Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Registration of Tift MR88 midge resistant sorghum germplasm.

Abstract

Tift MR88, resistant to Contarinia sorghicola, was developed from a BC1 population of Redbine 60 × PI383856, the latter parent being the source of resistance. In trials at 3 Georgia sites during 1984-87, its damage rating (on a 0 = no damage to 9 = 90-100% damage scale) ranged from 0.5 to 2.0, vs. 3.2 to 8.5 for susceptible control BTx623; damage percentages in the 2 genotypes at College Station, Texas, were 8 and 94%, respectively. Tift MR88 reaches 2.1 m in height, flowers 2-3 days later than BTx623 × Tift MR88 hybrids and restores male fertility to A1Tx623 × Tift MR88 hybrids. Crosses of Tift MR88 with susceptible lines are midge-susceptible, indicating that its resistance is under recessive genetic control.