Meiotic Anomalies in Hybrids between Wheat and Apomictic Elymus rectisetus (Nees in Lehm.) A. Löve & Connor

Crop Science ◽  
1997 ◽  
Vol 37 (3) ◽  
pp. 717-723 ◽  
Author(s):  
Michael D. Peel ◽  
John G. Carman ◽  
Zhi Wu Liu ◽  
Richard R. ‐C. Wang
Keyword(s):  
Meiotic Anomalies

scholarly journals Karyological and cytogenetic features of conifers in arboretums and parklands

2020 ◽  
Vol 27 ◽  
pp. 299-302
Author(s):  
T. S. Sedel'nikova ◽  
A. V. Pimenov ◽  
E. N. Muratova
Keyword(s):  
Chromosomal Rearrangements ◽  
Green Spaces ◽  
Chromosome Research ◽  
Geographical Regions ◽  
Wide Range ◽  
Cytogenetic Studies ◽  
Growing Conditions ◽  
Recreational Pressure ◽  
Mitosis And Meiosis ◽  
Meiotic Anomalies

Aim. The study of karyological and cytogenetic features of conifers growing under conditions of introduction and increased recreational pressure, to identify biodiversity and solve the problems of population and environmental genetics of representatives of this group of plants. Methods. Classical chromosome research methods with staining with acetohematoxylin were used. Results. In species, forms, and cultivars of conifers from the Pinaceae and Cupressaceae families growing in arboretums and parklands, as well as being components of green spaces in settlements of different geographical regions, variability of chromosome numbers (mixoploidy), the appearance of B chromosomes, high occurrence, and a wide range of chromosomal and meiotic anomalies are discovered. Conclusions. Karyological and cytogenetic studies have shown the presence of karyotypic polymorphism and an increase in the number of various disorders of mitosis and meiosis in conifers when introduced under growing conditions in recreational areas. Keywords: conifers, introduction, chromosome number, chromosomal rearrangements, meiosis disorders.

Identification of meiotic anomalies with multiplex fluorescence in situ hybridization: Preliminary results

2004 ◽  
Vol 82 (3) ◽  
pp. 712-717 ◽  
Author(s):  
Zaida Sarrate ◽  
Joan Blanco ◽  
Susana Egozcue ◽  
Francesca Vidal ◽  
Josep Egozcue
Keyword(s):  
In Situ Hybridization ◽  
Fluorescence In Situ Hybridization ◽  
Preliminary Results ◽  
Meiotic Anomalies

scholarly journals Meiotic anomalies in infertile men with severe spermatogenic defects

2005 ◽  
Vol 20 (7) ◽  
pp. 1897-1902 ◽  
Author(s):  
M.R. Guichaoua ◽  
J. Perrin ◽  
C. Metzler-Guillemain ◽  
J. Saias-Magnan ◽  
R. Giorgi ◽  
...  
Keyword(s):  
Infertile Men ◽  
Meiotic Anomalies

Latent Meiotic Anomalies Related to an Ancestral Exposure to a Mutagenic Agent

Science ◽  
1971 ◽  
Vol 172 (3979) ◽  
pp. 171-174 ◽  
Author(s):  
K. S. Lavappa ◽  
G. Yerganian
Keyword(s):  
Mutagenic Agent ◽  
Meiotic Anomalies

EMS, sodium azide and gamma rays induced meiotic anomalies in Delphinium malabaricum (Huth) Munz

2013 ◽  
Vol 61 (1-4) ◽  
pp. 64-72 ◽  
Author(s):  
Firdose R. Kolar ◽  
Sandeep R. Pai ◽  
Ghansham B. Dixit
Keyword(s):  
Gamma Rays ◽  
Sodium Azide ◽  
Pollen Sterility ◽  
Chromosomal Anomalies ◽  
Multinucleated Cells ◽  
Meiotic Configuration ◽  
Mother Cells ◽  
Higher Doses ◽  
Chromatin Bridges ◽  
Meiotic Anomalies

Meiotic cell division is a dynamic cellular process controlled by a large number of genes that act from premeiotic to postmeiotic mitosis. Mutation in these genes may cause anomalies that impair plant fertility. In this study, an attempt has therefore been made to understand the effects of ethyl methane sulfonate (EMS), sodium azide (SA) and gamma rays on the meiotic configuration of Delphinium malabaricum. The results demonstrated that the mutagens cause various types of cytological aberrations, such as univalents, chromatin bridges, laggards, fragments, stickiness and multinucleated cells. The maximum aberrations were found at higher doses/concentrations of the mutagens. The highest percentage of pollen mother cells showing abnormalities was induced by EMS followed by gamma rays and SA. The mutagen impact on chromosomal anomalies increased the frequency of pollen sterility.

scholarly journals Radiocytogenetical studies on Capsicum. I. Meiotic anomalies.

CYTOLOGIA ◽  
1978 ◽  
Vol 43 (2) ◽  
pp. 415-421 ◽  
Author(s):  
R. B. Katiyar
Keyword(s):  
Meiotic Anomalies

scholarly journals Meiotic behaviour and morpho-phenological variation in cut stock (Matthiola incana L.) flower

2017 ◽  
Vol 29 (1) ◽  
pp. 51-61 ◽  
Author(s):  
Sepideh Famil Irani ◽  
Mostafa Arab
Keyword(s):  
Genetic Background ◽  
Basic Chromosome Number ◽  
Meiotic Abnormalities ◽  
Matthiola Incana ◽  
Additional Chromosome ◽  
Diakinesis Stage ◽  
Different Genetic Background ◽  
A Chain ◽  
First Time ◽  
Meiotic Anomalies

AbstractMorpho-phenological and meiotic studies were performed in twelve cultivars of Matthiola incana. All of the cultivars were diploid (2n = 2x = 14) with basic chromosome number x = 7. A number of aneuploid PMCs (n + 1) were observed in plants of two cultivars, named ‘Nobel’ (NB) and ‘Goddess’ (GD), at the diakinesis stage. Trisomic individuals with the frequency of 20% and 5% and (2n + 1 = 15) somatic chromosomes were observed in seeds obtained from single-flowered plants of the cultivars NB and GD, respectively. An additional chromosome was mostly observed in the form of a chain trivalent or a rod univalent. Various meiotic abnormalities were found in all the cultivars to different degrees. In these cultivars, the percentage of cells with meiotic abnormalities was higher in anaphase I. Cytomixis was observed for the first time in Matthiola incana. ANOVA tests revealed significant differences in morpho-phenological characteristics. ‘Nobel’ differs from the others in all of the vegetative features investigated in this study. All the cultivars studied except ‘Nobel’ and ‘Pacific Crimson’ possessed high pollen fertility (> 90%). Five groups of the cultivars based on morpho-phenological features disagree with the clustering of cultivars based on meiotic traits. It is thought that the various morpho-phenological features observed among the cultivars could be due to their different genetic background and not only to meiotic anomalies.

DESYNAPSIS IN PISUM SATIVUM INDUCED THROUGH GENE MUTATION

1971 ◽  
Vol 13 (1) ◽  
pp. 138-143 ◽  
Author(s):  
W. Gottschalk ◽  
S. R. Baquar
Keyword(s):  
Pisum Sativum ◽  
Gene Mutation ◽  
Chromosome Numbers ◽  
Recessive Gene ◽  
Meiotic Behaviour ◽  
Extreme Position ◽  
Extrinsic Factors ◽  
Severe Reduction ◽  
Meiotic Anomalies

A mutant of Pisum sativum showing various meiotic anomalies was isolated from X-irradiated material. These irregularities are due to a severe reduction of chiasmata frequency in pachytene resulting in univalent formation in the following meiotic stages. The action of this recessive gene shows considerable variations from PMC to PMC. As a consequence of this behaviour a large number of microspores is produced in each PMC having different chromosome numbers. The mutant is completely sterile in both sexes. Only very negligible differences were noted in the meiotic behaviour of this mutant in subsequent generations demonstrating that the action of gene ds82A is not influenced by extrinsic factors. It has been demonstrated that mutant 82A attains an extreme position in the scheme as compared with other desynaptic genotypes.

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