Abstract
Estimates of the phylogenetic relationships among cultivated and wildAllium species would benefit from identification of molecular characters. Restriction enzyme analysis of the chloroplast DNA (cpDNA) of the bulb onion (Allium cepa), Japanese bunching onion (A. fistulosum), wildAllium species in sect.Cepa andPhyllodolon, and the outgroupsA. ampeloprasum andA. tuberosum detected 39 polymorphisms.Allium cepa andA. vavilovii were identical for all characters. Cladistic analysis generated three most-parsimoniousWagner trees of 44 steps differing only in a zero-length branch.Allium fistulosum andA. altaicum (sect.Phyllodolon) comprised a monophyletic lineage separated from theA. cepa andA. vavilovii of sect.Cepa. The unresolved node was composed ofA. galanthum, A. roylei, and the lineage containingA. cepa, A. vavilovii, A. fistulosum, andA. altaicum. The clade containingA. altaicum, A. cepa, A. fistulosum, A. galanthum, A. roylei, andA. vavilovii remained resolved for strict consensus ofWagner trees of 48 steps or less.Allium pskemense andA. oschaninii were increasingly distant.Allium oschaninii has been proposed as the progenitor of the bulb onion, but was more closely related to the common progenitor of all species in sect.Cepa andPhyllodolon. Phylogenies estimated from cpDNA characters usingDollo parsimony resulted in a single most-parsimonious tree of 46 steps and agreed with phylogenies based onWagner parsimony. Polymorphic restriction enzyme sites in the 45s ribosomal DNA were not used to estimate phylogenies because of uncertain homologies, but are useful for identifying interspecific hybrids. The maternal phylogenies estimated in this study help to distinguish wildAllium species closely related to the bulb onion. Although not in agreement with classifications based on morphology, the phylogenies closely reflected crossability among species in sect.Cepa andPhyllodolon.
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Havey, M.J. Restriction enzyme analysis of the chloroplast and nuclear 45s ribosomal DNA ofAllium sectionsCepa andPhyllodolon (Alliaceae). Pl Syst Evol 183, 17–31 (1992). https://doi.org/10.1007/BF00937732
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DOI: https://doi.org/10.1007/BF00937732