Spermatogonial Budding in Fleabeetles

Virkki, Niilo

doi:10.1080/00087114.1973.10796554

Cited by 12 publications

(2 citation statements)

References 16 publications

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“…In (Begossi, 1988;Bruner et al, 1975;Virkki, 1972Virkki, , 1973Virkki, , 1979Virkki, , 1980Virkki, , 1982Virkki & Zambrana, 1983;Virkki, Santiago-Blay, & Clark, 1992;Wolcott, , 1951. Additionally, Virkki (1980) (Ballou, 1936).…”

Section: Nigricornisunclassified

Host plants of leaf beetle species occurring in the United States and Canada (Coleoptera: Megalopodidae, Orsodacnidae, Chrysomelidae, excluding Bruchinae)

Reid

2005

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Section: Nigricornisunclassified

Host plants of leaf beetle species occurring in the United States and Canada (Coleoptera: Megalopodidae, Orsodacnidae, Chrysomelidae, excluding Bruchinae)

Reid

2005

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“…Spermatocyte divisions in flea-beetle species including Alagoasa (Oedionychus) bicolor and Omophoita cyanipennis have several unique features described in some detail by Virkki (Virkki, 1970;Virkki, 1971;Virkki, 1972;Virkki, 1973;Virkki, 1985;Virkki, 1990). He described meiotic cells with ten small autosomal bivalents and two large univalent sex chromosomes, X and Y.…”

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Microtubule distribution during meiosis I in flea-beetle[Alagoasa(Oedionychus)] spermatocytes: evidence for direct connections between unpaired sex chromosomes

Wilson

Forer

Wise

2003

Journal of Cell Science

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The meiosis-I spindle in flea-beetle spermatocytes is unusual in that the autosomes and univalent sex chromosomes are separated by a mitochondrial sheath and move polewards at different times. To help understand the basis for this interesting chromosome behaviour, and to gather more detailed information about it, we studied microtubule distributions throughout meiosis I using immunofluorescence and confocal microscopy, and took careful measurements of pole and kinetochore positions at all stages of division. Our results show that, by late prophase, there is a spindle-shaped cytoplasmic array of microtubules in the central part of the cell, with the nucleus at the periphery. Following nuclear envelope breakdown, both autosomes and sex chromosomes become associated with cytoplasmic microtubules, although only the autosomes move centrally to the `cytoplasmic spindle'. The two unpaired sex chromosomes remain at the cell periphery and appear to be connected to each other by a microtubule bundle extending between their kinetochores. These bundles often persist into anaphase. Analysis of measurements taken from fixed/stained cells supports previous observations that sex chromosomes move part way to the pole in early prometaphase and then stop. The measurements also suggest that during autosomal anaphase, spindle elongation precedes autosome movement to the poles and polewards movement of sex chromosomes is limited or absent when autosomes are moving polewards.

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