کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2203629 1100512 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The spermatogenesis and oogenesis of the springtail Podura aquatica Linné, 1758 (Hexapoda: Collembola)
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
پیش نمایش صفحه اول مقاله
The spermatogenesis and oogenesis of the springtail Podura aquatica Linné, 1758 (Hexapoda: Collembola)
چکیده انگلیسی

Podura aquatica is a springtail of uncertain systematic position. Our study dealing with the ultrastructure of the spermatogenesis and oogenesis of this species is a contribution to a better knowledge of both the reproduction and the systematics of the taxon. In the male, the spermatogenesis proceeds in a similar way to that of other Collembola. Primary spermatocytes do not show synaptonemal complexes which, instead, are found in primary oocytes. Thus a genomic recombination seems to be present only in females, as it occurs in other springtails. Degeneration of secondary spermatocytes, as reported in some families of the Symphypleona, was not observed in P. aquatica. At the end of spermiogenesis, a rolled up sperm cell provided with an anterior long appendage adhering to the acrosome is produced. In the female, the oogenesis also proceeds in a conventional way with the production of eggs rich in yolk. A branched spermatheca is present at the end of the common oviduct, close to the genital opening. It contains many sperm in its lumen. Contrary to the globular appearance of sperm cells in the male genital ducts, in the spermatheca they are straight, elongated, and lack the long anterior appendage. P. aquatica shows a spermatogenesis, sperm structure, and oogenesis similar to those of other Collembola. In agreement with the results of recent phylogenetic studies, we confirm that P. aquatica is a member of Poduridae, and it does not belong to a group close to the Symphypleona.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tissue and Cell - Volume 45, Issue 3, June 2013, Pages 211–218
نویسندگان
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