A United Nations food expert urged the Mexican government to resume a moratorium on genetically-modified varieties of corn. [...] ”In the long term, the continuous improvement of landraces by farmers´ practices of saving, re-sowing and exchanging seeds best suited to specific environments is crucial to effective protection against the unpredictable,” said De Schutter, after visiting with Mexican government officials. He added that poor farmers would become gradually dependent on seeds protected by intellectual property rights and that they would be reliant on a product out of their economic reach.