There are about 30 species of sorghum; S. bicolor is cultivated for grain and forage while S. halepense (Johnson grass) and S. propinquum are cultivated only for forage. Sweet varieties of S. bicolor contain a high concentration of sugar in the stalks and are grown to produce sorghum syrup, forage and silage.
Although it is mostly self-pollinating, protogyny may cause at least 5% natural cross-pollination. The genetic integrity of sorghum accessions is thus maintained by ensuring that flowers self pollinate.
Major sorghum collections
One of the largest collections of sorghum is at the International Crop Research Institute for the Semi-Arid Tropics (ICRISAT) in India. The USDA holds large collections of sorghum at the Southern Regional Plant Introduction Station, University of Georgia, and the National Seed Storage Laboratory, Colorado.
Documents relevant to sorghum
- See references to sorghum on Crop Genebank Knowledge Base