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Shoot production and in vitro performance of Juglans nigra L and Quercus rubra L. was studied where 0, 3, 10, 30, or 100mM benzyladenine (BA) in a 20% white exterior latex paint diluted with deionized water were applied separately to 40 cm branch segments to determine the most effective concentration of benzyladenine on bud break and shoot growth. Softwood shoot production was maximized in the harvest months of March and April for J. nigra. Softwood shoot production was maximized in the harvest months of April and August for Q. rubra. Both shoot number and shoot length of softwood shoots decreased linearly with increasing BA concentrations applied to the branch segments of both species. Shoot production also decreased for both species during the dormant season September-December. The softwood shoots were surface disinfested and established on either 0 or 5µM Long Preece medium. When all BA treated softwood shoots were compared to the controls, the BA in the medium caused a significant increase in the number of shoots produced by explants obtained from the branch segments painted with BA. Painting with BA also increased shoot production in vitro, only if BA was also in the medium. Nodal explants cultured on 5µM LP medium taken from softwood shoots forced from branch segments painted with 3mM BA produced more shoots than any other BA concentration applied to branch segments except nodal explants on 5µM LP medium taken from softwood shoots forced from branch segments painted with 30mM BA.

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Physical characteristics of a site that plant species inhabit may be useful in deriving the range of the species. Current range maps for tree species of the United States were originally developed by Elbert Little. These range maps were based primarily on observations. The purpose of this study was to update Little’s (Little, 1971) range maps of select southern oak species in Mississippi by calculating the topological, soil, and climatic features of sites using a Geographic Information System (GIS) to analyze environmental variables associated with species distributions. Data collected from databases were input into ArcMap and site data extracted using Hawth’s Analyst Tools. Stepwise logistic regression performed with site variables yielded the parameters used in predictive models to generate probability maps for each species across Mississippi. These probability maps demonstrate the potential to efficiently manage forests by giving a more encompassing view of species occurrence.