Genetic Diversity and Relationships in Local Varieties of Eggplant from Different Cultivar Groups as Assessed by Genomic SSR Markers

• Main Authors: Santiago VILANOVA, Maria HURTADO, Adriana CARDONA, Mariola PLAZAS, Francisco J. HERRAIZ, Pietro GRAMAZIO, Isabel ANDÚJAR, Jaime PROHENS
• Format: Article
• Language: English
• Published: AcademicPres 2014-06-01
• Series: Notulae Botanicae Horti Agrobotanici Cluj-Napoca
• Online Access: http://www.notulaebotanicae.ro/index.php/nbha/article/view/9414

Spain is a secondary center of diversity for eggplant (<i>Solanum melongena</i>). Spanish landraces of eggplant are normally classified in four cultivar groups: Round, Listada de Gandía, Semi-Long, and Long. We have used 19 genomic SSRs for the molecular characterization of 30 eggplant accessions corresponding to the four cultivar groups. Sixteen SSRs of which 15 were polymorphic could be amplified and 65 polymorphic alleles, with a range of two to 11 alleles/locus, were detected. The polymorphism information content (<i>PIC</i>) of SSR markers ranged from 0.07 to 0.77, with an average value of <i>PIC</i>=0.50. The mean observed heterozygosity (<i>H_o</i>) presented a very low value <i>H_o</i>=0.01, while the mean expected heterozygosity (<i>H_e</i>) had a value of <i>H_e</i>=0.57. Multivariate cluster analyses revealed that a considerable diversity exists within each of the cultivar groups. Listada de Gandía and Long cultivar groups were clearly separated from each other in different branches of phenogram. The principal coordinates analysis (PCoA) confirmed that each of the cultivar groups is genetically diverse and, with the exception of the Round group, they plot in different areas of the PCoA graph. Overall, the results indicate that Spanish eggplant landraces present a high degree of homozygosis, considerable intra-cultivar group diversity, and a certain degree of genetic differentiation. This information is of interest for selection and breeding of eggplant as well as for germplasm conservation.