Physic nut germplasm genetic diversity identified by internal simple sequence repeats (ISSR) markers
Resumo
The physic nut has attracted great interest for their socioeconomic promising vegetable oil production capacity that can be used in biodiesel manufacturing. However, the species is still under a domestication process and many studies are still needed to start a breeding program. In this context, this study aimed to evaluate the genetic diversity in 29 physic nut accessions from two germplasm banks using 14 ISSR markers. Genetic characterization revealed that 86.64% of the genetic variation is present within the groups, whereas 13.36% corresponded to the variation between the groups. The total mean number of alleles per locus was 1.99 and the effective number of alleles corresponded to 1.42. The Bayesian analysis allocated the access into four clusters, showing that the clusters formed showed no relation to the origin of access. The Jaccard similarity index indicated that the extent of similarity between accessions ranged from 0.23 to 0.94. The dendrogram formed the same four access groups as those formed by the Bayesian analysis, and all groups were in agreement in both analyses. The study demonstrated the need and importance of a germplasm collection from several regions and countries in order to preserve the genetic diversity of the species and the development of Euphorbiaceae breeding programsDownloads
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