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Genome size of the northern walkingstick, Diapheromera femorata (Phasmida: Heteronemiidae)

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Abstract:

The haploid genome size (C value) of the northern walkingstick, Diapheromera femorata (Say), was estimated to be 1C = 2.55 pg using Feulgen image-analysis densitometry of haemocyte and sperm nuclei. This relatively large genome is similar in size to the genomes of the few other phasmids studied so far, and is consistent with hypotheses regarding an upper limit to the size of many insect genomes imposed by the process of metamorphosis, which is relaxed among hemimetabolous orders. Comments on sperm morphology in D. femorata are also provided, and another possible relationship between genome size and the organismal phenotype in insects is suggested.

La taille du génome haploïde (valeur de C) du phasme Diapheromera femorata (Say) a été estimée à 1C = 2,55 pg par analyse densitométrique d'images Feulgen des noyaux des hémocytes et des spermatozoïdes. Cette taille relativement élevée du génome est semblable à celles des génomes de quelques autres phasmides déjà étudiés et s'accorde avec les hypothèses sur la limite supérieure de la taille du génome de plusieurs insectes, limite imposée par le processus de métamorphose qui est moins contraignant chez les ordres d'hémimétaboles. On trouvera ici quelques commentaires sur la morphologie des spermatozoïdes de D. femorata qui soulignent la possibilité d'une relation entre la taille du génome et le phénotype organismique chez les insectes.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2002-07-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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