The composition and abundance of repetitive sequences are divergent between the genomes of C. lacryma-jobi and C. aquatica HG. The results from fine karyotyping analysis and chromosome pairing suggested diploidization of C. lacryma-jobi during evolution and C. aquatica HG is a recently formed hybrid. The genome-wide comparison of repetitive sequences indicated that the repeats in Coix were more similar to those in Sorghum than to those in Zea, which is consistent with the phylogenetic relationship reported by previous work.
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