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:: Volume 1, Issue 1 (2014) ::
pgr 2014, 1(1): 65-76 Back to browse issues page
Investigation of Thymus spp. Karyotypic Diversity in Different Regions of Iran
Valiollah Yousefi , Abdollah Najaphy , Alireza Zebarjadi * , Hooshmand Safari
Associate Professor, Department of Agronomy and Plant Breeding, Campus of Agriculture and Natural Resources, Razi University, Kermanshah
Abstract:   (22942 Views)
Thymus, an aromatic medicinal plant, is a well-known, perennial and woody herb from Lamiaceae family. Thymus is taxonomically a very complex genus with a high frequency of hybridization and introgression among sympatric species, and some species of this herb are endemic to Iran. In the present study, in order to identification genetic variability in this medicinal plant seven Thymus spp. accessions collected from different regions of Iran along with London agricultural species were studied by karyotypic characteristics. The secondary basic numbers in all ecotypes was x = 15 that probably originate from a primary basic number x = 7. The ploidy levels of these ecotypes were diploid and tetraploid. The Thymus ecotypes under study occupied classes 1A and 1B of Stebbins’ karyotype classification, indicating the presence of a primitive symmetrical karyotype in these ecotypes. The mean chromosome length ranged from 1.03 to 1.53 µm. chromosome types were detected as metacentric “m”. Furthermore, the cluster analysis using chromosomal parameters and based on UPGMA assigned the ecotypes into four groups.
Keywords: Chromosome, Cytogenetic, Genetic diversity, Medicinal plant, Thymus
Full-Text [PDF 1288 kb]   (3819 Downloads)    
Type of Study: Research | Subject: Plant improvement
Accepted: 2014/07/20
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Yousefi V, Najaphy A, Zebarjadi A, Safari H. Investigation of Thymus spp. Karyotypic Diversity in Different Regions of Iran. pgr 2014; 1 (1) :65-76
URL: http://pgr.lu.ac.ir/article-1-29-en.html


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Volume 1, Issue 1 (2014) Back to browse issues page
پژوهش های ژنتیک گیاهی Plant Genetic Researches
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