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000009981 084__ $$2WoS$$aPlant Sciences
000009981 1001_ $$0P:(DE-Juel1)129388$$aRascher, U.$$b0$$uFZJ
000009981 245__ $$aAltered physiological function, not structure, drives increased radiation-use efficiency of soybean grown at elevated CO2
000009981 260__ $$aDordrecht [u.a.]$$bSpringer Science + Business Media B.V$$c2010
000009981 300__ $$a15 - 25
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000009981 440_0 $$014201$$aPhotosynthesis Research$$v105$$x0166-8595$$y1
000009981 500__ $$aWe thank Tim Mies for technical assistance, and Steve Long for supporting our research at SoyFACE. SoyFACE was supported by the Illinois Council for Food and Agricultural Research, Archer Daniels Midland Company, the U.S. Department of Agricultural, and the Illinois Agricultural Experiment Station. B. Biskup and U. Rascher were supported by a NSF/DAAD grant (grant PPP D/05/50496). B. Biskup also acknowledges support of his PhD thesis by the Heinrich-Heine University of Dusseldorf, Germany. We thank K.G. Rascher for assistance with the statistical analyses, and D. Ort for valuable discussions. We also greatly thank H. Scharr for supporting the development of the stereo system and the development of the analyses algorithms.
000009981 520__ $$aPrevious studies of elevated carbon dioxide concentration ([CO(2)]) on crop canopies have found that radiation-use efficiency is increased more than radiation-interception efficiency. It is assumed that increased radiation-use efficiency is due to changes in leaf-level physiology; however, canopy structure can affect radiation-use efficiency if leaves are displayed in a manner that optimizes their physiological capacity, even though the canopy intercepts the same amount of light. In order to determine the contributions of physiology and canopy structure to radiation-use and radiation-interception efficiency, this study relates leaf-level physiology and leaf display to photosynthetic rate of the outer canopy. We used a new imaging approach that delivers three-dimensional maps of the outer canopy during the growing season. The 3D data were used to model leaf orientation and mean photosynthetic electron transport of the outer canopy to show that leaf orientation changes did not contribute to increased radiation-use; i.e. leaves of the outer canopy showed similar diurnal leaf movements and leaf orientation in both treatments. Elevated [CO(2)] resulted in an increased maximum electron transport rate (ETR(max)) of light reactions of photosynthesis. Modeling of canopy light interception showed that stimulated leaf-level electron transport at elevated [CO(2)], and not alterations in leaf orientation, was associated with stimulated radiation-use efficiency and biomass production in elevated [CO(2)]. This study provides proof of concept of methodology to quantify structure-function relationships in combination, allowing a quantitative estimate of the contribution of both effects to canopy energy conversion under elevated [CO(2)].
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000009981 65320 $$2Author$$aThree-dimensional canopy surface
000009981 65320 $$2Author$$aPhotosynthesis
000009981 65320 $$2Author$$aLight reactions
000009981 65320 $$2Author$$aChlorophyll fluorescence
000009981 65320 $$2Author$$aElevated CO2
000009981 65320 $$2Author$$aGlycine max
000009981 65320 $$2Author$$aStructure-function relations
000009981 650_2 $$2MeSH$$aCarbon Dioxide: pharmacology
000009981 650_2 $$2MeSH$$aElectron Transport: drug effects
000009981 650_2 $$2MeSH$$aPhotosynthesis: drug effects
000009981 650_2 $$2MeSH$$aSoybeans: drug effects
000009981 650_2 $$2MeSH$$aSoybeans: growth & development
000009981 650_2 $$2MeSH$$aSoybeans: physiology
000009981 650_7 $$0124-38-9$$2NLM Chemicals$$aCarbon Dioxide
000009981 650_7 $$2WoSType$$aJ
000009981 7001_ $$0P:(DE-Juel1)VDB62682$$aBiskup, B.$$b1$$uFZJ
000009981 7001_ $$0P:(DE-HGF)0$$aLeakey, A.D.B.$$b2
000009981 7001_ $$0P:(DE-HGF)0$$aMcGrath, J.M.$$b3
000009981 7001_ $$0P:(DE-HGF)0$$aAinsworth, E.A.$$b4
000009981 773__ $$0PERI:(DE-600)1475688-2$$a10.1007/s11120-010-9548-6$$gVol. 105, p. 15 - 25$$p15 - 25$$q105<15 - 25$$tPhotosynthesis research$$v105$$x0166-8595$$y2010
000009981 8567_ $$uhttp://dx.doi.org/10.1007/s11120-010-9548-6
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