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while artificial selection allows us to find "local optima" in crop yields and quality, quality of crops will taper off after a while unless we can introduce new sorts of variation. sometimes, wild populations related to certain crop foods have desirable traits, like cold resistance. the teosinte (corn relative) species zea diploperennis, which is both perennial and resistant to several viruses no other corn relative is immune to, was found only in 900 acres of a reserve in mexico and can now be used for interbreeding with corn stocks. if a reserve hadn't been made around it, it
while artificial selection allows us to find "local optima" in crop yields and quality, quality of crops will taper off after a while unless we can introduce new sorts of variation. sometimes, wild populations related to certain crop foods have desirable traits, like cold resistance. the teosinte (corn relative) species zea diploperennis, which is both perennial and resistant to several viruses no other corn relative is immune to, was found only in 900 acres of a reserve in mexico and can now be used for interbreeding with corn stocks. if a reserve hadn't been made around it, it would probably be extinct by now