caa a22 4500 475806980 CHVBK 20180406123749.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/BF01089296 doi (NATIONALLICENCE)springer-10.1007/BF01089296 The evolution of the ribosomal loci in the subgenus Leopoldia of the genus Muscari (Hyacinthaceae) [Elektronische Daten] [N. Cuñado, R. De la Herrán, J. Santos, C. Rejón, M. Garrido-Ramos, M. Rejón] In the subgenusLeopoldia of the genusMuscari, M. comosum is an exceptional species because it presents the most asymmetrical karyotype of the group and because its only active NOR is located in the fifth chromosome pair, while in the other species it is located in the first or second chromosome pairs (all the species have 2n = 18 chromosomes). SinceM. comosum has a derived karyotype different from those of the other species of the group, the resulting question is whether, in the first and second chromosome pair of this species, ribosomal cistrons persist. Observations after fluorescence in situ hybridization (FISH) using rDNA probes indicate that there are indeed ribosomal loci in the first and second chromosome pairs of this species, although these loci are inactive with respect to nucleolus organization. The location of rDNA regions in another three species of the same genus (M. atlanticum, M. dionysicum andM. matritensis) provides a basis for examining the significance of these findings in relation to the evolution of the ribosomal loci in this genus. Our observations indicate that in the genusMuscari, the largest sites for rRNA genes are not necessarily active, and, therefore, the activation of these regions is not related to the number of copies but to a specific regulation mechanism. Springer-Verlag, 2000 In situ hybridization nationallicence evolution nationallicence NOR nationallicence rDNA nationallicence Muscari nationallicence Cuñado N. Departamento de Genética, Facultad de Biología, Universidad Complutense, E-28040, Madrid, Spain aut De la Herrán R. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut Santos J. Departamento de Genética, Facultad de Biología, Universidad Complutense, E-28040, Madrid, Spain aut Rejón C. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut Garrido-Ramos M. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut Rejón M. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut Plant Systematics and Evolution Springer-Verlag 221/3-4(2000-09-01), 245-252 0378-2697 221:3-4<245 2000 221 606 https://doi.org/10.1007/BF01089296 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01089296 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cuñado N. Departamento de Genética, Facultad de Biología, Universidad Complutense, E-28040, Madrid, Spain aut NATIONALLICENCE 700 1- De la Herrán R. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut NATIONALLICENCE 700 1- Santos J. Departamento de Genética, Facultad de Biología, Universidad Complutense, E-28040, Madrid, Spain aut NATIONALLICENCE 700 1- Rejón C. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut NATIONALLICENCE 700 1- Garrido-Ramos M. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut NATIONALLICENCE 700 1- Rejón M. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 221/3-4(2000-09-01), 245-252 0378-2697 221:3-4<245 2000 221 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer