Format

Send to

Choose Destination
Phytopathology. 2006 Mar;96(3):221-5. doi: 10.1094/PHYTO-96-0221.

Analysis of quantitative trait Loci for resistance to southern leaf blight in juvenile maize.

Abstract

A set of 192 maize recombinant inbred lines (RILs), derived from a cross between the inbred lines Mo17 and B73, were evaluated as 3-week-old seedlings in the greenhouse for resistance to southern leaf blight, caused by Cochliobolus heterostrophus race O. Six significant (LOD >3.1) quantitative trait loci (QTL) were identified for disease resistance, located on chromosomes 1, 2, 3, 6, 7, and 8. Results were compared with a previous study that had used the same RIL population and pathogen isolate, but had examined resistance in mature rather than juvenile plants. There was a very weak but significant correlation between the overall resistance phenotypes of the RILs scored as mature and juvenile plants. Two QTL were found in similar positions on chromosomes 1 and 3 at both growth stages. Other QTL were specific to one growth stage or the other. Twenty-three of these RILs, together with the parental lines, were inoculated in the greenhouse with four C. heterostrophus isolates. Results indicated that the quantitative resistance observed was largely isolate non-specific.

PMID:
18944435
DOI:
10.1094/PHYTO-96-0221
Free full text

Supplemental Content

Full text links

Icon for Atypon
Loading ...
Support Center