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Nonoptimality of Local Races

For many years it was recommended that selection for vegetative vigor be limited to trees naturally grown near their intended planting sites. The assumption was that local genotypes always survive better and are more vigorous than genotypes evolved more distant from the test site. In recent years, however, evidence of the nonoptimality of local sources in many areas has been mounting. One explanation is that natural selection is for rapid reproduction, while tree breeders are concerned with vegetative vigor. This paper outlines some evidence of nonoptimality of local sources and proposes another explanation.


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Author(s): Gene Namkoong

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1969