Conservación in situ de las fuentes genéticas del arroz

Population diversity and ecosystem services

“…Agrostis tenuis) have evolved genetic characteristics that enable them to colonize mine tailings and other sites with soil mineral concentrations that are lethal to other populations of the same species [37], giving them value as soil stabilizers. Perhaps the most important ecosystem service in which study of genetic differentiation of populations is crucial is in maintaining or augmenting crop yields, which depends on genetic material that often is only available from populations of wild relatives of crops [38,39].…”

Social science research and conservation management in the interior Borneo: unravelling past and present interactions of people and forests

“…Some researchers have suggested making farmers agents in local germplasm conservation (Vaughan and Chang 1992). In fact, that farmers have such great interest in looking at, experimenting with, and adopting new rice varieties might work against conserving 'local, rare, and indigenous' varieties.…”

“…National and international institutions-like the International Rice Research Institute (IRRI) in the Philippines, the Centre for Research and Development of Coarse Grains, Pulses, Roots and Tuber Crops (ESCAP CGPRT Centre) in Bogor, and botanical gardens in many countries-have established seed gene banks to conserve and develop rice germplasm. In situ conservation, however, is still needed for seed production, since complex in situ environments cannot be replicated in screenhouses, and maintaining ex situ genetic populations is costly, as Vaughan and Chang (1992) noted. In situ environments are subject to dynamic changes-occurrence of new pests and diseases, natural crosspollination between cultivated and wild varieties-causing new stresses that might produce a new strain as a prolongation of natural evolution whereas 'ex situ conservation essentially freezes germplasm at one point' (Vaughan and Chang 1992: 372).…”

“…To better understand farmers' roles in in situ conservation of agro-ecosystems, we need descriptions of intracommunity dynamics (see Vaughan and Chang 1992), i.e., individual farmers' agricultural practices and interactions with one another with regard to these practices. Research, then, should focus not only on what biodiversity and what knowledge of it are present, but also on how that diversity, and knowledge of it, is generated and maintained Vayda 1992, citing Vayda 1992).…”

Population structural analysis of an <i>in-situ</i> conservation site for wild rice in Laos

“…In order to facilitate such studies, wild rice needs to be conserved and maintained in its natural condition. One idea proposed for the maintenance of wild populations is in-situ conservation (Vaughan and Chang, 1992;Xie et al, 2001). Successful management and conservation of wild rice in in-situ conservation areas requires a comprehensive knowledge of population genetic structure.…”