title: Comparison of RAPD, ISSR, and AFLP Molecular Markers to Reveal and Classify Orchardgrass (Dactylis glomerata L.) Germplasm Variations.
abstract: Three different DNA-based techniques, Random Amplified Polymorphic DNA (RAPD), Inter Simple Sequence Repeat (ISSR) and Amplified Fragment Length Polymorphism (AFLP) markers, were used for fingerprinting Dactylis glomerata genotypes and for detecting genetic variation between the three different subspecies. In this study, RAPD assays produced 97 bands, of which 40 were polymorphic (41.2%). The ISSR primers amplified 91 bands, and 54 showed polymorphism (59.3%). Finally, the AFLP showed 100 bands, of which 92 were polymorphic (92%). The fragments were scored as present (1) or absent (0), and those readings were entered in a computer file as a binary matrix (one for each marker). Three cluster analyses were performed to express--in the form of dendrograms--the relationships among the genotypes and the genetic variability detected. All DNA-based techniques used were able to amplify all of the genotypes. There were highly significant correlation coefficients between cophenetic matrices based on the genetic distance for the RAPD, ISSR, AFLP, and combined RAPD-ISSR-AFLP data (0.68, 0.78, 0.70, and 0.70, respectively). Two hypotheses were formulated to explain these results; both of them are in agreement with the results obtained using these three types of molecular markers. We conclude that when we study genotypes close related, the analysis of variability could require more than one DNA-based technique; in fact, the genetic variation present in different sources could interfere or combine with the more or less polymorphic ability, as our results showed for RAPD, ISSR and AFLP markers. Our results indicate that AFLP seemed to be the best-suited molecular assay for fingerprinting and assessing genetic relationship among genotypes of Dactylis glomerata.
authors.affiliation: Unidade Estratégica de Investigação e Serviços de Biotecnologia e Recursos genéticos, INIAV-Pólo de Elvas, Estrada Gil Vaz, 6. 7351-901, Elvas, Portugal.
authors.forename: Rita
authors.initials: R
authors.lastname: Costa
authors.affiliation: Unidade Estratégica de Investigação e Serviços de Biotecnologia e Recursos genéticos, INIAV-Pólo de Elvas, Estrada Gil Vaz, 6. 7351-901, Elvas, Portugal.
authors.forename: Graça
authors.initials: G
authors.lastname: Pereira
authors.affiliation: Área de Fisiología Vegetal, Facultad de Ciencias, Universidad de Extremadura, Avda. de Elvas s/n. E-06006, Badajoz, Spain.
authors.forename: Inmaculada
authors.initials: I
authors.lastname: Garrido
authors.affiliation: Unidade Estratégica de Investigação e Serviços de Biotecnologia e Recursos genéticos, INIAV-Pólo de Elvas, Estrada Gil Vaz, 6. 7351-901, Elvas, Portugal.
authors.forename: Manuel María
authors.initials: MM
authors.lastname: Tavares-de-Sousa
authors.affiliation: Área de Fisiología Vegetal, Facultad de Ciencias, Universidad de Extremadura, Avda. de Elvas s/n. E-06006, Badajoz, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: Espinosa
mesh_terms: D054458:Amplified Fragment Length Polymorphism Analysis; D016000:Cluster Analysis; D016172:DNA Fingerprinting; D018744:DNA, Plant / Q000235:genetics; D031745:Dactylis / Q000145:classification* / Q000235:genetics*; D005819:Genetic Markers; D014644:Genetic Variation; D018895:Microsatellite Repeats; D011110:Polymorphism, Genetic; D011174:Portugal; D019105:Random Amplified Polymorphic DNA Technique
chemical_list: D018744:DNA, Plant; D005819:Genetic Markers