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Proliferation rate of stem cells derived from human dental pulp and identification of differentially expressed genes
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Idah Madamombe-Manduna Heike Vibrans Lauro López-Mata 《Biodiversity and Conservation》2009,18(6):1589-1610
Theory and empirical data suggest the areas of origin of a crop to be the general area of origin of its coevolved weeds. These
longer evolved weeds would have an advantage over species with a shorter evolutionary time and migrate more successfully.
We seek to identify patterns by comparing two regions with a shared crop, similar physiographic traits, but little direct
contact, one of which is the area of origin of the crop. We compared the diversity of the maize weed flora and its edible
components between two rural villages each of Oaxaca, Mexico, and Honde Valley, Zimbabwe, using vegetation sampling, interviews
and participatory observation. The Mexican fields had higher species richness and diversity than the Zimbabwean ones. Species
richness and densities were higher in the villages that receive more rainfall. Mexican fields had a mainly native weed flora
with almost 80% American species and very few of African origin, whereas Zimbabwe had 32% of American and 50% of African origin.
The regions shared seven American species and one of African origin. American/Mesoamerican agrestal weeds appear to be more
successful in maize. Subsistence farmers in both study areas consumed about 19 edible weed species of which four were common
to all villages. Our results also suggest that the presence of 3–4 species of edible weeds per field may be a general pattern
in the maize-based systems, and that people not necessarily want or need more, so usefulness—at least as an edible plant—would
have a limited influence on migration success. 相似文献
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Economic Botany - This study evaluates the relevance of wild-growing vegetables in two villages of the Honde Valley, Zimbabwe, by documenting the use, knowledge of, and attitudes toward these... 相似文献
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