First report of meiotic chromosome number and karyotype analysis of an accession ofTrigonella balansae(Leguminosae)

2006 ◽  
Vol 49 (1) ◽  
pp. 55-58 ◽  
Author(s):  
Ian S. Dundas ◽  
Ramakrishnan M. Nair ◽  
Dawn C. Verlin
Keyword(s):  
Chromosome Number ◽  
Karyotype Analysis ◽  
Meiotic Chromosome ◽  
First Report

scholarly journals Karyotype analysis with orcein and CMA in two species of Alocasia (Schott) G. Don (Araceae)

1970 ◽  
Vol 40 (1) ◽  
pp. 53-56 ◽  
Author(s):  
Syeda Sharmeen Sultana ◽  
Hosne Ara ◽  
Sheikh Shamimul Alam
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Karyotype Analysis ◽  
Chromosome Complement ◽  
Taxonomic Status ◽  
The Other ◽  
First Report ◽  
Total Length ◽  
Internet Information ◽  
Chromosomal Length

Alocasia fallax Schott and A. odora (Roxb.) Koch (Araceae) were investigated cytogenetically to confirm their taxonomic status. There is no report of 2n chromosome number for A. fallax in the available literature and internet information. Therefore the 2n chromosome number (2n = 28) found in this study is probably the first report for A. fallax. Alocasia odora showed exactly double 2n chromosome number (2n = 56) from A. fallax. In addition to chromosome number, the other karyotypic features of A. odora were exactly double for that of A. fallax. The centromeric formulae of A. fallax was 24 m + 4 sm whereas it is just double in A. odora. Total length of 2n chromosome complement of A. odora (62.58 μm) was almost double to A. fallax. The range of chromosomal length of the two species was almost same. Moreover, A. odora plant is much taller than A. fallax. All of these data suggests that A. odora might be an autotetraploid of A. fallax which in course of evolution had undergone some changes in GC-rich repeats. Key words: Alocasia; CMA; Karyotype analysis DOI: http://dx.doi.org/10.3329/bjb.v40i1.7998 Bangladesh J. Bot. 40(1): 53-56, 2011 (June)

scholarly journals Karyotype Analysis of Alnus Mill. (Betulaceae) Species Originating From Northeastern Asia

2010 ◽  
Vol 59 (1-6) ◽  
pp. 219-223 ◽  
Author(s):  
Liu Jun ◽  
Ren Bao-Qing ◽  
Luo Peigao ◽  
Ren Zhenglong
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
Karyotype Analysis ◽  
Full Potential ◽  
Northeastern Asia ◽  
Ploidy Levels ◽  
Genetic Makeup ◽  
Fossil Records

Abstract Alnus Mill. (alder) is an ecologically valuable tree genus. It is essential to study its genetic makeup in order to use alder trees to their full potential. Five specimens from four Alnus species (A. mandshurica, A. pendula, A. sibirica, and A. sieboldiana), found in northeastern Asia, were subjected to karyotype analysis. The analysis showed that these tree samples could be divided into three categories based on chromosome numbers or ploidy levels: viz., 2n = (4x) = 28, 2n = (8x) = 56 and 2n = (16x) = 112. The differences in chromosome number and karyotype parameters among Alnus species and even within the same species possibly resulted from natural polyploidization. Comparing the chromosome numbers of Alnus species in China with those in Japan showed that there appear to be only two categories in China, whereas there are up to five categories in Japan. The earliest fossil records of Alnus pollen were also discovered in Japan. We conclude that the center origin of Alnus spp. is Japan rather than China.

scholarly journals Unveiling the 46,XY disorder of sex development patients family with a novel mutation in the GATA4 gene

2021 ◽  
Author(s):  
Liwei Li ◽  
Hui Yang ◽  
Junhong Zhang ◽  
Huijing Lv ◽  
Qing Li ◽  
...  
Keyword(s):  
Karyotype Analysis ◽  
Novel Mutation ◽  
Binding Protein ◽  
Gonadal Development ◽  
Heterozygous Mutation ◽  
Disorder Of Sex Development ◽  
First Report ◽  
Sex Development ◽  
Physical Examinations

Abstract Background GATA-binding protein 4 (GATA4) is the critical regulator in gonadal development and its mutation has been reported related with 46,XY disorder of sex development (DSD). Here, we found the two Chinese cases with 46,XY DSD carried the GATA4 mutation. Physical examinations, B-ultrasound and Karyotype analysis were performed and confirmed the two patients with 46,XY DSD. Results Sequencing were performed and the heterozygous mutation p.Gly375Arg in GATA4 gene was identified in the 2 cases with 46,XY DSD. Their mother was identified carrying the p.Gly375Arg mutation in GATA4 protein. However, their father and litter sister without 46,XY DSD didn’t be found carrying the p.Gly375Arg mutation in GATA4 gene. Conclusion This is the first report that the case with 46,XY DSD carried the mutation Gly375Arg in the GATA4 gene. Our

Meiotic chromosome behaviour in Cenchrus ciliaris

Bothalia ◽  
1998 ◽  
Vol 28 (1) ◽  
pp. 83-90 ◽  
Author(s):  
N. C. Visser ◽  
J. J. Spies
Keyword(s):  
Chromosome Number ◽  
Meiotic Chromosome ◽  
Basic Chromosome Number ◽  
Chromosome Behaviour ◽  
Meiotic Abnormalities ◽  
Single Specimen ◽  
Cenchrus Ciliaris ◽  
Basic Chromosome ◽  
Single Genome ◽  
Meiotic Irregularities

A basic chromosome number of x = 9 has been confirmed for Cenchrus ciliaris L. Polyploidy is common and levels vary from tetraploid to hexaploid. Aneuploidv is reported for a single specimen, where two chromosomes of a single genome were lost. Various meiotic irregularities were observed. The highest incidence of meiotic abnormalities was observed in the pentaploid specimens. This was attributed to their uneven polyploid level All specimens varied from segmental alloploid to alloploid.

THE SIGNIFICANCE OF MEIOTIC CHROMOSOME PAIRING IN TETRAPLOID (2n = 28) BROMUS PUMPELLIANUS SCRIBN. SSP. DICKSONII

1972 ◽  
Vol 14 (4) ◽  
pp. 763-771 ◽  
Author(s):  
K. C. Armstrong
Keyword(s):  
Chromosome Pairing ◽  
High Frequency ◽  
Chiasma Frequency ◽  
Karyotype Analysis ◽  
Meiotic Chromosome ◽  
Low Frequency ◽  
Meiotic Chromosome Pairing ◽  
Ring Bivalents ◽  
Bivalent Formation

Bivalent formation was predominant at meiosis in B. pumpellianus ssp. dicksonii. The average in 15 plants ranged from 11.38 to 13.77 bivalents per cell. The high chiasma frequency (23.41-26.74) was a reflection of the high frequency of ring bivalents (9.48-12.42). A low frequency of quadrivalents occurred (0.06-1.22). A karyotype of this species was presented from both a highly contracted and moderately contracted cell and the differences between these two were noted. Four satellites were found, two large and two minute. There were 3-5 submedian and 5-7 median chromosomes depending on the cell studied. In addition two subterminal chromosomes were present. The meiotic and karyotype analysis suggest a deviation from an autotetraploid behaviour, but the presence of quadrivalents and similarities between pairs in the karyotype suggested closely related genomes. Alternatively it was considered that the quadrivalents could be due to translocation heterozygotes. The implications of these results were discussed in relation to the reported meiotic events in the octoploids, B. inermis and B. pumpellianus.

scholarly journals Karyotypic Study of seven Types of Impatiens balsamina L.

1970 ◽  
Vol 15 ◽  
pp. 147-152 ◽  
Author(s):  
USN Momtaz ◽  
G Kabir ◽  
MM Ud-deen ◽  
N Yasmin
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Secondary Constriction ◽  
Karyotype Analysis ◽  
Diploid Chromosome Number ◽  
Interphase Chromosome ◽  
Karyotypic Analysis ◽  
Total Frequency ◽  
Impatiens Balsamina ◽  
Karyotypic Study

Nuclear phenotype and chromosome characteristics of eight types of Impatiens balsamina L. were studied. The diploid chromosome number was found to be 2n=14 in all types of Impatiens balsamina. Interphase chromosome volume was found to range from 0.1665μ3 (violet type) to 0.3904 μ3 (red type). The maximum total chromatin length (24.73μm) was observed in pink type and minimum (11.70μm) in violet type. Maximum total frequency percent (50.00%) was found in both foreign types (red and violet) and minimum (48.03%) in violet type. The karyotype analysis revealed that there was no secondary constriction and sub-terminal chromosome in any of the seven types belonging to Impatiens balsamina. So, on the basis of karyotypic analysis the present findings indicated that all the types of Impatiens balsamina were of primitive nature. Key words: Karyotype, Nuclear phenotype, Impatiens balsamina L.   doi: 10.3329/jbs.v15i0.2155    J. bio-sci. 15: 147-152, 2007

The chromosomes of Metachirus nudicaudatus (Marsupialia : Didelphidae)

1973 ◽  
Vol 21 (3) ◽  
pp. 369 ◽  
Author(s):  
E Yunis ◽  
J Cayon ◽  
E Ramirez
Keyword(s):  
Chromosome Number ◽  
Y Chromosome ◽  
Sex Chromosomes ◽  
Evolutionary History ◽  
Meiotic Chromosome ◽  
Staining Technique ◽  
Pachytene Stage ◽  
Apparent Lack ◽  
Heterochromatin Staining ◽  
Metachirus Nudicaudatus

A karyologic study of M. nudicaudatus, carried out on three females and five males, shows a chromosome number of 14, with apparent lack of dimorphism in the sex chromosomes. Nevertheless, the heterochromatin staining technique reveals the Y chromosome to be fully heteropycnotic. The meiotic chromosome has a sex vesicle at the pachytene stage. The similarity of this karyotype with those of Caluromys derbianus and Dromiciops australis is striking, especially considering that the genera belong to two subfamilies separated early in their evolutionary history. Our results support the opinion of Hayman and Martin that the original chromosome number in Marsupialia was 14.

Cytoembryology of Amaryllis hybrids

1989 ◽  
Vol 67 (3) ◽  
pp. 839-847 ◽  
Author(s):  
Tasneem F. Khaleel ◽  
Daniel Siemsen
Keyword(s):  
Chromosome Number ◽  
Seed Set ◽  
Karyotype Analysis ◽  
Pollen Grains ◽  
Basic Chromosome Number ◽  
Archesporial Cell ◽  
Anther Wall ◽  
Basic Chromosome ◽  
Development Of Gametophytes ◽  
Secretory Type

Karyotype analysis, sporogenesis, and the development of gametophytes are described for four hybrids of garden Amaryllis. The basic chromosome number is x = 11, and all four hybrids are tetraploid. The basikaryotype, which consists of two median, five submedian, and four subterminal chromosomes, is traceable in four hybrids. The anther wall is five to six layered. The tapetum is of the secretory type, and its cells become two nucleate at the onset of meiosis in the microsporocytes. Bivalents, trivalents, and quadrivalents are formed during meiosis. The endothecial cells lack fibrillar thickenings. Pollen grains are shed at the two-celled stage. About 60–70% of the pollen grains are fertile. Ovules are anatropous and bitegmic. The archesporial cell may or may not undergo periclinal division. Development of the megagametophyte is monosporic in 90% of the ovules and bisporic in the remaining 10%. All four hybrids show degeneration of embryo sacs at various stages of development which accounts for the low percentage or lack of seed set.

Chromosome numbers of some North American species of Artemisia (Asteraceae)

1988 ◽  
Vol 66 (4) ◽  
pp. 672-676 ◽  
Author(s):  
A. E. Stahevitch ◽  
W. A. Wojtas
Keyword(s):  
United States ◽  
Chromosome Number ◽  
Chromosome Numbers ◽  
The United States ◽  
North American Species ◽  
First Report ◽  
Supernumerary Chromosomes ◽  
Chromosomal Races ◽  
First Time ◽  
Ecological Differences

Chromosome number determinations are reported for 58 accessions, comprising 13 native and introduced taxa of Artemisia found in Canada and the United States. Chromosome numbers observed were n = 8, 9, 18, and 27. A chromosome number of 2n = 18 is the first report for A. pacifica Nutt. A new tetraploid cytotype (2n = 36) was found in A. frigida Willd. Supernumerary chromosomes (n = 9 + 3) and mixoploidy (n = 18, 36) were also observed in this taxon for the first time. Heteroploidy was present in several species. In some taxa, morphological or ecological differences between the chromosomal races were detected; in other cases no differences were noted. Karylogical and phylogenetic evidence is presented for the original chromosome number in Artemisia having been x = 9.

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