Sorghum (Sorghum bicolor [L.] Moench) (Fig. 1) originated in north-eastern Africa and was domesticated there around 5000-8000 years ago. The largest diversity of cultivated and wild sorghum is also found in this part of the continent. An important secondary centre of origin of sorghum is the Indian subcontinent, with evidence for early cultivation dating back about 4500 years. There is still a high level of untapped biodiversity, with 17 of the world’s 25 recognised species of sorghum being native to Australia (Dillon et al., 2004).