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Title:   Author  item
                                            Gitz, Dennisitem
                                            Ritchie, Jerryitem
                                            Krizek, Donalditem
                                            Baker, Jeffreyitem
                                            Reddy, Vangimalla
  Submitted to: ASA-CSSA-SSSA Proceedings
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 11/11/2002
                                    Publication  Date: 8/20/2002
                                    Citation: GITZ, D.C., RITCHIE, J.C., KRIZEK, D.T., BAKER, J.T., REDDY, V.R. 2002 [ABSTRACT]. 2002 ANNUAL MEETING OF THE AMERICAN SOCIETY OF AGRONOMY ABSTRACTS [[CD-ROM]. A03-GITZ133920-POSTER.Interpretive Summary:
                                Technical Abstract: Eastern gamagrass [Tripsacum dactyloides (L.) L.] was grown in
large 1 m3 bins on a sand:vermiculite mix with regular
application of a complete nutrient solution in closed sunlit
chambers (Soil Plant Atmosphere Research (SPAR) chambers) at 370
or 740 umol mol-1 CO2 and 20/14°, 27.5/21.5° or 35/29° day/night
temperatures.  Plants were allowed to develop from mid-May to
mid-October.  Leaf and canopy photosynthesis were 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 increased quantum
use efficiencies (as Fv/Fm and CO2 assimilation vs PAR).  In
plants grown at lowest temperature the maximum rate of carbon
assimilation was reached at relatively low PAR flux densities
(1500 umol m-2 s-1 PAR) as compared to high temperature plants
(2500 umol m-2 s-1).  We found no conclusive evidence of a CO2
effect on carbon assimilation in these plants.


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