Cytogenetic studies on natural populations of grasshoppers with special reference to B-chromosomes

Sannomiya, Masanobu

doi:10.1007/bf00372576

Cited by 11 publications

(3 citation statements)

References 13 publications

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“…Most studies of the phenotypic effects of Bs in the wild have been conducted in species with relatively low B numbers (for a review, see Jones & Rees, 1982). Although species with a high number of Bs have been reported ( Sannomiya, 1974; Carter, 1978) the phenotypic effects of Bs have not been studied.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the phenotypic effects of B chromosomes in a natural population of Metagagrella tenuipes (Arachnida: Opiliones)

Gorlov

Tsurusaki

2000

Heredity

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Phenotypic effects of B chromosomes in a natural population of Metagagrella tenuipes (Arachnida: Opiliones) were studied. Mean number of Bs per individual in the population studied was 6.0, and remained stable during two successive summers of 1997 and 1998. In contrast to the number of B chromosomes, ratios between individuals possessing odd and those possessing even numbers of Bs changed during both collection seasons: the proportion of harvestmen with an even number of Bs decreased from June-July to October-November. A possible reason for this may be a difference in susceptibility to parasites between B-odd and B-even harvestmen. In the group of B-even individuals the percentage of infected harvestmen in the June-July samples was much higher compared to the B-odd group. In addition, the infection rate in the B-even group decreased more sharply than among B-odd harvestmen. In the group of B-even harvestmen infection was associated with reduced body size, whereas no such association was found among B-odd harvestmen. In the group of B-even individuals there was a U-shaped relationship between number of Bs and the probability of being infected by parasites, and an inverted-U-shaped relationship between body size and number of Bs. No such associations were found in the group of B-odd harvestmen. Seasonal selection is suggested to be a main factor contributing to the B-chromosome polymorphism in M. tenuipes.

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Section: Introductionmentioning

confidence: 99%

Analysis of the phenotypic effects of B chromosomes in a natural population of Metagagrella tenuipes (Arachnida: Opiliones)

Gorlov

Tsurusaki

2000

Heredity

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“…Peters (1981) argued that the polysomic system he described in Atractomorpha similis could easily have been mistakenly described as an unstable B-chromosome system which has been held to be present in the related Japancse species A. bedeli (Sannomiya, 1973). It is important therefore to distinguish between these two mechanisms for producing interfollicular variation in chromosome number.…”

Section: Discussionmentioning

confidence: 99%

The chromosome system in three species of the genus Arcyptera II. Unstable B-chromosomes in A. fusca (Pall.)

López‐Fernández

Gosálvez

1983

Genetica

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Different populations of the grasshopper Arcypterafusca located through a small valley of the Pyrenees present an unstable B-chromosome system. Frequencies of individuals carrying Bs ranged from 11% to 50%. In the testes of these males the number of Bs varied among the different follicles ranging from 0 to 4 with 2 being the number most commonly found. The variation in the number of supernumeraries probably resulted from their preferential non-disjunction in the earl3; mitosis prior to the differentiation of the follicles.The meiotic behaviour of Bs depends on their number within each follicle. When two or more Bs are present they usually pair and segregate regularly; B univalents divide in anaphase I and segregate without further division in anaphase II in 75% of the cells observed.The presence of Bs does not affect the chiasma frequency, however, the males with Bs had fewer follicles in their testes; this event could be related with the non-existence of follicles with more than 4 Bs.

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“…This is partially related to the poor degree of karyological study of Pyrgomorphidae grasshoppers. The karyotypes of only about 30 species are known from tropical and subtropical regions of the Old World (Makino 1951, Sannomiya 1973; Nankivell 1976, John and King 1983, Fossey et al 1989, Williams and Ogunbiyi 1995, Seino et al 2013, Seino and Dongmo 2015). The vast majority of species have a 19-chromosome karyotype, but a few species have been shown to have a different karyotype, resulting from one, two or three Robertsonian translocations (White 1973, Fossey et al 1989).…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of chromosomal localization of ribosomal and telomeric DNA markers in three species of Pyrgomorphidae grasshoppers

Buleu

Jetybayev

Bugrov

2017

CCG

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The karyotypes of three species of Pyrgomorphidae grasshoppers were studied: Zonocerus elegans (Thunberg, 1815), Pyrgomorpha guentheri (Burr, 1899) and Atractomorpha lata (Mochulsky, 1866). Data on karyotypes of P. guentheri and Z. elegans are reported here for the first time. All species have karyotypes consisting of 19 acrocentric chromosomes in males and 20 acrocentric chromosomes in females (2n♂=19, NF=19; 2n♀=20, NF=20) and X0/XX sex determination system. A comparative analysis of the localization of C-heterochromatin, clusters of ribosomal DNA, and telomere repeats revealed inter-species diversity in these cytogenetic markers. These differences indicate that the karyotype divergence in the species studied is not associated with structural chromosome rearrangements, but with the evolution of repeated DNA sequences.

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Cytogenetic studies on natural populations of grasshoppers with special reference to B-chromosomes

Cited by 11 publications

References 13 publications

Analysis of the phenotypic effects of B chromosomes in a natural population of Metagagrella tenuipes (Arachnida: Opiliones)

Analysis of the phenotypic effects of B chromosomes in a natural population of Metagagrella tenuipes (Arachnida: Opiliones)

The chromosome system in three species of the genus Arcyptera II. Unstable B-chromosomes in A. fusca (Pall.)

Comparative analysis of chromosomal localization of ribosomal and telomeric DNA markers in three species of Pyrgomorphidae grasshoppers

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