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    Author(s): Bohun B. Kinloch Jr.; Roy W. Stonecypher
    Date: 1969
    Source: Phytopathology, Vol. 59(9): p. 1246-1255
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (1.8 MB)

    Description

    Striking genetic variation in susceptibility to fusiform rust was observed among SS controlled-pollinated (CP) and 48 wind-pollinated (WP) families from parent trees of loblolly pine selected at random in a natural forest stand in southwest Georgia. The mating design permitted statistical tests for estimating both additive and total genetic variance. WP families were planted on two different sites, CP families on four sites, including one where a deliberate attempt was made to increase the hazard of fusiform-rust infection. Susceptibility to rust was measured as the percentage of trees infected and the average number of galls per tree. Variation among both CP and WP families was great on all sites, with family means ranging from 0.5-10.8 galls/tree (17.5-100% of trees infected) on the site with the most severely infected trees. Heritability estimates were high (0.65-0.8S) and remarkably uniform on all sites tested. There was a consistent positive relationship between parent and offspring over all sites; on the average, WP progenies from rust-free parents had less rust than those from rust-infected parents, and CP progenies from two rust-free parents had less rust than those with one rust-free parent, which in turn had less than those from two rust-infected parents. Since some notable exceptions to this trend were observed, however, it was concluded that greater gains in resistance to fusiform rust can be obtained by combining phenotypic selection with progeny testing than by the former alone. Variation in the amount of rust among sites was also great, ranging from a mean of 0.5-3.4 galls/tree (31.6-79.5% of trees infected). The relative rankings of families on the different sites was fairly stable, and the genotype X site interaction was small. Edaphic factors associated with the previous cultural history of the sites apparently influenced the amount of rust that subsequently developed on the trees. Knowledge of this relationship could be used to advantage in progeny testing.

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    Citation

    Kinloch Jr., Bohun B.; Stonecypher, Roy W. 1969. Genetic variation in susceptibility to fusiform rust in seedlings from a wild population of loblolly pine. Phytopathology, Vol. 59(9): p. 1246-1255

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