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Title:   Author  item
                                            Gitz, Dennisitem
                                            Ritchie, Jerryitem
                                            Krizek, Donalditem
                                            Baker, Jeffreyitem
                                            Reddy, Vangimalla
  Submitted to: Eastern Native Grass Symposium
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 3/15/2002
                                    Publication  Date: 10/21/2004
                                    Citation: GITZ, D.C., RITCHIE, J.C., KRIZEK, D.T., BAKER, J.T., REDDY, V.R. 2004. PROCEEDINGS OF THE THIRD EASTERN NATIVE GRASS SYMPOSIUM, THE NORTH CAROLINA BOTANICAL GARDEN, CHAPEL HILL, NC. P. 308.Interpretive Summary:
                                Technical Abstract: Eastern gamagrass [Tripsacum dactyloides (L.) L.] was grown in large 1 m3 bins on a sand:vermiculite mix with regular fertigation with a complete nutrient solution in closed transparent cuvettes (Soil Plant Atmosphere Research (SPAR) sunlit chambers) at 370 or 740 ppm CO2 and 20/14, 27.5/21.5 or 35/29 degree day/night temperatures.  Plants were allowed to develop  from mid-May to mid-October.  Leaf and canopy photosynthesis was investigated.  Results from leaf based observations were consistent with canopy level observations.  Temperature effects on assimilation were much more pronounced than CO2 effects.  Increased temperatures led to increased maximal assimilation rates, and quantum use efficiencies as Fv/Fm and CO2 assimilation vs PAR.  In plants grown at lowest temperatures the maximum rate of carbon assimilation was reached at relatively low flux densities (maximal flux utilization 1500 umol m 2 s-1 PAR) as compared to high  temperature plants (2500 umol m 2 s-1).  Enhanced CO2 consistently decreased maximal flux utilization across treatments.  This effect was most pronounced in plants grown at the lowest temperature regime.


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