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- 주제어 : asymmetry karyotype (검색결과 1 건)
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Karyotypic Study on Some Populations of Thymus migricus Klokov & Desj.-Shost.
Alireza Yavari,Vahideh Nazeri,Fatemeh Sefidkon,Mohammad Esmail Hassani 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.2
Five populations of Thymus migricus Klokov & Desj.-Shost., which is endemic to Flora Iranica area, were studied karyologically. Included in the data set were the basic chromosome number, the ploidy level, the total length of the haploid chromosome complement (TLC) and five different measures of karyotype asymmetry. The basic chromosome number of the studied populations was obtained as x = 14. The presence of 28 chromosomes in Heris, Nazloo and Band populations and 56 chromosomes in Jolfa and Ghushchi populations corresponds to diploidy (2n = 2x = 28) and tetraploidy (2n = 4x = 56) levels, respectively. The size of mitotic chromosomes was very small and the mean length varied from 0.69 to 1.42 μm. The smallest chromosomes were observed in Ghushchi population and the largest in Heris population. Jolfa population had the largest total chromosome length and Nazloo population had the smallest value. In all populations, metacentric chromosomes were the most common whereas sub-metacentric chromosomes were rare. Karyotypic indices obtained for five populations revealed that the karyotypes were slightly asymmetrical. A1 index varied from 0.492 to 0.643, interchromosomal asymmetry index (A₂) ranged between 0.020 and 0.102 and Paszko’s asymmetry index (AI) ranged from 0.07 to 0.20. Heris and Jolfa populations were considered to indicate higher levels of karyotypic heterogeneity.
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