Domesticated Chenopodium of Mexico:  Genetic Variation and  Systematic Relationships
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{'SignBlockName': 'Scott L. Collins', 'PO_EMAI': None, 'PO_PHON': None}
Concerns with human nutrition and with potential large-scale               climatic changes have reinforced arguments for broadened study                  of new crop plants and their wild taxonomic relatives in the                    Americas.  The grain chenopods (family Chenopodiaceae, genus                    Chenopodium), ancient crops of the Inca and Aztec, show great                   promise.  They also provide a living record of American Indian                  agriculture.  However, basic taxonomic information is meager                    regarding geographic distributions, morphological and genetic                   variation among species and among cultivated and weedy forms,                   suspected areas of crop origins, and genealogical relationships                 among the several taxa involved.                                                     Using both molecular and morphometric approaches of                        comparative biology, Drs. Hugh Wilson and James Manhart at Texas                A&M University are investigating species, cultivars, and weed                   races of Chenopodium subsection Cellulata in Mexico and the                     United Sates.  Results will be integrated with their prior                      studies of South American "quinoa," another indigenous crop                     complex.  New analyses of chloroplast DNA mutational differences                will provide data bearing on phylogenetic relationships among                   these plants.  The results will help clarify taxonomic boundaries               between taxa, delimit ranges of variation in domesticated and                   weedy forms, and test ideas about the pre-Columbian origins of                  these crops and their routes of dispersal.
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{'Code': '112700', 'Text': 'Evolutionary Processes'}
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