جستجوی مقالات مرتبط با کلیدواژه "نشانگرهای مولکولی هدفمند" در نشریات گروه "کشاورزی"

Objective :

The main goals of this study were investigation of genetic diversity in 103 Aegilops accessions and comparison of the efficiency of start codon targeted (SCoT) and CAAT box-derived polymorphism (CBDP) markers.         

 Materials and methods:

 In this study, the genetic diversity in 103 Aegilops accessions belonging to seven species including seven samples of Ae. caudata, 14 samples of Ae. crassa, 19 samples of Ae. cylindrica, 11 samples of Ae. neglecta, 20 samples of Ae. tauschii, 15 samples of Ae. triuncialis and 17 samples of Ae. umbellulata was evaluated using 15 SCoT and 15 CBDP primers. 

 Results:

 In total, 15 SCoT and 15 CBDP primers amplified 164 and 141 polymorphic bands, respectively. SCoT primers showed the highest values for all of the informativeness parameters than CBDP primers. However, both molecular markers indicated the same PIC values. The results of analysis of molecular variance (AMOVA) revealed that the highest proportion of genetic variance referred to within species. Among all species, Ae. cylindrica had the highest values of genetic parameters. Although cluster analysis based on each marker system classified all accessions into two main groups, the grouping pattern obtained from CBDP data indicated a clear phylogenetic relationship among Aegilops species compared to SCoT data. Besides, the results of clustering were confirmed by principal coordinates analysis (PCoA) analysis.  

Conclusion: 

On the whole, both molecular markers revealed good capability in depicting of polymorphism among tested accessions. However, CBDP markers provided a vivid grouping pattern for evaluated samples. Hence, the use of this technique individually or in combination with other molecular markers is recommended for phylogenetic assessments.

The main objectives of this study were to evaluate the genetic diversity in 53 Aegilops accessions belonging to Aegilops tauschii, Ae. cylindrica and Ae. crassa as well as comparison of the efficiency of start codon targeted (SCoT) and targeted region amplification polymorphism (TRAP) markers. A total of 15 SCoT and six TRAP primer pairs amplified 165 and 201 polymorphic bands, respectively. TRAP primers indicated higher values for the number of polymorphic bands, marker index and resolving power compared to SCoT primers. However, SCoT primers showed the higher PIC value than TRAPs. The results of molecular variance analysis (AMOVA) were different for each of the marker systems, so that SCoT markers showed the highest portion of genetic variance referred to intra-species, while based on TRAP markers the highest variance was observed inter-species. SCoT markers indicated the highest values for all genetic parameters compared to TRAPs and Ae. cylindrica and Ae. tauschii exhibited the highest genetic variation based on SCoTs and TRAPs, respectively. Cluster analysis based on each marker systems as well as the pooled data classified all accessions into three main groups. The clustering pattern based on SCoT primers was clearer than TRAPs. Hence, the use of SCoT markers is recommended for population genetic structure analysis and grouping of them, while the use of TRAPs can be recommended for fine mapping studies.