Home|Journals|Articles by Year

Directory for Medical Articles
 

Regular Article



Study of karyotype and Nucleolar Organizer Regions (NORs)in wild, synthetic and cultivated wheats

M. Arabbeigi, A. Arzani? and G. Saeidi.


Abstract
Cited by (1)

Wild relatives of bread wheat are potential sources of valuable genetic materials for wheatimprovement. Karyotype analysis plays an important role in the identification and designation ofchromosomes in many plant species. In this study, the karyotype features and nucleolar organizer regions(NORs) of 21 wheat genotypes representing diploid, tetraploid and hexaploid species and belonging towild, cultivated and synthetic groups were investigated. Total chromosome length (TCL) values varyacross the genotypes. The highest value (99.1 µm) was recorded in one of a synthetic hexaploid wheat(Doy1/ Ae. squarrosa (458)) with a mean chromosome length (MCL) of 5.67±0.59 µm, while the lowestvalue (39.48µm) was found in T. monococcum species with a mean chromosome length (MCL) of4.06±0.51 µm. Cluster analysis based on chromosomal characteristics and karyotype asymmetry indicesincluding symmetry index (S %), total form percentage (TF %), Romero-Zarco's indices (A1and A2) andStebbin's classification divided the genotypes into three groups. Results revealed that group 1, includingsynthetic hexaploid wheat accessions, had the most asymmetric karyotype in terms of centromere positionand chromosome length. Ag-NOR banding identified two nucleolus organizer regions (NORs) on the longarms of the chromosomes 1B and 6B in both tetraploid and hexaploid wheats.

Key words: Wild relatives, synthetic wheat, chromosome, karyotype, nucleolus organizer regions.






Full-text options


Share this Article



Online Article Submission
• ejmanager.com
• ojshosting.net







Do you want to use OJS for your journal ?
work with an experienced partner
www.OJSHosting.net

eJManager.com
Review(er)s Central
About BiblioMed
License Information
Terms & Conditions
Privacy Policy
Contact Us

The articles in Bibliomed are open access articles licensed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License (https://creativecommons.org/licenses/by-nc-sa/4.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.