scholarly journals Karyological Analysis of Endemic Five Muscari Taxa

CYTOLOGIA ◽  
2020 ◽  
Vol 85 (4) ◽  
pp. 289-294
Author(s):  
Meryem Bozkurt
Keyword(s):  
Karyological Analysis

scholarly journals Karyological analysis of bitter gourd (Momordica charantia L., Cucurbitaceae) from Southeast Asian countries

2020 ◽  
Vol 18 (3) ◽  
pp. 200-200
Author(s):  
Nadia Kausar ◽  
Zubaida Yousaf ◽  
Afifa Younas ◽  
Hafiza Sadia Ahmed ◽  
Madiha Rashid ◽  
...  
Keyword(s):  
Southeast Asian ◽  
Momordica Charantia ◽  
Bitter Gourd ◽  
Asian Countries ◽  
Karyological Analysis ◽  
Southeast Asian Countries

On the role of germ cells in planarian regeneration

Development ◽  
1980 ◽  
Vol 55 (1) ◽  
pp. 53-63
Author(s):  
V. Gremigni ◽  
C. Miceli ◽  
I. Puccinelli
Keyword(s):  
Chromosome Number ◽  
Germ Cells ◽  
Primordial Germ Cells ◽  
Karyological Analysis ◽  
Blastema Formation ◽  
Planarian Regeneration ◽  
Somatic Tissues ◽  
Caudal Area ◽  
Complete Regeneration

Specimens from a polyploid biotype of Dugesia lugubris s.l. were used to clarify the role and fate of germ cells during planarian regeneration. These specimens provide a useful karyological marker because embryonic and somatic cells (3n = 12) can be easily distinguished from male (2n = 8) and female (6n = 24) germ cells by their chromosome number. We succeed in demonstrating how primordial germ cells participate in blastema formation and take part in rebuilding somatic tissues. This evidence was obtained by cutting each planarian specimen twice at appropriate levels. The first aimed to induce primordial germ cells to migrate to the wound. The second cut was performed after complete regeneration and aimed to obtain a blastema from a cephalic or caudal area devoid of gonads. A karyological analysis of mitotic cells present in each blastema obtained after the second cut provided evidence that cells, originally belonging to the germ lines, are still present in somatic tissues even months after complete regeneration. The role of primordial germ cells in planarian regeneration was finally discussed in relation to the phenomenon of metaplasia or transdifferentiation.

Karyological analysis of the sea cicada Blepharipoda liberate Shen from the Rizhao intertidal zone, China

2018 ◽  
Vol 37 (1) ◽  
pp. 169-175
Author(s):  
Liqing Zhou ◽  
Xuemei Wang ◽  
Biao Wu ◽  
Xiujun Sun ◽  
Qing Zhao ◽  
...  
Keyword(s):  
Intertidal Zone ◽  
Karyological Analysis

scholarly journals New Transbaikalian finds of the Muja Valley vole (Rodentia: Cricetidae: Alexandromys mujanensis)

2018 ◽  
Vol 322 (3) ◽  
pp. 357-384 ◽  
Keyword(s):  
Detailed Analysis ◽  
Shape Analysis ◽  
Nature Reserve ◽  
Molecular Genetic ◽  
Gene Tree ◽  
Cytb Gene ◽  
Experimental Hybridization ◽  
Karyological Analysis ◽  
Far Eastern ◽  
Different Parts

The Muja vole, Alexandromys mujanensis Orlov et Kovalskaya, 1975, was described in the result of the karyological analysis and experimental hybridization. Since the first description the Muja vole has been considered to inhabit only the Muja Valley. Some Far Eastern voles were collected in 2013 and 2014 from the Dzherginsky Nature Reserve of the Barguzin Valley (Dzhirga sample), and the Baunt Lake vicinity (Baunt sample) (Transbaikalia, Buryatia). The species from these geographic localities were identified by use of karyotypic and cytb-gene analyses. On the cytb-gene tree these voles are in the same clade with Muja voles from the type locality (the Muja Valley). The karyotype of the vole from Barguzin Valley corresponds to that previously described for the Muja voles (Meyer et al. 1996). According to the result of the shape analysis of m1 occlusal surface the sample from the Baunt Valley includes two species – A. mujanensis and A. maximowiczii. Unless more detailed analysis of the material from the different parts of the Baunt Valley is carried out, we suppose it to be inhabited by three species – A. maximowiczii, A. mujanensis, and according to the data from literature – A. oeconomus. So far as some molecular-genetic differences between Muja voles from the Dzhirga and Baunt Lake vicinity were found, the experiments on hybridization between them were set. The F1 hybridization between them were fertile. A. mujanensis taxonomic position and terms of its origination are discussed.

Cytological and molecular analysis of annual species of the genus Medicago

1996 ◽  
Vol 74 (2) ◽  
pp. 299-307 ◽  
Author(s):  
A. Mariani ◽  
F. Pupilli ◽  
O. Calderini
Keyword(s):  
Chromosome Number ◽  
Molecular Analysis ◽  
Genetic Relationship ◽  
Diploid Species ◽  
Rflp Analysis ◽  
Molecular Study ◽  
Annual Species ◽  
Genetic Affinity ◽  
Karyological Analysis ◽  
Medicago Rugosa

Medicago rugosa and M. scutellata, two annual species of the genus Medicago, have aroused considerable interest because they carry useful traits that could be introduced into alfalfa and have a chromosome number (2n = 30) that is quite unusual in Medicago. A cytogenetic and molecular study was undertaken to investigate the annual diploid species with 2n = 16 and 2n = 14 that seem to be the most closely related to M. rugosa and M. scutellata, with the aim of characterizing these diploid species and determining their genetic relationship with the species with 2n = 30. Karyological analysis established that some of the diploid species investigated were more similar than the others to both M. rugosa and M. scutellata (as in the case of M. intertexta, M. rotata, and M. polymorpha) or at least to one of those two species (as was the case with M. doliata, M. muricoleptis, and M. murex). RFLP analysis identified four species, namely M. intertexta and M. muricoleptis with 2n = 16, and M. polymorpha and M. murex with 2n = 14, as having the highest degree of genetic affinity with the two species with 30 chromosomes. These findings suggest the possibility of identifying the ancestors of M. rugosa and M. scutellata among those four species and therefore of verifying the probable allopolyploid origin of the two species in question. Keywords: Medicago, annual species, karyotypes, RFLPs.

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