DIALLEL ANALYSIS OF DIPLODIA EAR ROT RESISTANCE IN MAIZE

Citation
Ae. Dorrance et al., DIALLEL ANALYSIS OF DIPLODIA EAR ROT RESISTANCE IN MAIZE, Plant disease, 82(6), 1998, pp. 699-703
Citations number
30
Categorie Soggetti
Plant Sciences
Journal title
ISSN journal
01912917
Volume
82
Issue
6
Year of publication
1998
Pages
699 - 703
Database
ISI
SICI code
0191-2917(1998)82:6<699:DAODER>2.0.ZU;2-M
Abstract
A diallel cross of seven inbreds and one synthetic line of maize were analyzed in 1994 and 1995 for their reaction to Diplodia ear rot. An a dditional inbred line was included in the 1995 analysis. Plants were i noculated by placing a pycnidiospore suspension (5 x 10(3) spores per mi) of Stenocarpella maydis in the whorl at the V14 to V15 growth stag e. Crosses were evaluated for disease incidence of Diplodia ear rot at harvest, and the percentage of plants with Diplodia ear rot in a plot was used for analysis. In both years, general combining ability (GCA) effects were significant. In 1995, specific combining ability effects were also significant. There were no reciprocal effects. There was no significant interaction between year and genotypes, indicating that c rosses reacted the same in both years. Inbred lines B37, H111, B68, an d MS had negative GCA effects that contributed toward resistance in bo th years. VA26, with intermediate resistance to Diplodia ear rot, cont ributed toward susceptibility. Only inbred lines with a high degree of resistance should be used as parents.