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ARS Home Plains Area Lubbock, Texas Cropping Systems Research Laboratory Wind Erosion and Water Conservation Research Research Publications at this Location





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Title:   Author  item
                                            Gitz, Dennisitem
                                            Payton, Paxtonitem
                                            Franks, Cleveitem
                                            Xin, Zhanguo
  Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 10/31/2004
                                    Publication  Date: 11/4/2004
                                    Citation: Gitz, D.C., Payton, P.R., Franks, C.D., Xin, Z. 2004. Stomatal distribution and gas exchange of sorghum lines with contrasting water-use efficiencies [abstract]. Agronomy Abstracts, ASA-CSSA-SSSA Annual Meeting. 2004 CDROM.Interpretive Summary:
                                Technical Abstract: Sorghum is grown in semi-arid regions as both a grain and forage crop. Identification of specific anatomical and physiological characteristics which contribute to the water-use efficiency (WUE) of both grain and forage production in breeding and  mutant lines would be useful in cultivar development. Sorghum lines were grown for 3-4 weeks on a peat mix in the greenhouse. Long term WUE of biomass accretion and instantaneous WUE of net assimilation were found to be inversely related to stomatal conductance and transpiration rates of individual leaves and whole plants. Leaf photosynthetic performance was generally a poor indicator of WUE in the lines investigated. We concluded that epidermal characteristics contributed more to WUE than mesophyll photosynthetic processes. Stomatal conductance has no measurable effect on biomass accretion. However, physiological WUE parameters of plants in the vegetative stage may not always predict lines previously identified as drought tolerant with regard to grain yield.


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