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Research Interests
Professor Roalson's research has three primary foci: (1) understanding processes that lead to speciation and diversification of flowering plant groups; (2) understanding mechanisms of cytogenetic change, particularly the evolution of agmatoploid chromosome number change in the Cyperales; and (3) understanding the evolutionary dynamics of morphological traits important to diversification. Construction of phylogenetic hypotheses is an integral part of all of these research interests. By combining phylogenetic analyses with field, laboratory, and greenhouse studies, he seeks to understand the evolutionary dynamics of morphological and cytological characteristics.
Representative Publications
Akhani, H., G. E. Edwards, and E. H. Roalson. 2007. Diversification of the Old World Salsoleae s.l. (Chenopodiaceae): Molecular phylogenetic analysis of nuclear and chloroplast datasets and a revised classification. International Journal of Plant Sciences 168(6): 931-956.
Murphy, L. R., J. Barroca, V. R. Franceschi, R. Lee, E. H. Roalson, G. E. Edwards, and M. S. B. Ku. 2007. Diversity and plasticity of C4 photosynthesis in Eleocharis (Cyperaceae). Functional Plant Biology 34(7): 571-580.
Garikipati, D. K., S. A. Gahr, E. H. Roalson, and B. D. Rodgers. 2007. Characterization of rainbow trout myostatin-2 genes (rtMSTN-2a & -2b): Genomic organization, differential expression and psuedogenization. Endocrinology 148(5): 2106-2115.
Roalson, E. H., J. K. Boggan, and L. E. Skog. 2005. Reorganization of tribal and generic boundaries in the Gloxinieae (Gesneriaceae: Gesnerioideae) and the description of a new tribe in the Gesnerioideae, Sphaerorrhizeae. Selbyana 25(2): 225-238.
Roalson, E. H., J. K. Boggan, L. E. Skog, and E. A. Zimmer. 2005. Untangling Gloxinieae (Gesneriaceae). I. Phylogenetic patterns and generic boundaries inferred from nuclear, chloroplast, and morphological cladistic data sets. Taxon 54(2): 389-410.
McCubbin, A. G. and E. H. Roalson. 2005. Construction of bacterial artificial chromosome libraries for use in phylogenetic studies. Pp. 384-399 in Methods in Enzymology, Volume 395. Producing the Biochemical Data, Part B. E. A. Zimmer and E. H. Roalson, eds. Elsevier Science/Academic Press.
Roalson, E. H. and E. A. Friar. 2004a. Phylogenetic relationships and biogeographic patterns in Carex section Acrocystis (Cyperaceae) using nrDNA ITS and ETS sequence data. Plant Systematics and Evolution 243: 175-187.
Roalson, E. H. and E. A. Friar. 2004b. Phylogenetic analysis of the nuclear alcohol dehydrogenase (Adh) gene family in Carex section Acrocystis (Cyperaceae) and combined analyses of Adh and nuclear ribosomal ITS and ETS sequences for inferring species relationships. Molecular Phylogenetics and Evolution 33: 671-686.
Roalson, E. H., L. E. Skog, and E. A. Zimmer. 2003. Phylogenetic relationships and the diversification of floral form in Achimenes (Gesneriaceae). Systematic Botany 28(3): 593-608.