Sorghum (Sorghum bicolor (L.) Moench) is a plant belonging to the family of grasses (Poaceae). Sorghum, a C4 grass that diverged from maize around 15 million years ago, is the fifth most important cereal grown worldwide (Dogget,1988). Sorghum is well adapted to tropical and subtropical climates, but the greater part of the area of the crop falls in drought-prone, semi-arid tropical regions of the world.