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U.S. Department of Agriculture USDA Forest Service Southern Regional Extension Forestry Southern Regional Extension Forestry

Expression Patterns of Pinus Defense Genes During Host-Pathogen Interactions

Genetic resistance to fusiform rust exists and controlled inoculation studies have revealed the evolution of specific (gene-for-gene) resistance in pine-Cronartium interactions. In slash pine, families can not only be classified as susceptible or resistant to fusiform rust based on gall presence/absence, but also on gall morphology. Small galls on young slash pines often ‘disappear’ as the tree matures, a phenomenon that has been referred to as partial resistance. To identify candidate genes for conditioning fusiform rust gall morphology and possibly partial resistance, we probed our pine defense-associated array with cDNA derived from RNA isolated from either large or small galls on slash pine. The arrays were statistically analyzed as six pairwise contrasts to distinguish between host tissue and pathogen regulation. A total of 158 genes were identified as significantly regulated in one or more of the contrasts.

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Author(s): Alison M. Morse, Katherine E. Smith, Dudley A. Huber, Sarah F. Covert, Kimberly D. Hunt

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 2005