Indirect selection and clonal propagation of loblolly pine seedlings enhance resistance to fusiform rust

Foster, G.S.; Anderson, R.L.

Canadian Journal of Forest Research 19(4): 534-537


ISSN/ISBN: 0045-5067
DOI: 10.1139/x89-085
Accession: 001860923

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A population of loblolly pine (Pinus taeda L.) seedlings without fusiform rust (Cronartium quercuum (Berk.) Miyabe ex Shirai f. sp. fusiforme) galls was developed by controlled-cross matings of parent trees with known rust resistance, and subsequent screening of the seedling offspring through artificial inoculation. The seedlings without rust galls then entered a vegetative propagation system using rooted cuttings. Second round of rust testing by artificial inoculation, using a random sample of 20 clones from the program, revealed a high degree of rust resistance (4% galled) compared with that of seedlings from either a resistant control seedlot (50% galled) or a susceptible control seedlot (81% galled). This apparently high degree of rust resistance may be due to genetic effects, rooted cutting morphology, or both.