| impact of past climatic and recent anthropogenic factors on wild yam genetic diversity. | forests of the dahomey gap are considered as refugia for many species. they play a crucial role in providing ecosystem services in an area devoid of forests. however, the impact of the way they are managed on the biodiversity they host has barely been investigated. wild yams existing in these forests play a crucial role in maintaining the genetic diversity of cultivated yams. indeed, studies of farmer practices have shown that, by way of ennoblement, wild yams collected and selected in the fores ... | 2011 | 21366748 |
| molecular marker based taxonomy and phylogeny of guinea yam (dioscorea rotundata - d. cayenensis). | four different molecular techniques were used to assess relationships among 21 accessions of guinea yam (dioscorea rotundata and dioscorea cayenensis) and 21 accessions belonging to seven putative progenitor species. random amplified polymorphic dna (rapd) and microsatellite-primed pcr (mp-pcr) analysis yielded 246 informative characters that were transformed into a matrix of pairwise distances and analyzed by neighbor joining or split decomposition. both methods gave congruent results. well-sep ... | 1997 | 18464876 |
| permanent genetic resources added to molecular ecology resources database 1 june 2010 - 31 july 2010. | this article documents the addition of 205 microsatellite marker loci to the molecular ecology resources database. loci were developed for the following species: bagassa guianensis, bulweria bulwerii, camelus bactrianus, chaenogobius annularis, creontiades dilutus, diachasmimorpha tryoni, dioscorea alata, euhrychiopsis lecontei, gmelina arborea, haliotis discus hannai, hirtella physophora, melanaphis sacchari, munida isos, thaumastocoris peregrinus and tuberolachnus salignus. these loci were cro ... | 2010 | 21565125 |
| variation in the effectiveness of biotic defence: the case of an opportunistic ant-plant protection mutualism. | benefits to plants in facultative ant protection mutualisms are highly variable. this allows examination of the sources of this variation and the mechanisms by which ants protect plants. we studied opportunistic interactions between ants and an extrafloral nectary-bearing vine, dioscorea praehensilis, during 3 different years. variation in plant protection among years was striking. several factors affected the effectiveness of the biotic defence. stems recently emerged from the underground tuber ... | 2001 | 28547192 |
| facing herbivory on the climb up: lost opportunities as the main cost of herbivory in the wild yam dioscorea praehensilis. | plants with simple architecture and strong constraints on their growth may offer critical insights into how growth strategies affect the tolerance of plants to herbivory. although dioscorea praehensilis, a wild yam of african forests, is perennial, both aerial apparatus and tuber are annually renewed. each year, the tuber produces a single stem that climbs from the ground to the forest canopy. this stem bears no leaves and no branches until it reaches optimal light conditions. once in the canopy ... | 2017 | 28861251 |