Plant & Animal Genome V Conference
Town & Country Hotel, San Diego, CA, January 12-16, 1997.
PAG-V: P204 - INHERITANCE OF INSECTICIDE PHYTOTOXICITY IN SORGHUM
P204
INHERITANCE OF INSECTICIDE PHYTOTOXICITY IN SORGHUM
TOURE, ABOUBACAR(1), Wenwei Xu(2), Darrell T. Rosenow(3), Gary C. Peterson(3), Henry T. Nguyen(3)
1. IER, CRRA-Sotuba BP 438 Bamako, Mali, West Africa
2. Texas Tech University, Dept. of Plant and Soil Science, Lubbock, TX 79409
3. Texas A&M Univ., Texas Agricultural Experiment Station, Route 3 Box 219, Lubbock, TX 79401
Sorghum and Maize RFLP probes were used to construct linkage map group in sorghum ( Sorghum bicolor (L.) Moench ) using a recombinant inbred lines (RILs) derived from the cross of B35 * Tx 7000. We have mapped quantitative trait loci (QTLs) associated with insecticide phytotoxicity (burn) in F7 recombinant inbred lines of this population. The RILs were evaluated in West Texas in 1993-1995. Data showed one major locus of insecticide phytotoxicity (Rcb) located at the end of the linkage group G at 11.4 cM from the marker TXS713. This result shows that insecticide phytotoxicity is determined by a single gene. The inheritance of resistance to insecticide phytotoxicity in sorghum was determined using crosses of susceptible by resistant genotypes. Parental lines, F1 hybrids and F2 populations were sprayed with Lorsban R in field trials and evaluated for resistance by rating individual plants. F2 population distribution led to the conclusion that resistance to insecticide phytotoxicity (burn) was qualitatively inherited. All F1 hydrid plants had severe leaf burn. The F2 populations segregated in a ratio of 1 resistant: 3 susceptible. Results show that resistance to insecticide phytotoxicity is controlled by single recessive gene.