Chromosome numbers and karyotypes of Allium przewalskianum populations

• Autorzy: Ao C.
• Języki publikacji: EN

Abstrakty

EN

In this study, somatic chromosome counts were determined in 302 individuals from 43 Allium przewalskianum populations; 90 were diploids (2n = 16, 16 + 1B, 16 + 2B) and 212 were tetraploids (2n = 32). Of the 43 populations, five were selected for karyotype analysis. Among them, the diploid plants have two karyotypes: 2n = 2x = 14m + 2st (2SAT) and 2n =2x = 8m + 6sm + 2st (2SAT). The tetraploid has one: 2n = 4x = 28m + 4st. Mixoploidy, Robertsonian translations, and B chromosomes were reported for the first time. In combination with previous chromosome data, the present study reveals a uniform basic chromosomal number (x = 8) and uniformity of karyotypes (Stebbins's 2A type), indicating that speciation through polyploidization is less likely in A. przewalskianum, despite the highly diversified habitats it occupies.

Słowa kluczowe

EN

Allium przewalskianum; diploid; tetraploid; herb; plant population; China; chromosome number; Qinghai-Tibet Plateau; karyotype; population diversification; B chromosome; habitat; polyploidization

• Wydawca: -
• Czasopismo: Acta Biologica Cracoviensia. Series Botanica
• Rocznik: 2008
• Tom: 50
• Numer: 1
• Opis fizyczny: p.43-49,fig.,ref.

Twórcy

autor

Ao C.

• Key Laboratory of Arid and Grassland Ecology of the Ministry of Education, Lanzhou University, Lanzhou 730000, China

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