Nineteen microsatellite markers were used to fingerprint a set of 19 potato landraces from the island of La Palma (Canary Islands). These landraces represent relicts of early introductions from South America, although most are commonly cultivated by local farmers. The SSR primers detected 62 polymorphisms, 13 of which were present in all landraces. Several accession- and group-specific markers were detected. Jaccard similarity coefficients were estimated from the molecular data and UPGMA cluster analysis was performed. Some cultivars with related common names clustered together.
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Showing items 1 through 9 of 54.-
Library ResourceDocuments de politique et mémoiresjuin, 2007Espagne, Amériques, Amérique du Sud
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Library ResourceDocuments de politique et mémoiresdécembre, 2008Canada
Agricultural land protection near the urban-rural fringe is a goal of manyjurisdictions, including British Columbia, Canada, which uses a provincial-widezoning scheme to prevent subdivisions and non-agricultural uses of the land.Preferential taxes are also used to encourage agricultural use of the land. Small scalehobby farmers are present at the urban fringe near Victoria (the capital), both insideand outside of the Agricultural Land Reserve (ALR).
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Library ResourceDocuments de politique et mémoiresdécembre, 2011Lettonie, États-Unis d'Amérique
For the last 15 years, the agglomeration of Riga has expanded and one of the most important problems that Riga faces is movement of middle-class people to surrounding municipalities. This tendency is mostly referable to the processes in the USA during the second half of the 20th century. This research has first identified the history and causes of urban sprawl since the earliest times and has compared it with the situation in Riga Region.
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Library ResourceDocuments de politique et mémoiresdécembre, 2009Brésil
This paper analyzes the effect of uncertainty in several key parameters on the marginal costs of carbon sequestration in forests. These parameters include the land supply elasticity, which governs the conversion of land from agriculture to forests and vice versa; parameters of the forest biomass yield function; parameters of the forest carbon density function; and parameters of the costs functions for accessing inaccessible land.
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Library ResourceDocuments de politique et mémoiresdécembre, 2004Costa Rica
We summarize existing theoretical claims linking poverty to rates of deforestation and then examine this linkage empirically for Costa Rica during the 20th century using an econometric approach that addresses the irreversibilities in deforestation. Our data facilitate an empirical analysis of the implications for deforestation of where the poor live. Without controlling for this, impacts of poverty per se are confounded by richer areas being different from the areas inhabited by the poor, who we expect to find on more marginal lands, for instance less profitable lands.
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Library ResourceDocuments de politique et mémoiresdécembre, 2004Costa Rica
We review claims about the potential for carbon markets that link both payments for carbon services and poverty levels to ongoing rates of tropical deforestation. We then examine these effects empirically for Costa Rica during the 20th century using an econometric approach that addresses the irreversibilities in deforestation. We find significant effects of the relative returns to forest on deforestation rates. Thus, carbon payments would induce conservation and also carbon sequestration, and if land users were poor could conserve forest while addressing rural poverty.
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Library ResourceDocuments de politique et mémoiresseptembre, 2007Bolivie
From 2001 to 2003, field collections of wild potatoes (Solanum Section Petota Solanaceae) were made in the north of the Department of La Paz, Bolivia, with the aim of determining their current distribution in this region. The collection embraced sectors of five provinces: Omasuyos, Larecaja, Camacho, Muñecas and Bautista Saavedra. Five previously described wild species were collected: Solanum acaule Bitter, S. achacachense Cárdenas, S. brevicaule (Bitter) Juz and Buk, S. candolleanum Berthault and S. circaeifolium Bitter, as well as four unidentified species.
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Library ResourceDocuments de politique et mémoiresdécembre, 2006Argentine
Frequently, agriculture intensification by means of high-input technologies and agroecosystem simplification led to unsustainable farming systems. Increasing spatial-temporal diversity in agroecosystems has been shown as a promising alternative for restoring degraded land. A methodological approach is discussed here, based on preliminary results of experiences in a region of strong biophysical gradients. The CENTURY model is validated under local conditions and used as monitoring tool.
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Library ResourceDocuments de politique et mémoiresmars, 2009Inde, Brésil, Chine, États-Unis d'Amérique
We quantify the emergence of biofuel markets and its impact on U.S. and world agriculture for the coming decade using the multi-market, multi-commodity international FAPRI (Food and Agricultural Policy Research Institute) model. The model incorporates the trade-offs between biofuel, feed, and food production and consumption and international feedback effects of the emergence through world commodity prices and trade.
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Library ResourceDocuments de politique et mémoiresdécembre, 2010Slovénie, Pérou, Europe
The tree species composition of silver fir and beech forests has changed in space and time due to a number of direct and indirect natural and anthropogenic causal factors. Forming silvicultural guidelines, therefore, requires a sufficient understanding of the ecological, historical, economic and general environmental factors that influence silver fir-beech forests.
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