Detecting Nucleotide Additivity from Direct Sequences is a SNAP: An Example from <i>Sidalcea</i> (Malvaceae)

Abstract

Abstract: Superimposed nucleotide additivity patterns (SNAPs) were detected from direct sequences of the nuclear ribosomal DNA internal transcribed spacers in a complex of perennial Sidalcea species (Malvaceae) from the Pacific Northwest of the United States. Although only 2.8 % sequence variation exists among the eight ITS accessions, parsimony analysis identified two distinct lineages within this complex consistent with known ploidy levels. Six SNAPs were identified in a known tetraploid S. virgata, suggesting allopolyploid origins from diploid S. virgata and one of two hexaploid Sidalcea species. A dosage effect detected at all six SNAP sites is consistent with the unequal sized parental genomes of allopolyploid S. virgata.