Premium
Analysis of Nuclear Genetic Resistance in Maize to Race T of Southern Corn Leaf Blight
Author(s) -
Johnson G. R.
Publication year - 1976
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1976.0011183x001600030006x
Subject(s) - biology , selfing , hybrid , inbreeding , inbred strain , blight , plant disease resistance , genetic analysis , agronomy , genetic variation , selection (genetic algorithm) , genetics , gene , artificial intelligence , computer science , population , demography , sociology
Two maize ( Zea mays L.) inbred lines, in Texas malesterile cytoplasm (Tcms), with high levels of nuclear genetic resistance to race T southern corn leaf blight ( Helminthosporium maydis Nisikado and Miyake) were derived by selfing and selection from two open‐pollinatedcomposite sources. The lines were confirmed to be in Tcms and were utilized in crosses with an extremely susceptible Tcms line in two generation‐mean analysis experiments. Resistance was polygenic, and additive genetic effects accounted for most of the variation among generations. Dominance effects accounted for a small but significant portion of the genetic variance in both experiments. The results suggest that gene frequencies for resistance could be enhanced by recurrent mass selection. In a program for development of commercial hybrids, selection should be practiced in male‐sterile cytoplasm in two unrelated source populations. Lines would be extracted by inbreeding and crossed. Resulting hybrids would be evaluated for disease resistance, agronomic suitability, and yield.