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

Fusiform Rust Resistance of Progeny From Natural Loblolly x Shortleaf Pine Hybrids

Seedlings of thirty-nine open-pollinated shortleaf, loblolly and putative loblolly x shortleaf pine families were inoculated with fusiform rust and scored for stem gall formation after six and nine months. Arcs in of square root percent rust infection of progeny was regressed against five morphological traits and hybrid index scores of the parents. Hybrid index appeared to be the best predictor of progeny response to fusiform rust, shortleaf pines with low and loblolly pines with high rust susceptibility. Some parent trees with intermediate hybrid index scores appeared to be hybrids and produced progeny with intermediate responses to rust inoculation. Most putative hybrids resembled shortleaf pine morphologically and in their response to rust. Results prompted speculation that introgression of loblolly and shortleaf pine occurs in East Texas but frequency of individuals which could be definitely classed as hybrids is low.


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Author(s): L. Zack Florence, Ray R. Hicks, Jr.

Publication: Tree Improvement and Genetics - Northeastern Forest Tree Improvement Conference - 1975