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Title: Heritability and intertrait correlations in breeding subpopulations of jack pine
Author: Riemenschneider, Don E.
Source: In: Guries, R.P., ed. Proceedings of the Fourth North Central Tree Improvement Conference. Madison, WI: University of Wisconsin-Madison: 12-22
Description: Twenty breeding populations of jack pine were established in 1979 and 1980 in Minnesota, Wisconsin, and Michigan. Four populations were index populations and were each established at 4 locations by research cooperators. Sixteen populations were applied breeding populations and were established at single locations by public and private cooperators. Combined analysis of height at age 5 in index populations at three locations indicated little genotype x environment interaction and heritability of 0.19. Separate analysis of index populations indicated that the amount of genotype x environment interaction varied in relation to main effect family variance but was never more than 50 percent of the family variance. Heritability estimates for height at age 3 in 13 surviving breeding populations varied from 0 to 0.57. Population related differences in heritability may have been due to sampling variation, environmental differences, or both. The data suggested a need for remeasurement of the 13 surviving breeding populations which are currently 6 years old. Heritability in most populations is sufficient to recommend that selection and breeding to produce the second generation be initiated now. Selection of parents at age 5 or 6 has previously been shown to be effective in many species of Pinaceae.
Keywords: Population site, genotype x environment interaction, crown form, branch size, branch angle
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Riemenschneider, Don E. 1985. Heritability and intertrait correlations in breeding subpopulations of jack pine. In: Guries, R.P., ed. Proceedings of the Fourth North Central Tree Improvement Conference. Madison, WI: University of Wisconsin-Madison: 12-22
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