RT Journal Article
T1 Nucleolus size varies with sex, ploidy and gene dosage in insects
A1 Montiel-Jiménez, Eugenia Elisabeth
A1 Manrique-Poyato, María Inmaculada
A1 Rocha-Sánchez, Sonia María
A1 López-León, María Dolores
A1 Cabrero-Hurtado, Josefa
A1 Perfectti-Álvarez, Francisco
A1 Martínez-Camacho, Juan Pedro
K1 Nucléolo
AB The nucleolus constitutes a cytologically visible phenotype for ribosomal DNA (rDNA).Nucleolar size, as determined by silver staining, is a good indicator of cell proliferationrate and biosynthetic activity. Nevertheless, the relationship between rDNA content andsexual dimorphism for nucleolar size is not well documented.In the present work, theimpact of sex and ploidy level on nucleolar size is investigated in three haplo/diploidand three diplo/diploid species of insect. Nucleolar sizes are found to be proportional toploidy level in the haplo/diploid hymenopterans Trypoxylon albitarse and Nasoniavitripennis. Conversely, in the ant Messor barbarus, nucleolar sizes are larger in haploidmales (winged) than diploid females (apterous). Among the diplo/diploid species,evidence for gene dosage compensation on nucleolar activity is suggested by theabsence of sex differences in Drosophila simulans, a species in which rDNA is limitedto the X chromosome. By contrast, in the grasshopper Stenobothrus festivus, anotherspecies with rRNA genes restricted to the X chromosome, the size of the nucleolus issignificantly larger in females than in males. Additionally, in the grasshopperChorthippus parallelus, where rDNA is distributed evenly on several autosomes ofmales and females, the females also show larger nucleoli than males. In bothgrasshopper species, the magnitude of the female/male ratio for nucleolus area is verysimilar to the body size ratio, suggesting that body size, as well as sex, ploidy, genedosage and physiological activity may be an important determinant of nucleolus area.
PB Wiley
YR 2012
FD 2012
LK https://hdl.handle.net/10630/34095
UL https://hdl.handle.net/10630/34095
LA eng
NO MONTIEL, E.E., MANRIQUE-POYATO, M.I., ROCHA-SÁNCHEZ, S.M., LÓPEZ-LEÓN, M.D., CABRERO, J., PERFECTTI, F. and CAMACHO, J.P.M. (2012), Nucleolus size varies with sex, ploidy and gene dosage in insects. Physiological Entomology, 37: 145-152. https://doi.org/10.1111/j.1365-3032.2011.00822.x
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026