|Guill, Katherine - Kate|
Submitted to: Maize Genetics Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 3/14/2001
Publication Date: 3/14/2001
Citation: GERKE, J., SNOOK, M.E., HOUCHINS, K.E., BUSHMAN, B.S., MCMULLEN, M.D. THE GENETICS OF CHLOROGENIC ACID AND FLAVONE SYNTHESIS IN THE MAIZE INBRED MO6. MAIZE GENETICS CONFERENCE. 2001. ABSTRACT. P. 109. Interpretive Summary:
Technical Abstract: Chlorogenic acid, a phenylpropanoid compound, and the flavones maysin and isoorientin have been shown to contribute to corn earworm (Helicopvera zea Boddie) resistance when produced in the silks of maize (Zea mays L.). We examined the F2 offspring from a cross of two inbred lines (Mo6 x A619) to identify loci affecting accumulation of these chemicals. These inbred lines were chosen due to their clear differences in compound accumulation of these chemicals. Mo6 accumulates an unusually high level of clorogenic acid, with negligible amounts produced in A619. We constructed a linkage map using 93 simple sequence repeat markers spanning all 10 chromosomes to associate differences in phenotype with genetic loci. Using composite interval mapping as implemented in QTLCARTOGRAPHER, several significant loci were identified. Our results indicate loci associated with the production of all three compounds on chromosome 1 near marker locus bnlg182 2and on chromosome 2 near bnlg1138. On chromosome 5, loci for both maysin and chlorogenic acid are located near marker loci bnlg1346 and mmc0282, respectively. Additional loci for chlorogenic acid are located on chromosome 3 (bnlg1113), chromosome 4 (bnlg1755 and umc1173) and chromosome 8 (umc1309). Analysis of the roles and interactions of these loci and the identification of candidate genes will provide a clearer definition of flavone and chlorogenic acid synthesis.