Resistance to Aspergillus ear rot and aflatoxin

In 1991, 1,041 and 949 crosses with the susceptible corn (Zea mays L.) inbreds Mo17 and B73, respectively, were evaluated for resistance to ear rot caused by Aspergillus flavus using a pinboard inoculator developed at the University of Illinois. Inbreds used in development of F$\sb1$ hybrids included agricultural experiment station releases, and inbreds from Canada, Europe, Mexico, India, China, and South Africa. The F$\sb1$ crosses were evaluated with a susceptible inbred to identify sources of resistance with alleles not found in B73 or Mo17 for incorporation into widely grown hybrids. From the F$\sb1$ crosses, 18 inbreds crossed with B73 and 17 inbreds crossed with Mo17 were selected (35 total F$\sb1$'s) and analyzed for aflatoxin content. In 1992, inheritance of resistance to A. flavus ear rot was studied in the 35 crosses involving the parental, F$\sb1$, F$\sb2$, and backcross to the susceptible parent generations. The F$\sb3$ generations were also evaluated for ten of the crosses. In 1993, 11 of the crosses were revaluated using the parental, F$\sb1$, F$\sb2$, F$\sb3$, and backcross to the susceptible and to the resistant generations. Five F$\sb2$ and three F$\sb3$ populations selected from the 35 F$\sb1$ crosses were evaluated for A. flavus ear rot and for aflatoxin in 1992 and 1993, respectively. Aflatoxin values from individual F$\sb2$ plants and F$\sb3$ families were separated into classes to study frequency distributions. In separate experiments, the 32 inbreds per se and 35 F$\sb1$ crosses were reevaluated for A. flavus ear rot, kernel infection, and aflatoxin in 1992 and 1993. Also, 20 selected F$\sb1$ crosses were evaluated in Starkville, Mississippi during 1993 for A. flavus ear rot and aflatoxin content.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Crop Sciences

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Campbell, Keith William

Contributors dc:contributor

• White, Donald G.

• Agriculture, Agronomy
• Agriculture, Plant Pathology

Statement dc:rights

• Copyright 1995 Campbell, Keith William

Language dc:language

eng

Identifier

AAI9522085
(UMI)AAI9522085

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/21118