@article{mckeand_li_grissom_isik_jayawickrama_2008, title={Genetic parameter estimates for growth traits from diallel tests of loblolly pine throughout the southeastern United States}, volume={57}, ISSN={["2509-8934"]}, DOI={10.1515/sg-2008-0016}, abstractNote={Abstract Variation in heritability and in genetic correlation estimates were evaluated for juvenile tree height and volume for six testing areas of loblolly pine (Pinus taeda L.) in the southeastern United States. Variance components and their functions (heritability and type B genetic correlations) were estimated from 265 six-parent disconnected diallel series, tested in almost 1000 trials (4 tests per diallel series). Original data were collected at age 6 years from about one million trees (265 diallel series x 30 crosses x 36 trees per cross/site x 4 sites) planted in field tests. Genetic tests were from the second cycle of breeding in the North Carolina State University - Industry Cooperative Tree Improvement Program. The overall unbiased individual-tree narrow-sense heritability for height was 0.19 and for volume was 0.16. The broad-sense heritabilities for height (0.24) and for volume (0.22) were higher than narrow-sense heritabilities due to the presence of non-additive genetic variance. There were moderate regional differences in these estimates, with tests in the Lower Gulf Coastal Plain tending to have the highest heritabilities for growth traits. There was very little association between site index and heritability, but heritabilities were higher on sites with the highest survival and highest test precision. Genotype x environment interactions were generally low both for half-sib and full-sib families, indicating that families can be operationally deployed to different sites with little concern about unpredictable performance.}, number={3}, journal={SILVAE GENETICA}, author={McKeand, S. E. and Li, B. and Grissom, J. E. and Isik, F. and Jayawickrama, K. J. S.}, year={2008}, pages={101–110} }
 @inproceedings{jayawickrama_mckeand_jett_1995, title={Phenological variation in height and diameter growth in provenances and families of loblolly pine}, booktitle={Proceedings of the 23rd Southern Forest Tree Improvement Conference}, author={Jayawickrama, K. J. S. and McKeand, S. E. and Jett, J. B.}, year={1995}, pages={33–39} }
 @article{jayawickrama_balocchi l._1993, title={Tree improvement in Chile: Two decades of progress}, volume={91}, number={6}, journal={Journal of Forestry}, author={Jayawickrama, K. J. S. and Balocchi L., C.}, year={1993}, pages={43} }
 @article{jayawickrama_mckeand_jett_young_1992, title={ROOTSTOCK AND SCION EFFECTS ON CARBOHYDRATES AND MINERAL NUTRIENTS IN LOBLOLLY-PINE}, volume={22}, ISSN={["1208-6037"]}, DOI={10.1139/x92-256}, abstractNote={Variation in scion physiology caused by rootstock families, scion clones, and the rootstock–scion interactions were studied in loblolly pine (Pinustaeda L.). Ten full-sib families were used as rootstocks, and six scion clones were grafted on the rootstocks in all combinations. The trees were measured during and after the 2nd year after grafting; the traits measured were needle carbohydrate (starch, sucrose, and hexoses) concentrations and needle N, P, K, Ca, and Mg concentrations. These traits were measured in early fall and early spring. There were highly significant differences among scion clones for all traits. Rootstocks significantly affected hexoses in fall, total sugars in spring, P, K, Ca, and Mg in fall, and Ca and Mg in spring. For most traits the largest variance component was within each rootstock-scion combination; next largest were those for scion clones. Variance components for rootstocks were small or negative for most traits, indicating that the scion has more control than the rootstock o...}, number={12}, journal={CANADIAN JOURNAL OF FOREST RESEARCH}, author={JAYAWICKRAMA, KJS and MCKEAND, SE and JETT, JB and YOUNG, E}, year={1992}, month={Dec}, pages={1966–1973} }