Wolfgang Zierer, Ravi Bodampalli Anjanappa, Christian Erwin Lamm, Shu-Heng Chang, Wilhelm Gruissem, Uwe Sonnewald There is an urgent need to stimulate agricultural output in many tropical and subtropical countries of the world to combat hunger and malnutrition. The starchy crop cassava (Manihot esculenta), growing even under sub-optimal conditions, is a...