Background Although banana (sp. 4095 in Cavendish Grande Naine. A subset of 95 potential defense-related gene-derived simple sequence repeat (SSR) loci were validated for specific amplification and polymorphism across accessions. Fourteen loci were polymorphic, with alleles per polymorphic locus ranging from 3 to 8 and polymorphism information content ranging from 0.34 to 0.82. Conclusions A large set of unigenes were characterized in this study for both Calcutta 4 and Cavendish Grande Naine, increasing the TAN1 number of public domain ESTs. This transcriptome is an invaluable resource for furthering our understanding of biological processes elicited during biotic stresses in Colla (A genome) and Colla (B genome), which are both members of the section germplasm from itscentre of origin in Southeast Asia and the Pacific region has resulted in a spread of pests and disease, causing major constraints to banana production. Biotic stresses include fungi, bacteria, viruses, nematodes and insects. In excess of 40 fungal pathogens cause disease in banana [2], with three species of the genus recognized as important foliar pathogens. As causal members of the Sigatoka disease complex, is responsible for black leaf streak disease, for Sigatoka leaf spot disease, and for Eumusae leaf spot. was the first pathogen to be recorded on banana, distributing from Java (Indonesia) in 1902 to most of the worlds production areas in the 1960s [3]. Having a preference for higher altitudes and cooler temps, it is typically a greater problem during rainy months in subtropical banana growing areas [4,5]. Foliar necrotic lesions and diminished photosynthetic capacity cause reductions in fruit quantity and size per bunch, with premature fruit ripening observed in the field and post-harvest. Estimated production losses vary between 50 and 100%, given that infected fruits have no commercial value [6,7]. As disease resistance is absent in most cultivated varieties, in particular users of the Cavendish subgroup, control is largely based upon agronomic management methods and software of protectant and systemic fungicides. In addition to increasing production costs, long term dependence upon agrochemical Pexmetinib control raises selection pressure for fungicide resistance or tolerance development in pathogen populations. Resistance to benzimidazole, triazole and strobilurin systemic fungicides has been reported in the genus genotypes, commercial triploid and diploid cultivars are seedless and parthenocarpic, with fruit development via parthenocarpy. With maintenance of such vegetation by vegetative propagation [10], somatic mutation-driven development has resulted in a crop having a thin genetic base, with many genotypes lacking resistance to pests and disease. Standard genetic improvement is definitely Pexmetinib hindered principally by male and female sterility, with methods time-consuming and demanding in terms of land use. For example, current hybridization strategies for the development of resistant tetraploid varieties rely upon sexually active crazy or improved fertile diploids, which provide sources of resistance to biotic and abiotic tensions, for crossing with founded semi-fertile triploid genotypes [11,12]. Success can be limited, however, given low figures or absence of seeds. Complementary strategies for resolving constraints for improvement will also be under development, with molecular and tissue-culture methods including mutagenesis, somaclonal variance, somatic hybridization and genetic modification via flower transformation (for review observe [13]). Genetic changes of requires access to genomic info, including expression analysis of gene models under different conditions. Nuclear genome size has been reported to range from Pexmetinib 534C615 Mbp in the genus, with variance observed between varieties and among genotypes [14]. The publication in July 2012 of a 90% total draft of.