Complete plastid genome sequences suggest strong selection for retention of photosynthetic genes in the parasitic plant genus Cuscuta.

After calculating corrected distances of nonsynonymous nucleotide substitution per nonsynonymous site ( d N ) and synonymous substitution per synonymous site ( d S ) for all genes in Ipomoea and Nicotiana relative to a common outgroup, Panax , an interesting trend toward relaxed selection in the genome of the fully autotrophic Ipomoea was revealed (fig. 4 ).

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