Genotype-Environment Interaction in North Central United States
Genetic and site effects have generally been stronger than genotype-site interaction in 8- to 12-year-old provenance and progeny tests of 11 species conducted in north central United States. However, in four species there were strong north-south interactions which were probably related to differences in winter temperature and hardiness. Many lesser interactions could be proved statistically in most experiments but might be artifacts and are of little practical significance because they cannot be interpreted. Purely statistical data on non-interpretable interactions are of little practical value but are the main reason for practicing replication within each of several test plantations. Ideal experiments may be those in which each seedlot is replicated at many different places but in which there is a minimum of replication within each plantation. Because of the scarcity of interpretable interactions, it is difficult to explain many of the genetic differences in terms of adaptation to modem climatic and site conditions. Forest Sci. 19:113-123.
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Document Type: Journal Article
Affiliations: Professor of Forestry, Michigan State University, East Lansing, Mich. 48823
Publication date: 1973-06-01
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