Description
| - Four European species of spined loaches were identified as parental species of asexually reproducing di-, tri- and tetraploid hybrid clones. The karyotypes of these species differ remarkably: Cobitis taenia (2n = 48 karyotype, 5 metacentrics (M)+10 submetacentrics (SM)+9 subtelocentrics-acrocentrics (ST-A), one M characteristically larger than others), C. elongatoides (2n=50, 15M + 8SM +1ST+1A), C.tanaitica (2n=50,6M+13SM+6ST-A), C.spec. Crymea (2n=50, 5M+15SM+4ST+1A, two M distincly larger). Furthemore, each species expresses a specific polymorphism, i.e. presence/ absence of NOR sites, in which two chromosome pairs (C. taenia, short arms of middle-sized ST and SM) or three (C. elongatoides, middle-sized M, SM, large SM; C. tanaitica, middle-sized SM, two large ST; C.spec. Crymea, middle-sized SM, two large ST) are involved. Some ribosomal sites were CMA 3-negative suggesting that they were not associated with GC-rich DNA heterochromatin. Reversely, each parental genome also contains numerous GC-ri
- Four European species of spined loaches were identified as parental species of asexually reproducing di-, tri- and tetraploid hybrid clones. The karyotypes of these species differ remarkably: Cobitis taenia (2n = 48 karyotype, 5 metacentrics (M)+10 submetacentrics (SM)+9 subtelocentrics-acrocentrics (ST-A), one M characteristically larger than others), C. elongatoides (2n=50, 15M + 8SM +1ST+1A), C.tanaitica (2n=50,6M+13SM+6ST-A), C.spec. Crymea (2n=50, 5M+15SM+4ST+1A, two M distincly larger). Furthemore, each species expresses a specific polymorphism, i.e. presence/ absence of NOR sites, in which two chromosome pairs (C. taenia, short arms of middle-sized ST and SM) or three (C. elongatoides, middle-sized M, SM, large SM; C. tanaitica, middle-sized SM, two large ST; C.spec. Crymea, middle-sized SM, two large ST) are involved. Some ribosomal sites were CMA 3-negative suggesting that they were not associated with GC-rich DNA heterochromatin. Reversely, each parental genome also contains numerous GC-ri (en)
- Čtyři evropské druhy sekavců byly identifikovány jako rodičovské druhy asexuálně se reprodukujících di-, tri- a tetraploidních hybridních klonů. Karyotypy těchto druhů se značně liší: Cobitis taenia (2n = 48: 5 metacentrických /M/ + 10 submetacentrických /SM/ +9 subtelocentrických-akrocentrických /ST-A/ chromozómů, jeden M charakteristicky větší než ostatní), C. elongatoides (2n = 50, 15 M + 8SM +1ST+1A), C. tanaitica (2n= 50, 6M + 13SM + 6ST-A), C. spec. Crymea (2n = 50, 5M + 15SM + 4ST + 1A, dva M znatelně větší). Dále každý druh exprimuje specifický polymorfismus, tj. přítomnost/absenci NOR míst, zahrnujících dva chromozómové páry (C.taenia, krátká raménka středně velkých ST a SM) nebo tři (C.elangatoides, středně velké M, SM, velké SM; C.tanaitica, středně velké SM, dva velké ST; C. spec. Crymea, středně velké SM, dva velké ST). Některé ribozomální oblasti byly CMA 3-negativní a lze předpokládat, že nebyly asociovány s GC-bohatým DNA heterochromatinem. Naopak, každý rodičovský genom také obsahova (cs)
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