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Allozyme genetic markers were used to evaluate the effectiveness of supplemental mass-pollination for the production of pitch X loblolly pine hybrids. On the basis of the frequency of a loblolly pine (Pinus taeda L.) marker in the pollen pools (gametes effective in fertilization) of six mass-pollinated clones of pitch pine (Pinus rigida Mill.), the average proportion of hybrid seed set was estimated as 0.11; however, that estimate varied considerably among clones (0.01-0.32). Proportions of hybrids in 1-year-old nursery-grown progeny, as estimated by morphological features, also varied widely among clones, but averaged 0.20. The discrepancy between the allozyme and nursery estimates and the low frequency of hybrids are discussed, emphasizing the potential usefulness of allozyme markers in future studies of supplemental mass-pollination. Forest Sci. 29:423-432.
Assistant Professor, School of Forestry, Oregon State University, Corvallis, OR 97331
Publication date: June 1, 1983
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Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.