Female meiosis during oocyte maturation in Eyprepocnemis plorans (Orthoptera: Acrididae)

Henriques‐Gil, Nuno; Jones, Gareth R.; Cano, M I; Arana, P.; Santos, Juan Luis

doi:10.1139/g86-011

Cited by 19 publications

(12 citation statements)

References 7 publications

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“…When the eggs are laid, the oocyte is arrested at metaphase I, and meiosis is continued outside the female's body, being completed by about 3-4 h later (Henriques-Gil et at., 1986). As female meiosis is completed after laying, the spermatozoon has necessarily to be inside the egg when homologous chromosomes separate in anaphase I.…”

Section: Resultsmentioning

confidence: 99%

Evidence for B chromosome drive suppression in the grasshopper Eyprepocnemis plorans

et al. 1996

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The grasshopper Eyprepocnemis plorans is polymorphic for both a B chromosome and a heterochromatic segment of chromatin on the smallest autosome. Females transmit these to their offspring more frequently after copulating with a male from a population without Bs than after copulating with a male from their own population. Paternity analyses using the heterochromatic segment as a marker showed that the effect of male on female transmission does not depend on fertilization because it occurs even when all the eggs are fertilized by sperm from another mating. The possible mechanisms include behavioural differences in mating and transfer of substances affecting female meiosis in male ejaculate. The data support the idea that the B chromosome is initially subject to meiotic drive in populations in which it has not previously existed, and that genes which suppress this drive are then selected.

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Section: Resultsmentioning

confidence: 99%

Evidence for B chromosome drive suppression in the grasshopper Eyprepocnemis plorans

et al. 1996

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“…testes, ovarioles, and gastric caecum in adults and 10-day-old embryos. The absence of intraindividual variation for the number of B chromosomes in these body parts indicates that these Bs are mitotically stable [Camacho et al, 1980;Henriques-Gil et al, 1986]. However, what happens in the rest of the body parts remained unknown.…”

Section: Discussionmentioning

confidence: 99%

B Chromosomes in the Grasshopper Eyprepocnemis plorans Are Present in All Body Parts Analyzed and Show Extensive Variation for rDNA Copy Number

Ruiz-Estévez¹,

Cabrero²,

Camacho³

et al. 2014

Cytogenet Genome Res

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B chromosomes in the grasshopper Eyprepocnemis plorans are considered to be mitotically stable, because all meiotic (primary spermatocytes and oocytes) or mitotic (embryos, ovarioles, and gastric caecum) cells analyzed within the same individual show the same B chromosome number. Nothing is known, however, about body parts with somatic tissues with no mitotic activity in adult individuals, constituting the immense majority of their body. Therefore, we investigated whether B chromosomes are present in 8 non-mitotically active somatic body parts from both sexes in addition to ovarioles and testes by PCR analysis of 2 B-specific molecular markers. We also elucidated the number of B chromosomes that an individual carried through quantifying the B-located rDNA copy number by qPCR. Our results indicated the amplification of both B-specific markers in all analyzed body parts. However, we found high variation between males for the estimated number of rDNA units in the B chromosomes. These results demonstrate the presence of B chromosomes in all body parts from the same individual and suggest a high variation in the rDNA content of the B chromosomes carried by different individuals from the same population, presumably due to unequal crossovers during meiosis.

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“…This facilitates the analysis of first prophase using the squash technique. To analyze metaphase chromosomes, and further meiotic stages, the technique developed by Perry & Jones (1974) as modified by Hewitt (1976) and Henriques-Gil et al (1986), is necessary.…”

Section: Discussionmentioning

confidence: 99%

Males vs. female meiotic prophase in a grasshopper, Arcyptera microptera (Orthoptera: Acridiae)

1990

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Female and male first meiotic prophase are analyzed in the grasshopper Arcyptera microptera with special reference to the heteropycnotic chromatin. Differences in the behaviour of the megameric and X-chromosomes, in nuclear size and in the response to C-banding treatment are described. The evidence for a distinctive meiotic prophase in both sexes is compared with results obtained in other species of grasshoppers by other authors using more advanced stages. The discussion centers around the role of the diffuse stage and the differential behaviour of the Xchromosome in the two sexes.

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Female meiosis during oocyte maturation in Eyprepocnemis plorans (Orthoptera: Acrididae)

Cited by 19 publications

References 7 publications

Evidence for B chromosome drive suppression in the grasshopper Eyprepocnemis plorans

Evidence for B chromosome drive suppression in the grasshopper Eyprepocnemis plorans

B Chromosomes in the Grasshopper <b><i>Eyprepocnemis plorans</i></b> Are Present in All Body Parts Analyzed and Show Extensive Variation for rDNA Copy Number

Males vs. female meiotic prophase in a grasshopper, Arcyptera microptera (Orthoptera: Acridiae)

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