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000009362 084__ $$2WoS$$aPlant Sciences
000009362 1001_ $$0P:(DE-Juel1)129379$$aPieruschka, R.$$b0$$uFZJ
000009362 245__ $$aPhotosynthesis in lightfleck areas of homobaric and heterobaric leaves
000009362 260__ $$aOxford$$bUniv. Press$$c2010
000009362 300__ $$a1031 - 1039
000009362 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000009362 440_0 $$03318$$aJournal of Experimental Botany$$v61$$x0022-0957$$y4
000009362 500__ $$aWe are indebted to Dr Shizue Matsubara for critical reading of the manuscript. This work was part of the doctoral thesis of RP at Mathematisch-Naturwissenschaftliche Fakultat, Heinrich-Heine Universitat, Dusseldorf, Germany.
000009362 520__ $$aLeaves within a canopy are exposed to a spatially and temporally fluctuating light environment which may cause lateral gradients in leaf internal CO(2) concentration and diffusion between shaded and illuminated areas. In previous studies it was hypothesized that lateral CO(2) diffusion may support leaf photosynthesis, but the magnitude of this effect is still not well understood. In the present study homobaric leaves of Vicia faba or heterobaric leaves of Glycine max were illuminated with lightflecks of different sizes, mimicking sunflecks. Photosynthetic properties of the lightfleck areas were assessed with combined gas exchange measurements and chlorophyll fluorescence imaging. Lateral diffusion in homobaric leaves with an interconnected intercellular air space stimulated photosynthesis and the effect was largest in small lightfleck areas, in particular when plants were under drought stress. Such effects were not observed in the heterobaric leaves with strongly compartmented intercellular gas spaces. It is concluded that lateral diffusion may significantly contribute to photosynthesis of lightfleck areas of homobaric leaves depending on lightfleck size, lateral diffusivity, and stomatal conductance. Since homobaric leaf structures have been reported for many plant species, it is hypothesized that leaf homobary may have an impact on overall plant performance under conditions with a highly heterogeneous light environment.
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000009362 65320 $$2Author$$aDrought stress
000009362 65320 $$2Author$$aheterobaric leaves
000009362 65320 $$2Author$$ahomobaric leaves
000009362 65320 $$2Author$$alateral CO2 diffusion
000009362 65320 $$2Author$$aphotosynthesis
000009362 65320 $$2Author$$asunflecks
000009362 650_2 $$2MeSH$$aCarbon Dioxide: chemistry
000009362 650_2 $$2MeSH$$aCarbon Dioxide: metabolism
000009362 650_2 $$2MeSH$$aDiffusion
000009362 650_2 $$2MeSH$$aKinetics
000009362 650_2 $$2MeSH$$aLight
000009362 650_2 $$2MeSH$$aPhotosynthesis: radiation effects
000009362 650_2 $$2MeSH$$aPlant Leaves: anatomy & histology
000009362 650_2 $$2MeSH$$aPlant Leaves: chemistry
000009362 650_2 $$2MeSH$$aPlant Leaves: metabolism
000009362 650_2 $$2MeSH$$aPlant Leaves: radiation effects
000009362 650_2 $$2MeSH$$aSoybeans: anatomy & histology
000009362 650_2 $$2MeSH$$aSoybeans: chemistry
000009362 650_2 $$2MeSH$$aSoybeans: metabolism
000009362 650_2 $$2MeSH$$aSoybeans: radiation effects
000009362 650_2 $$2MeSH$$aVicia faba: anatomy & histology
000009362 650_2 $$2MeSH$$aVicia faba: chemistry
000009362 650_2 $$2MeSH$$aVicia faba: metabolism
000009362 650_2 $$2MeSH$$aVicia faba: radiation effects
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000009362 7001_ $$0P:(DE-HGF)0$$aChavarria-Krauser, A.$$b1
000009362 7001_ $$0P:(DE-Juel1)129402$$aSchurr, U.$$b2$$uFZJ
000009362 7001_ $$0P:(DE-Juel1)129336$$aJahnke, S.$$b3$$uFZJ
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