אסיף מאגר המחקר החקלאי

Karyotypes and sex determination of ten species of phytoseiid mites (acarina: Mesostigmata)

Year:

1968

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Volume :

39

Co-Authors:

Wysoki, M., Division of Entomology, The Volcani Institute of Agricultural Research, Bet Dagan, Israel
Swirski, E., Division of Entomology, The Volcani Institute of Agricultural Research, Bet Dagan, Israel

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Abstract:

The chromosomal picture was studied on early cleayage divisiona of 10 phytoseiid mites, using the aceto-orcein smear technique. Eggs of 9 species have either a haploid (4) or a diploid (8) number of chromosomes:Amblyseius rubini Swirski & Amitai, A. swirskii Athias, A. hibisci Chant, A. ohilenensis (Dosse), A. largoensis (Muma), Typhlodromus athiasae Porath and Swirski T. rhenanus (Oud.) sensu latiore, Phytoseiulus persimilis Athias, and I phiseius degeneraus (Berlese). Typhlodromus oceidentalis Nesbitt has 3 and 6 chromosomes. In sections and smears of post embryonic stages belonging to mites representative of the four genera, a haploid number was found in males, whereas in females somatic cells contained 2n and ovaries n as well as 2n. Thus it is shown that sex is determined by the haplo-diploid (arrhenotokous) mechanism. Males differ from females in the structure of the interphase nuclei belonging to the central nervous system. © 1968 Martinus Nijhoff.

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