Soleri, D., D.A. Cleveland and F. Aragón Cuevas (2006) Transgenic crops and crop varietal diversity: the case of maize in Mexico. BioScience 56(6):503-513.
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Transgenic crop varieties are a rapidly expanding and controversial technology. Their effects on biological and cultural diversity are a key issue in an
often polarized debate. Here we provide answers to questions about one important example, that of transgenic maize in Mexico. In situ maize
diversity in Mexico is present in traditional varieties in farmers’ fields, and in wild and weedy relatives of maize. It is likely that transgenes are
present in farmers’ local maize varieties, but it is unknown whether they have introgressed. Socioeconomic changes, including migration, trade
liberalization, and reduced support for Mexican farmers, may also affect maize diversity. Diversity may increase, decrease, or remain the same, but
whether this is viewed as good or bad will depend on subjective values.