Tesmin transcription is regulated differently during male and female meiosis

2003 ◽  
Vol 67 (1) ◽  
pp. 116-126 ◽  
Author(s):  
Christian Olesen ◽  
Morten Møller ◽  
Anne Grete Byskov
Keyword(s):  
Female Meiosis ◽  
Male And Female

Immunocytochemical visualization of the centromeres during male and female meiosis in Lilium longiflorum

Chromosoma ◽  
1997 ◽  
Vol 106 (7) ◽  
pp. 435-445 ◽  
Author(s):  
Tadzunu Suzuki ◽  
Noriko Ide ◽  
Ichiro Tanaka
Keyword(s):  
Lilium Longiflorum ◽  
Female Meiosis ◽  
Male And Female

scholarly journals Male and Female Meiosis in Nicotiana tabacum L.

CYTOLOGIA ◽  
2004 ◽  
Vol 69 (3) ◽  
pp. 285-289 ◽  
Author(s):  
Kuldeep K. Koul ◽  
Ranjna Nagpal
Keyword(s):  
Nicotiana Tabacum ◽  
Female Meiosis ◽  
Male And Female ◽  
Nicotiana Tabacum L

Recombination in male and female meiocytes contrasted

1977 ◽  
Vol 277 (955) ◽  
pp. 227-233 ◽  
Keyword(s):  
Chiasma Frequency ◽  
Male Meiosis ◽  
Comparative Data ◽  
Evolutionary Significance ◽  
Female Meiosis ◽  
Male And Female ◽  
Intrachromosomal Recombination ◽  
Male Side ◽  
Chromosomal Recombination

For technical reasons studies of chiasma frequency and distribution, and hence of intrachromosomal recombination, have mostly been confined to male meiosis. However, there is now sufficient comparative data on male and female meiosis, in both plants and animals, to show that the extent of intra-chromosomal recombination in some organisms may be much the same on the female as on the male side, whereas other organisms show extreme sexual divergence in this regard. The evolutionary significance of such diversity remains enigmatic

Synaptic mutants in potato, Solanum tuberosum L. III. Effect of the Ds-1/ds-1 locus (desynapsis) on genetic recombination in male and female meiosis

Genome ◽  
1991 ◽  
Vol 34 (1) ◽  
pp. 121-130 ◽  
Author(s):  
E. Jongedijk ◽  
R. C. B. Hutten ◽  
J. M. A. S. A. van der Wolk ◽  
S. I. J. Schuurmans Stekhoven
Keyword(s):  
Genetic Recombination ◽  
Solanum Tuberosum L ◽  
2N Gametes ◽  
Potato Seed ◽  
Genetic Constitution ◽  
True Potato Seed ◽  
Female Meiosis ◽  
Recombination Rates ◽  
Male And Female ◽  
Tetraploid Progeny

By applying half-tetrad analysis to segregating tetraploid progeny that had been raised from 2x–4x and 2x–2x crosses, five marker loci (ym, y, Got-1, Got-2, and ds-1) were mapped to their respective centromeres in male and female meiosis of both normal synaptic and desynaptic (ds-1ds-1) diploid potato clones. Significant sex differences in genetic recombination for these loci did not occur in either normal plants or desynaptic mutants, which suggests that genetic exchange in both the sexes is governed by the same control system. In desynaptic mutants a severe reduction in crossing-over was observed for ym and.y (83.7 an 90.0% reduction, respectively), whereas recombination rates for Got-2 appeared to have systematically, although not significantly, increased. The ds-1 gene was concluded to substantially reduce the overall chiasma frequency and to differentially alter chiasma distribution along individual chromosomes. Based on segregation ratios in progeny from different types of testcrosses, first division restitution (FDR) and second division restitution (SDR) 2n gametes formed by normal synaptic plants were estimated to transmit on average about 82.7 and 36.1 %, respectively, of the parental heterozygosity to tetraploids. With desynapsis the average amount of heterozygosity transmitted by FDR 2n gametes amounted to 94.1%. SDR 2n gametes from desynaptic mutants are sterile as a result of aneuploidy. The ds-1 gene was demonstrated to particularly enhance the ability of FDR 2n gametes to preserve the genetic constitution of diploid parental clones with a minimum amount of reassortment. The potential value and limitations of the ds-1 gene for the production of true potato seed varieties and the experimental induction of diplosporic apomixis are discussed.Key words: Solanum, genetic markers, gene–centromere mapping, desynapsis, reduced recombination.

scholarly journals The effect of heat stress on sugar beet recombination

2020 ◽  
Author(s):  
Mikel Arrieta ◽  
Glenda Willems ◽  
Jérôme DePessemier ◽  
Isabelle Colas ◽  
Alexandra Burkholz ◽  
...  
Keyword(s):  
Heat Stress ◽  
Sugar Beet ◽  
Meiotic Recombination ◽  
Crossover Frequency ◽  
Female Meiosis ◽  
Male And Female ◽  
Breeding Programmes ◽  
Genomic Regions ◽  
Breeding And Genetics ◽  
Potential Use

Abstract Meiotic recombination plays a crucial role in plant breeding through the creation of new allelic combinations. Therefore, lack of recombination in some genomic regions constitutes a constraint for breeding programmes. In sugar beet, one of the major crops in Europe, recombination occurs mainly in the distal portions of the chromosomes, and so the development of simple approaches to change this pattern is of considerable interest for future breeding and genetics. In the present study, the effect of heat stress on recombination in sugar beet was studied by treating F1 plants at 28 °C/25 °C (day/night) and genotyping the progeny. F1 plants were reciprocally backcrossed allowing the study of male and female meiosis separately. Genotypic data indicated an overall increase in crossover frequency of approximately one extra crossover per meiosis, with an associated increase in pericentromeric recombination under heat treatment. Our data indicate that the changes were mainly induced by alterations in female meiosis only, showing that heterochiasmy in sugar beet is reduced under heat stress. Overall, despite the associated decrease in fertility, these data support the potential use of heat stress to foster recombination in sugar beet breeding programmes.

scholarly journals Recombination suppression in heterozygotes for a pericentric inversion induces interchromosomal effect on crossovers in Arabidopsis

2018 ◽  
Author(s):  
Pasquale Termolino ◽  
Matthieu Falque ◽  
Gaetana Cremona ◽  
Rosa Paparo ◽  
Antoine Ederveen ◽  
...  
Keyword(s):  
Pericentric Inversion ◽  
Molecular Mechanisms ◽  
Male Meiosis ◽  
The Other ◽  
Chromosome 3 ◽  
Female Meiosis ◽  
Recombination Suppression ◽  
Strong Suppression ◽  
Heterozygous Condition ◽  
Male And Female

AbstractDuring meiosis, recombination ensures the allele exchange through crossovers (COs) between the homologous chromosomes and, additionally, their proper segregation. CO events are under a strict control but molecular mechanisms underlying CO regulation are still elusive. Some advances in this field were made by structural chromosomal rearrangements that are known at heterozygous state to impair COs in various organisms. In this paper, we have investigated the effect that a large pericentric inversion involving chromosome 3 of Arabidopsis thaliana has on male and female recombination. The inversion associated to a T-DNA dependent mutation likely resulted from a side effect of the T-DNA integration. Reciprocal backcross populations, each consisting of over 400 individuals, obtained from the T-DNA mutant and the wild type, both crossed with Landsberg, have been analyzed at genome-wide level by 143 SNPs. We found a strong suppression of COs in the rearranged region in both male and female meiosis. As expected, we did not detect single COs in the inverted region consistently with the post-meiotic selection operating against unbalanced gametes. Cytological analysis of chiasmata in F1 plants confirmed that COs are effectively dropping in chromosome 3 pair. Indeed, CO failure within the inversion is not altogether counterbalanced by CO increase in the regions outside the inversion on chromosome 3. Strikingly, this CO suppression induces a significant increase of COs in chromosome pairs 1, 2 and 5 in male meiosis. We conclude that these chromosomes acquire additional COs thereby compensating the recombination suppression occurring in chromosome 3, similarly to what has been described as interchromosomal (IC) effect in other organisms. In female meiosis, IC effect is not evident. This may be related to the fact that CO number in female is close to the minimum value imposed by the obligatory CO rule.Author SummaryIt is well known that chromosome structure changes in heterozygous condition influence the pattern of meiotic recombination at broad scale. In natural populations, inversions are recognized as the most effective force to reduce COs. In this way, adaptive allele combinations which otherwise would be broken by recombination are maintained. In the present work, we studied the effect on recombination of a large pericentric inversion involving Arabidopsis chromosome 3. The analysis on heterozygous populations provided evidence of strong recombination suppression in chromosome 3. However, the most striking aspect of this study is the finding that the failure of chromosome 3 to recombine is coupled to increased CO frequencies on the other chromosome pairs in male meiosis. These CO compensatory increases are strictly an interchromosomal (IC) effect as was first described in Drosophila. As far as we know, it is the first time IC effect has been reported in plants. Unfortunately, the molecular mechanisms underlying IC effect in the other organisms are still elusive. To understand how a CO change on just one chromosome triggers the global response of the meiocyte to obtain the adequate CO number/cell remains a fascinating question in sexually reproducing species.

Inversion heterozygosity in females of the newt Notophthalmus viridescens and its influence on chiasma distribution

1977 ◽  
Vol 24 (1) ◽  
pp. 131-141
Author(s):  
S.E. Hartley ◽  
H.G. Callan
Keyword(s):  
Synaptonemal Complex ◽  
Chiasma Frequency ◽  
Wild Population ◽  
Paracentric Inversion ◽  
Notophthalmus Viridescens ◽  
Lampbrush Chromosomes ◽  
Female Meiosis ◽  
Male And Female ◽  
Recombination Nodules ◽  
Chiasma Distribution

In a wild population of the American newt Notophthalmus viridescens 15 females out of a total of 94 were found to be heterozygous for a paracentric inversion which includes almost the whole of the longer arm of the smallest chromosome (XI). The inversion was recognized in preparations of lampbrush chromosomes because it transfers the sequential loops, which normally lie close to the telomere, to a position neighbouring the centromere. Because of inversion the transcriptional polarity of the sequential loops is reversed vis-a—vis the chromosome as a whole. In normal bivalents XI (both in male and female meiosis) each arm pair generally forms a single chiasma close to the telomeres (proterminal localization). In bivalents XI heterozygous for the inversion no chiasmata are formed between the mutually inverted longer arm pairs, presumably because they fail to synapse, but chiasma frequency in the non-inverted shorter arm pairs is increased, and the normal restraint on chiasma distribution in this arm pair is lifted. An explanation is offered in terms of the availability of recombination nodules, and the time of their association with the synaptonemal complex.

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