Chromosome variation in Anatolian species of Nonea Medik. (Boraginaceae), with special reference to endemics and N. persica

Autor:	Federico Selvi, Massimo Bigazzi
Rok vydání:	2003
Předmět:	Nonea B chromosome Taxon biology Sympatric speciation Botany Genetics Chromosome Boraginaceae Ploidy General Agricultural and Biological Sciences Endemism biology.organism_classification
Zdroj:	Caryologia. 56:509-519
ISSN:	2165-5391 0008-7114
DOI:	10.1080/00087114.2003.10589364
Popis:	The chromosome complements of five Anatolian species of Nonea Medik., N. intermedia, N. macrantha, N. stenosolen, N. caspica and N. persica, were analysed with traditional staining methods. All except N. persica are invariably diploid taxa, but the first two are based on x = 10, while N. stenosolen and N. caspica on x = 9 and x = 8, respectively. N. persica includes diploid races with 2n = 18 and, more rarely, 2n = 20. Inter- and intrapopulational variation in base number occurs in this polymorphic species (x = 10 and x = 9). Several individuals from the Kars province showed aneusomaty, e.g. co-occurrence in the same root meristem of cells with 2n =19/18 and more rarely 2n = 20/19. The latter number (19) possibly originates through centric fusion of two regular chromosomes. In addition N. persica includes tetraploids and, rarely, hexaploids with 2n = 36 and 2n = 54, respectively. In East Anatolia polyploids are sympatric with diploids, suggesting that they have a polytopic and recurrent formation...
Databáze:	OpenAIRE
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