Two-stage selection in slash pine produces good gains in fusiform rust resistance
The best 6 of 21 progeny-tested first-generation slash pine selections were crossed in a half diallel to study inheritance patterns of their superior fusiform rust resistance (5 trees) and height (1 tree). Their six first-test progenies were duplicated and included in the study. These two groups of progenies, along with two commercial check lots, were planted on an Upper Coastal Plain and a Flatwoods site in Georgia. At age 10 yr, the 15 progenies in the half diallel averaged 23% rust-infected compared with 54% for the check lots. First-test progenies averaged 30% infected. For percentage infection, the six parents differed in general combining ability (GCA) (0.01>P>0.001) on both test sites and in specific combining ability (0.05>P>0.01) on one site. GCA variation for height was significant (0.05>P>0.01) on one site. The parent selected for height had the highest breeding value for height at age 10 yr. These results show that resistance to the fusiform rust disease, a serious problem in management of the species, can be improved in slash pine. These 6 parents and their 15 progenies in the half-diallel cross are a good source of rust resistance genes for use in slash pine improvement programs.
- Research Organization:
- Forest Service, Asheville, NC (United States). Southeastern Forest Experiment Station
- OSTI ID:
- 422105
- Report Number(s):
- PB-97-123525/XAB; TRN: 70031340
- Resource Relation:
- Other Information: DN: Pub. in Southern Jnl. of Applied Forestry, Vol. 20, No. 3, 143-147(Aug 1996); PBD: Aug 1996
- Country of Publication:
- United States
- Language:
- English
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