“…In the case of maize breeding, very effective PPB projects are reported all over the world. This is the case of the Andean region (Ecuador, Peru and Bolivia) [21], Brazil [22,23], China [24], Ethiopia [25], Ghana [26], India [27,28], Kenya [29], Mexico and Honduras [30], Nepal [31] and in Nigeria [32]. In Portugal, a very successful long running PPB project in maize (the VASO project, Vale do Sousa -Sousa Valley) is on going since 1984 [33].…”