查看文章

Witchweeds (Striga spp.) are noxious parasitic weeds that cause considerable crop damage in the semiarid tropics. Genetic control of striga is effective, although sources of resistance are limited in most crops. Useful resistance sources have been obtained in sorghum [Sorghum bicolor (L.) Moench], an important host crop that has coevolved with the parasite. Fifty‐five wild accessions within the primary gene pool of sorghum and 20 sorghum cultivars were screened for resistance to Striga asiatica L. Kuntze in the laboratory. Wild sorghums assayed included S. almum Parodi, S. bicolor subsp. drummondii (Steud.) De Wet, race drummondii and race hewisonni, S. bicolor subsp. verticilliflorum (Steud.) Piper with races aethiopicum, arundinaceum, verticilliflorum, and virgatum; S. halepense (L.) Pers.; S. miliaceum; S. rhizomatores; S. sorghastrum; and S. usamberense Wild sorghum accessions varied in their effects on …