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United States Department of Agriculture

Agricultural Research Service

Title: QUANTITATIVE TRAIT LOCUS ANALYSIS OF SILK MAYSIN CONCENTRATON AND EARWORM RESISTANCE IN MAIZE)

Author
item Byrne, Patrick
item Mcmullen, Michael
item snook, Maurice
item Wiseman, Billy
item Widstrom, Neil
item Lee, Elizabeth
item Coe jr, Edward

Submitted to: Corn and Sorghum Improvement Conference Proceedings
Publication Type: Abstract only
Publication Acceptance Date: 12/4/1997
Publication Date: N/A
Citation:

Interpretive Summary:

Technical Abstract: We used quantitative trait locus (QTL) methodology to identify genetic factors controlling maysin concentration in silks of four maize, Zea mays L., populations. Maysin is a C-glycosyl flavone that inhibits growth of the corn earworm (CEW), Helicoverpa zea (Boddie), which feeds initially on young silks. In the population (GT114 x GT119)F2, over half of the phenotypic variation in maysin concentration was accounted for by the regulatory locus p1. A region on chromosome 9S accounted for 11% of the variation, but its effect was expressed only when the pathway was activated by a functional p1 allele. Population (GE37 x FF8)F3 revealed major effects on maysin concentration and CEW larval growth on chromosomes 2 and 6; candidate loci in these regions include whp1 and sm1. However, a region on chromosome 9S had a large effect on maysin level, but none on larval growth. Separate genetic control of closely related flavonoid compounds was inferred from results for the population (GT114 x NC7A)F2. We detected a large influence on maysin concentration on chromosome 9S, while apimaysin concentration was primarily affected by the pr1 region of chromosome 5. Partial results from the population (GE37 x Mp464)F2 indicated a major effect on maysin in the chromosome 9S region, and smaller effects in the p1 region of chromosome 1 and the c2 region of chromosome 4. One of our most intriguing results is the detection of a significant QTL in the same region of chromosome 9S in all four populations. Our future efforts will include investigations of the nature of the effect of that locus.

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