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Karyological studies on four endemic iris spp section iris in turkey

Karyological studies on four endemic iris spp section iris in turkey

Istanbul Universitesi Eczacilik Fakultesi Mecmuasi 25: 1-16

A total of 100 individuals of the four endemic Iris species (Sect. Iris) in Turkey were examined karyologically. The individuals were collected from 11 natural populations. The edemics are I. junonia Schott et Kotschy ex Schott,I. purpureobractea B. Matthew et T.Baytop, I. taochia Woronow ex Grossh., and I. schachtii Markgarf. The chromosome numbers of these speices have been found as follows: I. junonia 2n=4x=48; I. purpureobractea 2n=2x=24 2n=4x=48, 2n=4x+1=49 2n=6x=72; I. taochia 2n=2x=24; I. schachtii 2n=4x=48. No difference was found in the morphology of the chromosomes among the species, except I. taochia. Two kinds of metacetric marker chromosomes were observed in the karyotypes of these three species, a large one in No I, a smaller one in No II. However, only a pair of metacentric marker chromosomes were found in the karyotype of I. taochia in No I. There were variations within the populations of all the species examined regarding the chromosome types, satellite number and size, heteromorphy between homologous chromosomes, and the number and place of secondary constrictions. I. purpureobractea was decided to be a complex species in terms of karyology and plant morphology. Except for the chromosome number of I. junonia, the chromosome counts and the karyotype analyses of all the species examined were reported here for the first time.

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