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Complete Chloroplast Genomes of Erianthus arundinaceus and Miscanthus sinensis: Comparative Genomics and Evolution of the Saccharum Complex.
PloS One 2017
The genera Erianthus and Miscanthus, both members of the Saccharum complex, are of interest as potential resources for sugarcane improvement and as bioenergy crops. Recent studies have mainly focused on the conservation and use of wild accessions of these genera as breeding materials. However, the sequence data are limited, which hampers the studies of phylogenetic relationships, population structure, and evolution of these grasses. Here, we determined the complete chloroplast genome sequences of Erianthus arundinaceus and Miscanthus sinensis by using 454 GS FLX pyrosequencing and Sanger sequencing. Alignment of the E. arundinaceus and M. sinensis chloroplast genome sequences with the known sequence of Saccharum officinarum demonstrated a high degree of conservation in gene content and order. Using the data sets of 76 chloroplast protein-coding genes, we performed phylogenetic analysis in 40 taxa including E. arundinaceus and M. sinensis. Our results show that S. officinarum is more closely related to M. sinensis than to E. arundinaceus. We estimated that E. arundinaceus diverged from the subtribe Sorghinae before the divergence of Sorghum bicolor and the common ancestor of S. officinarum and M. sinensis. This is the first report of the phylogenetic and evolutionary relationships inferred from maternally inherited variation in the Saccharum complex. Our study provides an important framework for understanding the phylogenetic relatedness of the economically important genera Erianthus, Miscanthus, and Saccharum.
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