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Sandoval-Padilla, Isaac; Zamora-Tavares, María del Pilar; Ruiz-Sánchez, Eduardo; Pérez-Alquicira, Jessica; Vargas-Ponce, Ofelia
PhytoKeys, 10/2022, Volume: 210Journal Article
In this study, we sequenced, assembled, and annotated the plastome of Physalis cordata Mill. and compared it with seven species of the genus Physalis sensu stricto. Sequencing, annotating, and comparing plastomes allow us to understand the evolutionary mechanisms associated with physiological functions, select possible molecular markers, and identify the types of selection that have acted in different regions of the genome. The plastome of P. cordata is 157,000 bp long and presents the typical quadripartite structure with a large single-copy ( LSC ) region of 87,267 bp and a small single-copy ( SSC ) region of 18,501 bp , which are separated by two inverted repeat ( IRs ) regions of 25,616 bp each. These values are similar to those found in the other species, except for P. angulata L. and P. pruinosa L., which presented an expansion of the LSC region and a contraction of the IR regions. The plastome in all Physalis species studied shows variation in the boundary of the regions with three distinct types, the percentage of the sequence identity between coding and non-coding regions, and the number of repetitive regions and microsatellites. Four genes and 10 intergenic regions show promise as molecular markers and eight genes were under positive selection. The maximum likelihood analysis showed that the plastome is a good source of information for phylogenetic inference in the genus, given the high support values and absence of polytomies. In the Physalis plastomes analyzed here, the differences found, the positive selection of genes, and the phylogenetic relationships do not show trends that correspond to the biological or ecological characteristics of the species studied.
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