Examinando por Materia "Domestication"

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Origins of domestication and polyploidy in oca (oxalis tuberosa ; oxalidaceae). 3. aflp data of oca and four wild, tuber-bearing taxa
(Sociedad Botánica de América, 2009-10-01) Emshwiller, Eve; Theim, Terra; Grau, Alfredo; Nina Montiel, Victor Constantino; Terrazas, Franz
Many crops are polyploids, and it can be challenging to untangle the often complicated history of their origins of domestication and origins of polyploidy. To complement other studies of the origins of polyploidy of the octoploid tuber crop oca ( Oxalis tuberosa ) that used DNA sequence data and phylogenetic methods, we here compared AFLP data for oca with four wild, tuber-bearing Oxalis taxa found in different regions of the central Andes. Results confi rmed the divergence of two use-categories of cultivated oca that indigenous farmers use for different purposes, suggesting the possibility that they might have had separate origins of domestication. Despite previous results with nuclear-encoded, chloroplast-expressed glutamine synthetase suggesting that O. picchensis might be a progenitor of oca, AFLP data of this species, as well as different populations of wild, tuber-bearing Oxalis found in Lima Department, Peru, were relatively divergent from O. tuberosa . Results from all analytical methods suggested that the unnamed wild, tuber-bearing Oxalis found in Bolivia and O. chicligastensis in NW Argentina are the best candidates as the genome donors for polyploid O. tuberosa , but the results were somewhat equivocal about which of these two taxa is the more strongly supported as oca ’ s progenitor
Participatory domestication of agroforestry trees: An example from the Peruvian Amazon
(Taylor and Francis Group, 2001-08-01) Sotelo Montes, Carmen; Vidaurre Arévalo, Héctor; Weber, John C.; Simons, Anthony; Dawson, Ian
Valuable tree genetic resources are declining around many farming communities in the Peruvian Amazon, limiting farmers' options for economic development. The International Centre for Research in Agroforestry is working with farming communities to increase productivity and long-term sustainability of their forests, and to empower them to conserve tree genetic resources. This paper describes some principles of participatory tree domestication, and how researchers are working with farmers to select improved planting materials, reduce the risk of poor tree adaptation, produce and deliver high-quality planting material, and scale up participatory tree domestication.