Chromosome numbers and breeding systems in some species of Hieracium subgen. Pilosella from Central Europe

Title:

Chromosome numbers and breeding systems in some species of Hieracium subgen. Pilosella from Central Europe
Počty chromozomů a způsoby reprodukce vybraných druhů jestřábníků (Hieracium subgen. Pilosella) ze střední Evropy

Creator:

Rotreklová, Olga, Krahulcová, Anna, Vaňková, Danuše, Peckert, Tomáš, and Mráz, Patrik

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:897fa35d-8171-e44c-032a-9ac0b9dc448f
uuid:897fa35d-8171-e44c-032a-9ac0b9dc448f

Subject:

Compositae, karyology, ploidy level, reproduction mode, Czech Republic, Slovakia, Poland, Slovenia, Germany, Hungary, Austria, and Ukraine

Type:

article and TEXT

Description:

Chromosome numbers are given for 16 taxa (and one interspecific hybrid) of Hieracium subgen. Pilosella originating from Central Europe: H. apatelium Nägeli et Peter (2n = 45), H. aurantiacum L. (2n = 36), H. bauhini Besser (2n = 36, 45, 54), H. brachiatum Bertol. ex DC. (2n = 45, 48, 63, 72), H. densiflorum Tausch (2n = 36), H. echioides Lumn. (2n = 18, 27, 36), H. floribundum Wimm. et Grab. (2n = 36, 45), H. glomeratum Froel. (2n = 36, 45), H. guthnickianum Hegetschw. (2n = 54), H. lactucella Wallr. (2n = 18), H. onegense (Norrl.) Norrl. (2n = 18), H. pilosella L. (2n = 36, 45, 54), H. piloselliflorum Nägeli et Peter (2n = 36, 45), H. piloselloides Vill. (2n = 36), H. rothianum Wallr. (2n = 36), H. schultesii F. W. Schultz (2n = 45), and the hybrid H. floribundum × H. aurantiacum (2n = 36). New chromosome numbers are reported for H. brachiatum and H. floribundum. The octoploid cytotype (2n = 72), recorded in H. brachiatum, is the highest ploidy level ever found in plants from the subgen. Pilosella originating from the field. Aneuploidy, rare in this subgenus in Europe, occurs in this hybridogenous species as well: it was recorded in one plant (2n = 48) collected in a hybrid swarm H. pilosella × H. bauhini. The breeding system in H. bauhini, H. brachiatum, H. densiflorum, H. echioides, H. pilosella, H. piloselloides, and H. rothianum was studied. The sexual reproduction of pentaploid H. pilosella is a new observation: it means an increase of diversity in possible reproduction modes of those cytotypes having odd chromosome numbers.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/

Source:

Preslia | 2002 Volume:74 | Number:1

Harvested from:

CDK

Metadata only:

false