Resistance to Grain Mold and Downy Mildew in a Mini-Core Collection of Sorghum Germplasm

摘要: Grain mold and downy mildew are important biotic constraints to grain sorghum (Sorghum bicolor) production worldwide best managed through host plant resistance. A mini-core collection composed of 242 germplasm accessions developed from a core 2,246 landrace 58 countries was evaluated identify sources Of the accessions, 140 that flowered during rainy season (the other 102 were photoperiod sensitive) screened for resistance in nursery under field epiphytotic conditions 2007 2008. All greenhouse using sandwich inoculation technique. Fifty resistant (≤10% mean severity). These represented four basic six intermediate races originated 21 exhibited considerable diversity agronomic morphological traits. Downy (mean incidence ≤10%) observed only (IS 28747, IS 31714, 23992, 27697, 28449, 30400) accessions. One accession, both diseases. The morphologically agronomically diverse or should be useful disease breeding programs.