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Home → Publications → Tree Improvement and Genetics → Southern Forest Tree Improvement Conference → 21st Southern Forest Tree Improvement Conference (1991) → Early Field Performance of Rust-Resistant Clones of Slash Pine: A Combination of Direct and Indirect Selection

Early Field Performance of Rust-Resistant Clones of Slash Pine: A Combination of Direct and Indirect Selection

Two-month old slash pine (Pinus elliottii Engelm. var. elliottii) seedlings from four known rust-resistant, full-sib families and three known rust-resistant, open-pollinated families were subjected to a standardized fusiform rust inoculation test. Based on rust infection readings taken 4 months post-inoculation, all the families showed greater resistance than the susceptible checklot (( 6 SL). Five of the seven families showed greater resistance than the resistant checklot ( FA2), based on their Index of Relative Resistance. In a field study conducted near Bogalusa, Louisiana, all seedlings without galls were cloned by rooted cuttings and outplanted, along with two seedling checklots. After two growing seasons, survival averaged 95% for the rooted cuttings and 98% for the seedlings. Rust infection was 1% for the rooted cuttings compared with 43% and 29% for the resistant and susceptible seedling checklots, respectively. The rooted cuttings were smaller than the seedlings after one growing season (0.83 and 1.07 ft, respectively), but this difference can probably be attributed to differences in initial planting size. During the second growing season, both propagule types grew a similar amount in height (1.51 ft for rooted cuttings and 1.56 ft for seedlings).


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Author(s): J. L. Ford-Logan, G. Sam Foster, J. P. van Buijtenen

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1991

Section: General Session: Genetic Testing and Selection