HILLII

1966 ◽  
Vol 44 (5) ◽  
pp. 581-595 ◽  
Author(s):  
R. J. Moore ◽  
C. Frankton
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
Somatic Chromosome ◽  
The Status ◽  
Somatic Chromosome Numbers

The specific separation of Cirsium hillii and C. pumilum has long been questioned. Their morphology, cytology, and distribution are discussed and it is concluded that two subspecies be recognized: C. pumilum (Nutt.) Spreng. ssp. pumilum and ssp. hillii (Canby) Moore & Frankton. The chromosome number of each subspecies is 2n = 30. Hybrids with the somatic chromosome numbers 31, 32 between ssp. pumilum (2n = 30) and C. horridulum Michx. (2n = 34) have been found in Massachusetts. It is suggested that introgression of C. horridulum into ssp. pumilum may be increasing variability of the latter.

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 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 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.

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.

Sign in / Sign up

Export Citation Format

Share Document