Have yields of major grains, such as rice, corn, and wheat, started to plateau after decades of growth? (insteading.com)
Gluten - containing foods include most major grains, such as wheat, barley, rye, oats (unless they're certified gluten - free), and beer. (onnit.com)
Genomic studies of the world's major grain crops, together with a technology called marker - assisted breeding, could yield a new green revolution (scientificamerican.com)