scholarly journals Cytogenetic characterization of a triploid mulberry (Morus spp.) cultivar Suvarna-2

2018 ◽  
Vol 7 (4) ◽  
pp. 2156
Author(s):  
Daryoush Shafiei ◽  
Basavaiah Prof.
Keyword(s):  
South India ◽  
Pollen Sterility ◽  
Meiotic Behavior ◽  
Pollen Mother Cells ◽  
Cytogenetic Characterization ◽  
Morus Spp ◽  
Mother Cells ◽  
High Degree

Mulberry exehibits a high degree of polyploidy ranging from haploidy to docosaploidy and its various species are being cultivated for foliage to practice sericulture and edible fruits. Triploid mulberries for sericulture porpuse and higher polyploids are proved to be superior.  The cultivar Suvarna-2 is an improved high leaf yielding triploid in south India. The meiotic behavior of this cultivar has been presented here. Meiosis was highly irregular. Various anomalies such as univalent, bivalents, trivalent, hexavalent, loose association, unequal separation and precocious movement of chromosomes and laggards have been observed in pollen mother cells. These irregularities prevented the formation of viable gamete that leads to pollen sterility.

scholarly journals Isolation and Characterization of a Novel Nuclear Protein from Pollen Mother Cells of Lily

1990 ◽  
Vol 94 (3) ◽  
pp. 1467-1471 ◽  
Author(s):  
Yoh Sasaki ◽  
Hideyo Yasuda ◽  
Yoshiki Ohba ◽  
Hiroshi Harada
Keyword(s):  
Nuclear Protein ◽  
Pollen Mother Cells ◽  
Isolation And Characterization ◽  
Mother Cells

scholarly journals Cytogenetic characterization of Aloysia virgata Ruiz and Pavan (Verbenaceae)

2009 ◽  
Vol 52 (4) ◽  
pp. 893-899
Author(s):  
Aline Dias Brandão ◽  
Lyderson Facio Viccini ◽  
Shirlei Maria Recco-Pimentel
Keyword(s):  
Interphase Nucleus ◽  
5S Rdna ◽  
Nucleolar Organizer ◽  
Nucleolar Organizer Regions ◽  
Meiotic Behavior ◽  
Meiotic Analysis ◽  
Chromosomal Pair ◽  
Cytogenetic Characterization

Since previous cytogenetic reports of Aloysia have only described the meiotic behavior and chromosomal number of some species, the aim of this work was to provide detailed cytogenetic description of Aloysia virgata that would contribute to the understanding of the taxonomical organization of the Verbenaceae. Aloysia virgata had a karyotype with 2n = 36 metacentric chromosomes, all with similar size. The large amount of heterochromatin seen after Giemsa staining was confirmed by C-banding. Four nucleolar organizer regions (NORs) were detected with an rDNA 45S probe in two homologous pairs and two sites of 5S rDNA located on one chromosomal pair were detected by fluorescence in situ hybridization. The interphase nucleus was classified as semi-reticulate. Meiotic analysis showed a normal chromosomal behavior, with 18 bivalents in some parts of prophase I and in metaphase I. The number of chromosomes, NORs and 5S rDNA segments did not exclude a possible polyploid origin.

Progenies of Thinopyrum elongatum × Agropyron mongolicum

Genome ◽  
1987 ◽  
Vol 29 (5) ◽  
pp. 738-743 ◽  
Author(s):  
Richard R-C. Wang
Keyword(s):  
Embryo Rescue ◽  
Chromosome Elimination ◽  
Root Tip ◽  
Hybrid Necrosis ◽  
Genome Chromosome ◽  
Pollen Mother Cells ◽  
Close Phylogenetic Relationship ◽  
Mother Cells ◽  
Thinopyrum Elongatum ◽  
High Degree

With the aid of embryo rescue, both a monoploid and several hybrids were obtained from the cross Thinopyrum elongatum × Agropyron mongolicum. The monoploid was a result of gradual and eventually complete elimination of A. mongolicum chromosomes in the hybrid. About 95% of the root-tip cells, and nearly all of the pollen mother cells, had only the seven chromosomes of the Je genome of the maternal parent. Very little autosyndesis occurred between chromosomes within the Je genome. Extensive chromosome pairings were observed in one headed hybrid, averaging 6.42 I + 2.53 rod II + 0.85 ring II + 0.25 III + 0.02 IV at metaphase I in pollen mother cells, which revealed a high degree of chromosome homology between the two genomes and thus justifying the close phylogenetic relationship between the two species. All plants died from hybrid necrosis, some as seedlings and some after heading. The Je and P genomes in the accessions used in this study carry complementary genes for hybrid necrosis. Key words: hybrid (intergeneric), haploid, genome, chromosome elimination, meiosis.

scholarly journals Morphological, Cytological and Embryological Characterization of F1 A. cepa × A. roylei Hybrids

2015 ◽  
Vol 57 (2) ◽  
pp. 98-105 ◽  
Author(s):  
Alicja Chuda ◽  
Karolina Kłosowska ◽  
Adela Adamus
Keyword(s):  
Female Gametophyte ◽  
Parental Species ◽  
Pollen Viability ◽  
Plant Morphology ◽  
Morphological Characters ◽  
Tetrad Stage ◽  
Pollen Mother Cells ◽  
Developmental Disturbances ◽  
Mother Cells

Abstract In the previous study we obtained a population of interspecific F1 A. cepa × A. roylei hybrids. In this study, in comparison to the parental species: A. cepa and A. roylei, the F1 hybrids were evaluated in terms of plant morphology, pollen viability, microsporogenesis and female gametophyte. Most of the morphological characters of the F1 hybrids were intermediate as compared to those of both parental accessions. In pollen mother cells (PMCs) of the F1 hybrids abnormalities were observed in meiosis as well as at the tetrad stage. Pollen viability of F1 A. cepa × A. roylei hybrids was reduced to 30.1%. In the F1 hybrids, 45.8% of the analyzed ovules showed developmental disturbances, whereas in 26.7% of the ovules necrotic processes were observed.

Meiotic behavior of pollen mother cells in relation to ploidy level of somatic hybrids between Solanum tuberosum and S. chacoense

2010 ◽  
Vol 29 (11) ◽  
pp. 1277-1285 ◽  
Author(s):  
Xianpu Guo ◽  
Conghua Xie ◽  
Xingkui Cai ◽  
Botao Song ◽  
Li He ◽  
...  
Keyword(s):  
Solanum Tuberosum ◽  
Ploidy Level ◽  
Somatic Hybrids ◽  
Meiotic Behavior ◽  
Pollen Mother Cells ◽  
Mother Cells

Ultrastructural characterization of the cytoplasmic channel formation between pollen mother cells of David lily

Caryologia ◽  
2002 ◽  
Vol 55 (2) ◽  
pp. 161-169 ◽  
Author(s):  
Xin Yu Wang ◽  
Xiu Wan Nie ◽  
Guang Qin Guo ◽  
You Fu Pan ◽  
Guo Chang Zheng
Keyword(s):  
Channel Formation ◽  
Pollen Mother Cells ◽  
Cytoplasmic Channel ◽  
Ultrastructural Characterization ◽  
Mother Cells

scholarly journals The Development and Meiotic Behavior of Asymmetrical Isochromosomes in Wheat

Genetics ◽  
1997 ◽  
Vol 145 (4) ◽  
pp. 1155-1160
Author(s):  
Adam J Lukaszewski
Keyword(s):  
Triticum Aestivum ◽  
Hexaploid Wheat ◽  
Triticum Aestivum L ◽  
Meiotic Metaphase ◽  
Meiotic Behavior ◽  
Pollen Mother Cells ◽  
Chromosome Arm ◽  
Mother Cells ◽  
Metaphase I

To determine which segments of a chromosome arm are responsible for the initiation of chiasmate pairing in meiosis, a series of novel isochromosomes was developed in hexaploid wheat (Triticum aestivum L.). These isochromosomes are deficient for different terminal segments in the two arms. It is proposed to call them “asymmetrical.” Meiotic metaphase I pairing of these asymmetrical isochromosomes was observed in plants with various doses of normal and deficient arms. The two arms of an asymmetrical isochromosome were bound by a chiasma in only two of the 1134 pollen mother cells analyzed. Pairing was between arms of identical length whenever such were available; otherwise, there was no pairing. However, two arms deficient for the same segment paired with a frequency similar to that of normal arms, indicating that the deficient arms retained normal capacity for pairing. Pairing of arms of different length was prevented not by the deficiency itself, but rather, by the heterozygosity for the deficiency. Whether two arms were connected via a centromere in an isochromosome or were present in two different chromosomes had no effect on pairing. This demonstrates that in the absence of homology in the distal regions of chromosome arms, even if relatively short, very long homologous segments may remain unrecognized in meiosis and will not be involved in chiasmate pairing.

Characterization of RF Sputtered ZnO Piezoelectric Films Using Transmission Electron Microscope

1975 ◽  
Vol 33 ◽  
pp. 86-87
Author(s):  
Kemining W. Yeh ◽  
Richard S. Muller ◽  
Wei-Kuo Wu ◽  
Jack Washburn
Keyword(s):  
Integrated Circuit ◽  
Acoustic Waves ◽  
New Technology ◽  
Surface Acoustic Waves ◽  
Electromechanical Properties ◽  
Leading Role ◽  
Saw Devices ◽  
Transmission Electron ◽  
High Degree

Considerable and continuing interest has been shown in the thin film transducer fabrication for surface acoustic waves (SAW) in the past few years. Due to the high degree of miniaturization, compatibility with silicon integrated circuit technology, simplicity and ease of design, this new technology has played an important role in the design of new devices for communications and signal processing. Among the commonly used piezoelectric thin films, ZnO generally yields superior electromechanical properties and is expected to play a leading role in the development of SAW devices.

Clinical and molecular cytogenetic characterization of two cases of inverted duplication deletion 8p

2020 ◽  
pp. 41-42
Author(s):  
Д.А. Юрченко ◽  
М.Е. Миньженкова ◽  
Е.Л. Дадали ◽  
Н.В. Шилова
Keyword(s):  
Mental Retardation ◽  
Congenital Heart ◽  
Heart Defects ◽  
Clinical Manifestations ◽  
Formation Mechanisms ◽  
Agenesis Of Corpus Callosum ◽  
Molecular Cytogenetic ◽  
Inverted Duplication ◽  
Cytogenetic Characterization

Синдром инвертированной дупликации короткого плеча хромосомы 8 со смежной терминальной делециенй (inv dup del(8p), ORPHA 96092) - редкая хромосомная аномалия (ХА) с частотой 1/10000-1/30000 живорожденных. В статье представлены клинические и молекулярно-цитогенетические характеристики двух неродственных пациентов с синдромом inv dup del(8p) и уточнены механизмы формирования хромосомного дисбаланса. Inverted duplication deletion 8p syndrome (inv dup del(8p), ORPHA 96092) is a rare chromosomal abnormality with a frequency of 1:10,000 - 30,000 newborns. Clinical manifestations of this syndrome include mental retardation, facial anomalies, hypoplasia/agenesis of corpus callosum, scoliosis and/or kyphosis, hypotonia, congenital heart defects. The article presents the clinical and molecular cytogenetic characteristics of two patients with inv dup del (8p) syndrome and clarifies the formation mechanisms.

Sign in / Sign up

Export Citation Format

Share Document