Graduate Thesis Or Dissertation
 

Inheritance of Septoria leaf blotch resistance and the possible influence of heading date and plant height on the disease expression in a winter wheat cross

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  • Parental lines, Fi's and segregating populations (F₂, F₃ and BC's) including reciprocals were evaluated under field conditions to determine if genetic resistance per se exists for Septoria Leaf Blotch in a selected winter wheat cross. The experiment was conducted over a three year period with both natural infection and artificial inoculations being employed. Data were collected on an individual plant basis. The mode of inheritance was determined using the generation mean analysis. Phenotypic correlations and path coefficient analyses were employed to determine if possible associations of plant height and heading date were influencing disease severity. Differences for all variables were observed for the parents and all generations each year. Based on the frequency distribution of the F₂ population, all variables measured appeared to be quantitatively inherited. Information from the generation mean analyses showed that both additive and nonadditive genetic effects were involved in the expression of disease resistance. Dominance and epistasis effects were more important in influencing disease resistance. That genetic resistance per se was involved was evidenced by the consistent difference observed within and between generations. As observed from the phenotypic correlations and path coefficient analysis, a significant amount of variation in disease expression could not be accounted for by variation in plant height and heading date. In addition, F₃ lines with similar maturity and plant height differed in their level of disease resistance. It does appear however, that a compromise will be necessary in both plant height and heading date if acceptable levels of resistance are to be achieved, as no progeny was found to be as early and short as the susceptible parent with acceptable levels of disease resistance.
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