|Coe Jr, Edward|
Submitted to: Maize Genetics Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 3/13/1997
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: We used quantitative trait locus (QTL) analysis to study genetic control of concentrations of the insect-resistance factors maysin and apimaysin in maize silks. Maysin is a C-glycosyl flavone with hydroxyl groups at the 3' and 4' positions in the B-ring, while apimaysin is identical except for a single hydroxyl group, at the 4' position. Analysis of variance of an F2 population derived from the cross of GT114 (low apimaysin) x NC7A (high apimaysin) indicated a major effect (R**2 = 36.7%) on apimaysin concentration from chromosome 5 near the pr1 locus, but only a minor effect of that region (R**2 = 3.2%) on maysin level. Conversely, the wx1 region of chromosome 9S had a large effect (R**2 = 21.8%) on maysin level, but no significant effect on apimaysin concentration. These results indicate apparent independent genetic control of these related compounds, suggesting that mono- and di-hydroxy intermediates are channeled separately through the pathway. In four different populations, the same region of 9S, between bz1 and wx1, has exhibited a major effect on maysin concentration with similar gene action (dominant for low maysin). We propose the designation rem1, recessive enhancer of maysin1, for the 9S locus controlling maysin levels in these populations.