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Gains from first cycle selection in slash pine pinus elliottii var elliottii and longleaf pine pinus palustris



Gains from first cycle selection in slash pine pinus elliottii var elliottii and longleaf pine pinus palustris



Silvae Genetica 35(4): 155-159



In tree breeding research begun in 1953, three stages of selection--inittial, family, and within-family--were performed in slash (Pinus elliotii Engelm. var. elliottii) and long leaf (P. palustris Mill.) pines. Several traits were used in the selection index was constructed. Results from three studies, two on slash and one on longleaf pines, were assessed at progeny age 21 or 22 years. Initial selection produced moderate gains in height and resistance to fusiform rust caused by Cronartium quercuum f. sp. fusiforme, but some losses in diameter. Selection among families, primarily for rust resistance, produced large gains in that trait but low or negative gains in height, diameter, and volume per tree. Selection within selected families produced gains in volume per tree. Total gains in rust resistance were 144 to 198 percent for slash pine and 65 percent for longleaf pine. For both species, the greatest need revealed in this research was for improved resistance to fusiform rust. Also, selection among families for one critically important trait such as rust resistance needs to be followed by within-family selection for gains in other important traits that were not considered during among-family selection.

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