A Comparison of Fusiform Rust-Resistant Loblolly Pine Seed Sources
Abstract:A greenhouse inoculation study compared resistance to fusiform rust (Cronartium quercuum (Berk.) Miyabe ex Shirai f. sp. fusiforme) of loblolly pine (Pinus taeda L.) seedlings derived from bulk seed produced in 4 rust-resistant seed orchards, 1 rust-resistant geographic seed source (Livingston Parish, LA), and a control treatment of improved loblolly from a first-generation production orchard. The rust-resistant orchards included 2 forest industry orchards developed from the most rust-resistant clones available within a tree improvement cooperative (1st generation), and both a clonal and a seedling seed orchard from the Georgia Forestry Commission-USDA Forest Service (GFC-USFS) program (2nd generation). The most resistant seedlings (61% rust free) were from the GFC-USFS seedling orchard. The Livingston Parish seedlings and those from the GFC-USFS clonal orchard had significant resistance, both groups being 44% rust free. One forest industry orchard was intermediate in resistance (34% rust free), whereas the second industry orchard was not significantly different from the controls, with 19 and 13% of the seedlings rust free, respectively. The results emphasize the value of increased selection pressure in the future production of highly rust-resistant seedlings with a broad genetic base, and demonstrates the gains that can be achieved in advanced generations. South. J. Appl. For. 10:230-232, Nov. 1986.
Document Type: Journal Article
Affiliations: USDA Forest Service, Southeastern Forest Experiment Station, Athens, GA 30602 and Macon, GA 31208
Publication date: 1986-11-01
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