Inheritance of resistance in some wheat introductions to selected races of bunt, Tilletia caries (DC) Tul and Tilletia foetida (Wallr) Liro Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/sq87bx965

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  • Bunt or stinking smut is a major disease of wheat. In the U.S. common bunt, Tilletia caries (DC) Tul. and T. foetida (Wallr) Liro, is a threat to wheat production in the Pacific Northwest. Screening trials conducted by USDA Cereal Investigations Project in Oregon, from 1955-1980, revealed that a number of wheat introductions were resistant to all known races of common bunt. In this study the inheritance of resistance in seven wheat introductions to selected races of common bunt was investigated. Objectives of the investigation were to determine (a) the number of genetic factors controlling resistance; (b) whether the same factor(s) condition resistance to all races used as inoculum for each cross; (c) whether resistance in these introductions is governed by known or new genetic factors. Resistant introductions PI 166910, PI 166921, PI 173438, PI 178192, PI 178201, CI 9342 and selection M72-365 of PI 178383/Elgin were crossed to the susceptible cultivar Elgin. Inheritance studies were conducted on the F₃ progenies and the advanced generations of these crosses following inoculation with selected races of common bunt. Some preliminary studies were also made on F₂ progenies of the crosses of CI 9342, PI 166910 and PI 166921 with Elgin. Chi-square test was performed to test hypothesis for number of genes governing resistance and correlations were used to measure degree of association of factors controlling resistance. On the basis of data presented the following conclusions were drawn: 1. Bunt resistance in CI 9342 and selection M72-365 of PI 17838/Elgin was controlled by a single gene which was identified to be Bt8. 2. In PI 178192 two genes, a major and a minor gene, controlled bunt resistance. The major gene was identified to be Bt8 but the minor gene has yet to be identified. 3. Three major genes plus two minor genes governed bunt resistance in PI 173438. Two of the major genes were Bt7 and Bt8. The third major gene and the minor genes have yet to be identified. 4. Bunt resistance in PI 178201 was controlled by three major genes. Genes Bt3 and Bt9 plus a previously unknown gene were involved. 5. Bunt resistance in PI 166921 was controlled by two major genes which were identifies to be Bt7 and and Bt9. 6. Three major genes governed bunt resistance in PI 166910. Genes Bt7 and Bt9 in addition to a previously unknown gene, designated Bt11., were involved.
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