Khadijeh Ghomi1, Babak Rabiei2, Hossein Sabouri3, Ebrahim Gholamalipour Alamdari3. 1. Department of Agronomy and Plant Breeding, Faculty of Agricultural Sciences, University of Guilan, Persian Gulf Highway, P.O. Box: 41635-1314, Rasht, Guilan, Iran. 2. Department of Agronomy and Plant Breeding, Faculty of Agricultural Sciences, University of Guilan, Persian Gulf Highway, P.O. Box: 41635-1314, Rasht, Guilan, Iran. rabiei@guilan.ac.ir. 3. Department of Plant Production, Faculty of Agriculture and Natural Resources, Gonbad University, Shahid Fallahi Street, Gonbad-e Kāvūs, Golestan, Iran.
Abstract
BACKGROUND: Barley is one of the major cereal crops, which can provide a significant source of genes for stress tolerance due to its high diversity and adaptability. Metabolite traits are considered to be significant for adaptation of barley to heat stress. METHODS AND RESULTS: In the present study, genetic relationships between 120 barley genotypes were determined with 50 simple sequence repeat (SSR) and 26 inter simple sequence repeat (ISSR) markers under heat stress and non-stress conditions. Moreover, genetic diversity of barley accessions was investigated using the studied markers covering 7 chromosomes of barley. RESULTS: In general, 153 and 85 polymorphic alleles were detected for SSR and ISSR and number of the observed polymorphic allele varied between 2-9 and 2-6, with an average of 3.26 and 3.26 alleles per locus, respectively. Markers of Bmag0223, GBMS180/180, HVM7, ISSR22, ISSR25, and ISSR48 were the most informative due to their high polymorphism information content value demonstrating that putative techniques utilized in this research can be powerful and valuable tools in breeding program of barley. Association analysis was performed between 9 important traits and SSR and ISSR markers using four statistical models. The results revealed that the model containing both population structure (Q) and general similarity in genetic background arising from shared kinship (K) factors reduced false positive associations between markers and phenotypes. CONCLUSIONS: According to the results, some of markers related to more than one trait under normal conditions (ISSR31-2, HVM62, and GBMS180/180) and heat stress conditions (ISSR20-5, EBmac635, HVM14, and ISSR37-3) were determined, which can be considered to be the most interesting candidates for further studies and simultaneously will provide a useful target for the future breeding programs, such as marker-assisted selection (MAS).
BACKGROUND: Barley is one of the major cereal crops, which can provide a significant source of genes for stress tolerance due to its high diversity and adaptability. Metabolite traits are considered to be significant for adaptation of barley to heat stress. METHODS AND RESULTS: In the present study, genetic relationships between 120 barley genotypes were determined with 50 simple sequence repeat (SSR) and 26 inter simple sequence repeat (ISSR) markers under heat stress and non-stress conditions. Moreover, genetic diversity of barley accessions was investigated using the studied markers covering 7 chromosomes of barley. RESULTS: In general, 153 and 85 polymorphic alleles were detected for SSR and ISSR and number of the observed polymorphic allele varied between 2-9 and 2-6, with an average of 3.26 and 3.26 alleles per locus, respectively. Markers of Bmag0223, GBMS180/180, HVM7, ISSR22, ISSR25, and ISSR48 were the most informative due to their high polymorphism information content value demonstrating that putative techniques utilized in this research can be powerful and valuable tools in breeding program of barley. Association analysis was performed between 9 important traits and SSR and ISSR markers using four statistical models. The results revealed that the model containing both population structure (Q) and general similarity in genetic background arising from shared kinship (K) factors reduced false positive associations between markers and phenotypes. CONCLUSIONS: According to the results, some of markers related to more than one trait under normal conditions (ISSR31-2, HVM62, and GBMS180/180) and heat stress conditions (ISSR20-5, EBmac635, HVM14, and ISSR37-3) were determined, which can be considered to be the most interesting candidates for further studies and simultaneously will provide a useful target for the future breeding programs, such as marker-assisted selection (MAS).
Authors: P L Kalliomäki; O Korhonen; T Mattsson; V Sortti; V Vaaranen; K Kalliomäki; M Koponen Journal: Int Arch Occup Environ Health Date: 1979-04-20 Impact factor: 3.015
Authors: E Francia; D Barabaschi; A Tondelli; G Laidò; F Rizza; A M Stanca; M Busconi; C Fogher; E J Stockinger; N Pecchioni Journal: Theor Appl Genet Date: 2007-09-01 Impact factor: 5.699