@article{saborio_dvorak_donahue_thorpe_1997, title={In vitro regeneration of plantlets from mature embryos of pinus ayacahuite}, volume={17}, DOI={10.1093/treephys/17.12.787}, abstractNote={A plantlet regeneration protocol was developed for Pinus ayacahuite var. ayacahuite (Ehrenb.). Embryos from mature seeds from ten provenances were cultured in a 16-h photoperiod for 3 days on a medium containing 30 mM sucrose and 0.7% agar. Cotyledons from these embryos were subcultured onto MCM medium (Bornman 1983) supplemented with 50 micro M N(6)-benzyladenine and 90 mM sucrose for 2 weeks. Bud development and shoot elongation were maximized by subculturing the explants on half strength AE medium (von Arnold and Ericksson 1981), supplemented with 60 mM sucrose and 0.05% activated charcoal every 30 days. Seed source had a significant effect on the responses of the embryos to the bud induction protocol. For the provenance with the best response to bud induction, about 79% of the cultured cotyledons formed buds, and each cotyledon formed a mean of 9.1 buds, so that about 70 shoots could be induced from each seed. The best rooting response (40% rooting) was obtained by treating the shoots for 8 h with 100 micro M naphthalene acetic acid.}, number={12}, journal={Tree Physiology}, author={Saborio, F. and Dvorak, William S. and Donahue, J. K. and Thorpe, T. A.}, year={1997}, pages={787–796} }
 @article{donahue_upton_1996, title={Geographic variation in leaf, cone and seed morphology of Pinus greggii in native forests}, volume={82}, ISSN={["0378-1127"]}, DOI={10.1016/0378-1127(95)03677-6}, abstractNote={Pinus greggii Engelm. occurs in two separate regions in Mexico. Northern populations grow in colder, drier climates than southern populations. Southern populations have been shown to grow faster than northern populations in genetic field trials. This study was conducted to determine whether trees from northern populations could be distinguished from southern populations using basic morphological characteristics. Leaf and cone specimens were collected from 177 individual trees of Pinus greggii from 12 native populations, representing a wide ranging sample from both of the two separate regions in Mexico. Twenty leaf, cone and seed characteristics were measured, and discriminant and multivariate analyses of variation performed on the data. Results of the discriminant analyses, using 17 traits, show that the southern populations are morphologically different from the northern populations, and that the southern populations have more variation. In multivariate analyses of variation, seven morphological traits were found to be useful in discriminating northern trees from southern trees: needle length, needle width, number of stomata, number of internal resin canals, seed wing width, seed weight and seed coat thickness. Needle length was the one single trait which distinguished the two groups of populations.}, number={1-3}, journal={FOREST ECOLOGY AND MANAGEMENT}, author={Donahue, JK and Upton, JL}, year={1996}, month={Apr}, pages={145–157} }
 @article{donahue_perry_squillace_liu_1995, title={Geographic variation in stem-xylem terpene chemistry in native populations of Pinus greggii Engelm}, volume={2}, number={4}, journal={Forest Genetics}, author={Donahue, J. K. and Perry, J. P., Jr. and Squillace, A. E. and Liu, S.}, year={1995}, pages={217} }
 @article{donahue_dvorak_gutierrez_1991, title={The distribution, ecology, and gene conservation of Pinus ayacahuite and P. chiapensis in Mexico and Central America}, number={8}, journal={CAMCORE Bulletin on Tropical Forestry}, publisher={Central America & Mexico Coniferous Resources Cooperative (CAMCORE)}, author={Donahue, J. K. and Dvorak, W. S. and Gutierrez, E. A.}, year={1991}, pages={28} }
 @article{donahue_1990, title={The CAMCORE closed-cone pine seed collections in Central America and Mexico}, number={6}, journal={CAMCORE Bulletin on Tropical Forestry}, publisher={Central America & Mexico Coniferous Resources Cooperative (CAMCORE)}, author={Donahue, J. K.}, year={1990}, pages={25} }
 @article{piesman_mather_donohue_levine_campbell_karakashian_spielman_1986, title={Comparative prevalence of Babesia microti and Borrelia burgdorferi in 4 populations of Ixodes dammini in Eastern Massachusetts}, volume={43}, journal={Acta Tropica}, author={Piesman, J. and Mather, T. S. and Donohue, J. and Levine, J. F. and Campbell, J. and Karakashian, K. and Spielman, A.}, year={1986}, pages={263–270} }
 @article{donahue_dvorak_gutierrez_kane_1985, title={Abies guatemalensis: A two year status report}, number={3}, journal={CAMCORE Bulletin on Tropical Forestry}, author={Donahue, J. K. and Dvorak, W. S. and Gutierrez, E. A. and Kane, M. B.}, year={1985}, pages={17} }