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Home → Publications → Tree Improvement and Genetics → Southern Forest Tree Improvement Conference → 24th Southern Forest Tree Improvement Conference (1997) → Derivation of Host and Pathogen Genotypes in the Fusiform Rust Pathosystem on Slash Pine Using a Complimentary Genetics Model and Diallel Data

Derivation of Host and Pathogen Genotypes in the Fusiform Rust Pathosystem on Slash Pine Using a Complimentary Genetics Model and Diallel Data

The homozygous dominant reaction gene of parent 8-7 at locus 1, complemented by the homozygous dominant avirulence gene in culture WLP-10, is thought to be the reason that families with 8-7 as one of the parents appear to be so "resistant" when challenged with WLP-10. Two additional complementary gene pairs can be hypothesized if the May data is included for families 9-2 x 18-26 and 18-27 x 18-26. The identification of these gene pairs using both the May and July inoculation data suggest the existence of temperature-sensitive genes in this pathosystem. A Chi-square analysis of the July inoculation data using a complementary model with four gene pairs indicate a good fit between expected and observed percentage infection levels. The implications of these findings on rust screening and deployment are discussed.


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Author(s): Henry E. Stelzer, R. L. Doudrick, Thomas L. Kubisiak, C. Dana Nelson

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1997

Section: Contributed Presentations: Full Papers