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Title:Inheritance of resistance to anthracnose stalk rot of corn
Author(s):Toman, Joseph, Jr
Doctoral Committee Chair(s):White, Donald G.
Department / Program:Crop Sciences
Discipline:Plant Pathology
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Agriculture, Agronomy
Agriculture, Plant Pathology
Abstract:Inheritance of resistance to anthracnose stalk rot (ASR) of corn (Zea mays L.), caused by Colletotrichum graminicola was studied in eight crosses involving two resistant inbred lines DW1035 ((MP305 x FRB73$\sp{\lbrack 5\rbrack }$)$\sb{\rm S8}$) and DW890 ((MP305 x FRB73$\sp{\lbrack 5\rbrack }$)$\sb{\rm S8}$), and four susceptible inbred lines FRB73, B84, FRMo17, and C103. In 1987, the crosses consisted of the parental lines, F$\sb1$, F$\sb2$, and both backcross generations. In 1988 and 1989 the study included F$\sb3$ and backcross selfed lines. Individual observed stalk rot reactions within a particular generation were classified as resistant or susceptible by discriminant analysis. Expected stalk rot distributions were determined using a partitioning method for a single, dominant gene hypothesis. The observed distributions were compared for goodness-of-fit to the expected distributions using a chi-square test for homogeneity. Support exists with the FRB73 x DW1035 and B84 x DW890 crosses for a single, dominant gene for ASR resistance, but environmental stresses in 1988 and 1989 significantly hindered the ability to obtain conclusive evidence, especially in the B84 x DW1035 population. The data also suggest differences between the resistant inbred lines DW1035 and DW890. Use of FRMo17 and C103 as susceptible parents to interpret the inheritance of a stalk rot with DW1035 and DW890 were complicated by the inability to distinguish the resistant and susceptible parents as two distinct classes.
Issue Date:1991
Type:Text
Language:English
URI:http://hdl.handle.net/2142/19173
Rights Information:Copyright 1991 Toman, Joseph, Jr
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9136751
OCLC Identifier:(UMI)AAI9136751


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