Evolutionary cytogenetics of Aedine mosquitoes

S., K.

doi:10.1007/bf00121838

Cited by 12 publications

(4 citation statements)

References 41 publications

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“…some genes are switched on and others switched off. Variability in the C-bands affected by gene regulation has also been established in the metaphase chromosomes of inter-species hybrids from the genus Aedes (Rai, 1980). This change in gene regulation is probably based on the integration of different genomes.…”

Section: Discussionmentioning

confidence: 86%

C-banding in the polytene chromosomes of species of the plumosus group (Diptera, Chironomidae) and their experimental hybrids

Michailova

1987

Genetica

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The localization and amount of heterochromatin in the plumosus group were studied, including the species Chironomus plumosus L., C. vancouveri and C. balatonicus. The appearance of C bands of Chironomus plumosus in several European populations is traced. The role of the C heterochromatkn in the differentiation of this species is discussed. From the evolutionary point of view the Swiss populations, in which large centromere heterochromatin blocks have been discovered, are more varied as to the amount of heterochromatin. The importance of duplications for this process is pointed out. The chromosomes of the individuals from C. vancouveri and C. balatonicus have centromeric, telomeric and interstitial heterochromatin. The centromeric heterochromatin is represented by thin C-bands. The particularities in the appearance of C heterochromatin in C. vancouveri and C. balatonicus reflect the structural peculiarities of their chromosomes. The change in the euchromatin regions in these forms is discussed in the light of transformation of euchromatin to heterochromatin in the process of evolution.The appearance of heterochromatin in hybrids (between populations and between species) created experimentally is traced. A change has been discovered in the appearance of heterochromatin in the hybrids compared to the initial parent forms. This difference is expressed more strongly in inter-species hybrids than in interpopulation hybrids of C. plumosus.

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Section: Discussionmentioning

confidence: 86%

C-banding in the polytene chromosomes of species of the plumosus group (Diptera, Chironomidae) and their experimental hybrids

Michailova

1987

Genetica

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“…Most species so far studied are characterised by a small pair of metacentric chromosome and two pairs of larger metacentric or submetacentric chromosomes. However, careful measurements of chromosomal arms, giemsa Cbanding studies, meiotic analyses of species hybrids and linkage map comparisons have shown the existence of individual differences among the karyotypes of various species (Rai, 1980;Dev and Rai, 1984;Sherron and Rai, 1984;Rao and Rai, 1987). The uniformity in the chromosome number and yet the worldwide distribution and habitat diversity of various species, make Aedes an interesting genus to study the extent of changes in nuclear DNA amount and its possible evolutionary role.…”

Section: Introductionmentioning

confidence: 99%

Inter and intraspecific variation in nuclear DNA content in Aedes mosquitoes

Rao

1987

Heredity

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Haploid nuclear DNA of 23 species of Aedes, as determined by Feulgen cytophotometry, was found to vary 3-fold. This was accompanied by a 2-fold variation in total chromosomal length. There was a significant correlation (r = 9765, P< 0.001) between these two parameters. Genome size varied from 0-87 pg to 1-3 pg among 10 strains of Aedes albopictus, from wide geographic regions. Large scale differences in chromosomal DNA amounts have accompanied speclation and evolution in aedine mosquitoes.

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“…Crossing experiments with A. polynesiensis have given rise to a number of contradictory results. For instance, Macdonald (1976), Rai (1980) and Tesfa-Yohannes & Rozeboom (1974) found A. polynesiensis and A. s. malayensis almost incompatible in both directions, whilst Tesfa-Yohannes & Rozeboom (1974) (using a second stock of A. polynesiensis) and Trpis et al (1981a) found that A. polynesiensis males were compatible with A. s. malayensis females. Similarly, whilst Hoyer & Rozeboom (1977) found that the cross between A. cooki and A. polynesiensis was only successful when A. polynesiensis was the male parent, Macdonald (1976) reported the reverse.…”

Section: Introductionmentioning

confidence: 99%

Crossing relationships among seven members of the group ofAedes scutellaris(Walker) (Diptera: Culicidae)

Meek

Macdonald

1984

Bull. Entomol. Res.

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A rickettsia-free (aposymbiotic) stock of Aedes polynesiensis Marks (POLY-A) was crossed with (a) three symbiont-infected stocks of A. polynesiensis (POLY-S from Samoa and POLY-N and POLY-T from Fiji), (b) A. pseudoscutellaris (Theo.) (PSE) from Fiji, (c) A. alcasidi Huang (ALC), A. scutellaris katherinensis Woodhill (KATH), A. s. malayensis Colless (MAL) and A. s. scutellaris (Wlk.) (SCUT), which occur to the west of Fiji and (d) an aposymbiotic stock of A. cooki Belkin (CO) from Niue. It was bidirectionally compatible with CO, but in all other crosses compatibility was high when POLY-A was the male parent and very low when it was the female parent. Backcross data suggested that the crossing type was maternally inherited. ALC and KATH were bidirectionally compatible; both were virtually incompatible with POLY-S and PSE, compatible with SCUT when the latter was the female parent, and compatible with CO when the latter was the male parent. POLY-S females were moderately compatible with a third Fijian stock of A. polynesiensis (POLY-V), and POLY-N and POLY-V were compatible with PSE. If, as in Culex pipiens L., rickettsia-like symbionts are responsible for cytoplasmic incompatibility, then aposymbiotic males should cross successfully with symbiont-infected females, whereas the reciprocal cross should be unsuccessful. Since PSE, MAL and SCUT contain symbionts, their crossing relationships are consistent with the hypothesis. However, ALC and KATH appear to be aposymbiotic and their crossing relationships conflict with the hypothesis. There is little evidence of behavioural barriers to mating between species, but whereas male hybrids of two eastern species were capable of normal insemination, male hybrids between western and eastern species gave very low insemination rates. The egg-hatch rates from backcrosses of female hybrids between western and eastern species to the parents were reduced.

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Evolutionary cytogenetics of Aedine mosquitoes

Cited by 12 publications

References 41 publications

C-banding in the polytene chromosomes of species of the plumosus group (Diptera, Chironomidae) and their experimental hybrids

C-banding in the polytene chromosomes of species of the plumosus group (Diptera, Chironomidae) and their experimental hybrids

Inter and intraspecific variation in nuclear DNA content in Aedes mosquitoes

Crossing relationships among seven members of the group ofAedes scutellaris(Walker) (Diptera: Culicidae)

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