title: Assessment of genetic variation in Bulgarian tomato (Solanum lycopersicumL.) genotypes, using fluorescent SSR genotyping platform.
abstract: Genetic variability in modern crops is limited due to domestication and selection processes. Genetic variation in eight Bulgarian tomato varieties and breeding lines (variety Plovdivska karotina, variety IZK Alya, L21β, L53β, L1140, L1116, L975, L984) differing in their morphological and biochemical composition was assessed using a highly efficient and low-cost fluorescent simple sequence repeat (SSR) genotyping platform. Genotyping was conducted with 165 publicly available microsatellite markers developed from different research groups under a number of projects in tomato (SOL Genomics SSRs, Kazusa TGS and TES, SLM, TMS and LEMDDNa) among which only five (3.03%) failed to amplify the expected PCR fragments. Of the remaining markers, 81 (50.62%) were polymorphic in the whole collection of eight genotypes. Among the marker groups used, SLM markers were most polymorphic, followed by TMS and SOL Genomics SSR markers. The total number of amplified alleles was 299, with a mean of 1.869; and the average polymorphic information content (PIC) was 0.196. The genetic diversity within the collection was relatively low (0.2222). Nei's genetic distance varied from 0.0953 to 0.3992. Cluster analysis using the un-weighted pair group method with arithmetic mean (UPGMA) method indicated that the studied tomato genotypes are grouped in four main clusters, which is to some extent consistent with the morpho- and hemo-types of the studied tomatoes. Variety IZK Alya (cherry type) and two of the breeding lines (L1140, L1116) formed three separate and more distant clusters. The fourth cluster includes the other five genotypes. The observed grouping of these genotypes in two sub-clusters reflects their similar morphological and biochemical composition. The genetic distance information from this study might be useful for further implementation of breeding strategies and crosses among these inbred lines.
authors.affiliation: Agricultural Academy, AgroBioInstitute , Sofia , Bulgaria.
authors.forename: Elena
authors.initials: E
authors.lastname: Todorovska
authors.affiliation: Agricultural Academy, AgroBioInstitute , Sofia , Bulgaria.
authors.forename: Albena
authors.initials: A
authors.lastname: Ivanova
authors.affiliation: Agricultural Academy, Maritsa Vegetable Crops Research Institute , Plovdiv , Bulgaria.
authors.forename: Daniela
authors.initials: D
authors.lastname: Ganeva
authors.affiliation: Agricultural Academy, Maritsa Vegetable Crops Research Institute , Plovdiv , Bulgaria.
authors.forename: Galina
authors.initials: G
authors.lastname: Pevicharova
authors.affiliation: Faculty of Ecology and Landscape Architecture, University of Forestry, Sofia , Bulgaria.
authors.forename: Emil
authors.initials: E
authors.lastname: Molle
authors.affiliation: Faculty of Agronomy, Agricultural University, Plovdiv , Bulgaria.
authors.forename: Bojin
authors.initials: B
authors.lastname: Bojinov
authors.affiliation: Agricultural Academy, AgroBioInstitute , Sofia , Bulgaria.
authors.forename: Mariana
authors.initials: M
authors.lastname: Radkova
authors.affiliation: Bulgarian Academy of Sciences, Institute of Plant Physiology and Genetics , Sofia , Bulgaria.
authors.forename: Zhivko
authors.initials: Z
authors.lastname: Danailov
keywords: SSR; genetic distance; genetic diversity; phylogenetic relationships; tomato (Solanum lycopersicum L.)