The structure of the holocentric chromosomes of the rosy apple aphid, Dysaphis plantaginea (2n = 12), and pear-grassaphid, Melanaphis pyraria (2n = 8), was studied using C-banding, NOR, Giemsa and fluorochrome staining, and fluorescent in situhybridization (FISH). Contrary to the equilocal distribution of heterochromatin typical of monocentric chromosomes, in both species C-banding evidenced a tendency of highly repetitive DNAs to be restricted to the X chromosomes. Silver staining and FISH, using a 28S rDNA probe, located rDNA genes on one telomere of each X chromosome, the only brightly fluorescent C-positive sites revealed by CMA3 staining, whereas all other heterochromatic C-bands were DAPI positive. Both species showed a noticeable amount of rDNA heteromorphism. Mitotic recombination is proposed as a possible mechanism responsible for the variation in size of rDNA.
Anno di pubblicazione: | 2009 |
Titolo: | Distribution of heterochromatin and rDNA on the holocentric chromosomes of the aphids Dysaphis plantaginea and Melanaphis pyraria (Hemiptera: Aphididae) |
Autore/i: | ANGELA CRINITI; GABRIELE SIMONAZZI; STEFANO CASSANELLI; MARIO FERRARI; DAVIDE BIZZARO; GIAN CARLO MANICARDI. |
Autore/i UNIMORE: | |
Rivista: | |
Volume: | 106 |
Pagina iniziale: | 153 |
Pagina finale: | 157 |
Codice identificativo ISI: | WOS:000265937900001 |
Codice identificativo Scopus: | 2-s2.0-69949185959 |
Citazione: | Distribution of heterochromatin and rDNA on the holocentric chromosomes of the aphids Dysaphis plantaginea and Melanaphis pyraria (Hemiptera: Aphididae) / ANGELA CRINITI; GABRIELE SIMONAZZI; STEFANO CASSANELLI; MARIO FERRARI; DAVIDE BIZZARO; GIAN CARLO MANICARDI.. - In: EUROPEAN JOURNAL OF ENTOMOLOGY. - ISSN 1210-5759. - STAMPA. - 106(2009), pp. 153-157. |
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