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The discovery of transgenic products in maize ( Zea mays ) landraces planted by small-scale Mexican farmers (Quist and Chapela, [2001][1], [2002][2]; [Christou, 2002][3]; [Editorial Note, 2002][4]) raised questions about how the commercial introduction of transgenic maize varieties might affect the

Transgenic Maize and the Evolution of Landrace Diversity in Mexico. The Importance of Farmers' Behavior