Genetic Variation and Breeding of Scots Pine in the Netherlands
Abstract:Wind-pollinated seeds were collected from over 500 phenotypically superior trees growing in about 110 planted stands in Holland and nearby countries. Progenies were planted in as many as six localities in Holland and examined at from 2 to 8 years of age from seed. Strong genetic effects were found for total height and resistance to Lophodermium needle cast--families accounted for 64 and 58 percent of the variation in plot means (16 trees per plot) for these two traits, respectively. Height growth and needle cast damage were strongly correlated. Progenies from stands within Holland, especially from the northwestern part of the pine forests, grew the fastest and had the least needle cast damage. Progenies of parents planted after 1900 usually performed better than those of parents planted earlier. Both the geographic and planting date patterns were probably caused by natural and artificial selection in past generations. Genotype X planting site interaction was not significant in one pair of plantings permitting a test of this factor. No appreciable parent-progeny correlation could be shown, and under these conditions, progeny testing of many selections would be required to make appreciable genetic gains. Estimated gains are 11 percent from collection of seed from the best stands, chosen on the basis of progeny tests; 14 percent from conversion of a progeny test to a seedling seed orchard; and 28 percent from establishment of clonal orchards using parents chosen on the basis of progeny tests. Forest Sci. 21:341-352.
Document Type: Journal Article
Affiliations: Officer in Charge of the Statistical and Conifer Breeding Sections of Dorschkamp Research Institute for Forestry and Landscape Planning, Wageningen, Netherlands
Publication date: December 1, 1975
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