Genetic Basis of Fusiform Rust Disease Resistance in Loblolly Pine

Research using RAPD marker/disease phenotype associations to marker tag, map and thereby identify rust resistance genes in loblolly pine is in progress. In a study involving progeny from seven pine mother trees (families) inoculated with basidiospores from six single aeciospore rust isolates (SAIs), four different heterozygous resistance genes have been identified (one each) in four different mother trees. Apart from a single dominant resistance allele at a given locus in each of these four mother trees, other loci (in these four trees) with resistance potential, detectable with our isolates, appear homozygous recessive (lacking resistance). Five to 15 polymorphic RAPD markers now exist for the various resistance genes. A mother tree with dual resistance, two of the previously noted heterozygous resistance genes, has also been recognized in the study. Pine-rust interactions among the isolates and the five studied families clearly fit a gene for gene (complementary genetic system) model with four corresponding gene pairs.

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Author(s): Henry V. Amerson, A. P. Jordan, E. George Kuhlman, David M. O'Malley, Ronald R. Sederoff

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

Section: Poster Abstracts

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