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Meiosis in rare males in parthenogenetic Cacopsylla myrtilli (Wagner, 1947) (Hemiptera, Psyllidae) populations from northern Europe
Tekijät: Nokkala C, Kuznetsova VG, Nokkala S
Kustantaja: ZOOLOGICAL INST
Julkaisuvuosi: 2013
Journal: Comparative Cytogenetics
Tietokannassa oleva lehden nimi: COMPARATIVE CYTOGENETICS
Lehden akronyymi: COMP CYTOGENET
Numero sarjassa: 3
Vuosikerta: 7
Numero: 3
Aloitussivu: 241
Lopetussivu: 251
Sivujen määrä: 11
ISSN: 1993-0771
DOI: https://doi.org/10.3897/CompCytogen.v7i3.6126
Verkko-osoite: http://www.pensoft.net/journals/compcytogen/article/6126/abstract/meiosis-in-rare-males-in-parthenogenetic-cacopsylla-myrtilli-wagner-1947-hemiptera-psyllidae-
Tiivistelmä
For studying meiosis in males, large samples of Cacopsylla myrtilli (Wagner, 1947) (Hemiptera, Psyllidae) were collected in Norway, Sweden, Finland and northwest Russia. In addition to all-female populations, males were present in 10 out of 47 populations; still, all populations were highly female-biased, the proportion of males varying from 0.1% to 9.1%. These males are thus rare or so-called spanandric males. Males in northern Norway, Finland and northwest Russia showed normal chiasmate meiosis, while complete absence of chiasmata due to asynapsis was found in males collected in Norway and northern Sweden. In asynaptic meiosis, all univalent chromosomes divided during the first meiotic division resulting in incomplete second meiotic division and formation of diploid sperms. Hence, males in these populations are nonfunctional and do not contribute to the genetic constitution of the population, but appear in every generation as reversals from apomictic parthenogenesis and the mode of parthenogenesis is of obligatory type.
For studying meiosis in males, large samples of Cacopsylla myrtilli (Wagner, 1947) (Hemiptera, Psyllidae) were collected in Norway, Sweden, Finland and northwest Russia. In addition to all-female populations, males were present in 10 out of 47 populations; still, all populations were highly female-biased, the proportion of males varying from 0.1% to 9.1%. These males are thus rare or so-called spanandric males. Males in northern Norway, Finland and northwest Russia showed normal chiasmate meiosis, while complete absence of chiasmata due to asynapsis was found in males collected in Norway and northern Sweden. In asynaptic meiosis, all univalent chromosomes divided during the first meiotic division resulting in incomplete second meiotic division and formation of diploid sperms. Hence, males in these populations are nonfunctional and do not contribute to the genetic constitution of the population, but appear in every generation as reversals from apomictic parthenogenesis and the mode of parthenogenesis is of obligatory type.
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