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000008362 0247_ $$2DOI$$a10.1016/j.plaphy.2009.06.002
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000008362 084__ $$2WoS$$aPlant Sciences
000008362 1001_ $$0P:(DE-HGF)0$$aGreer, D.H.$$b0
000008362 245__ $$aLeaf photosynthetic and solar-tracking responses of mallow, Malva parviflora, to photon flux density
000008362 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2009
000008362 300__ $$a946 - 953
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000008362 440_0 $$022002$$aPlant Physiology and Biochemistry$$v47$$x0981-9428$$y10
000008362 500__ $$aWe thank Wayne Scott for technical assistance for this project. The study was also technically supported by Evert Van Thoor while on an Internship from Wageningen University and Research Centre for a Masters degree in Agricultural Engineering. We also thank SAS Australia for their generous support to the senior author for supplying software.
000008362 520__ $$aMalva parviflora L. (mallow) is a species that occupies high-light habitats as a weedy invader in orchards and vineyards. Species of the Malvaceae are known to solar track and anecdotal evidence suggests this species may also. How M. parviflora responds physiologically to light in comparison with other species within the Malvaceae remains unknown. Tracking and photosynthetic responses to photon flux density (PFD) were evaluated on plants grown in greenhouse conditions. Tracking ability was assessed in the growth conditions and by exposing leaves to specific light intensities and measuring changes in the angle of the leaf plane. Light responses were also determined by photosynthesis and chlorophyll fluorescence. Leaves followed a heliotropic response which was highly PFD-dependent, with tracking rates increasing in a curvilinear pattern. Maximum tracking rates were up to 20 degrees h(-1) and saturated for light above 1,300 micromol (photons) m(-2) s(-1). This high-light saturation, both for tracking (much higher than the other species), and for photosynthesis, confirmed mallow as a high-light demanding species. Further, because there was no photoinhibition, the leaves could capture the potential of an increased carbon gain in higher irradiance by resorting to solar tracking. Modelling suggested the tracking response could increase the annual carbon gain by as much as 25% compared with leaves that do not track the sun. The various leaf attributes associated with solar tracking, therefore, help to account for the success of this species as a weed in many locations worldwide.
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000008362 650_2 $$2MeSH$$aCarbon: metabolism
000008362 650_2 $$2MeSH$$aChlorophyll: chemistry
000008362 650_2 $$2MeSH$$aChlorophyll: metabolism
000008362 650_2 $$2MeSH$$aEcosystem
000008362 650_2 $$2MeSH$$aFluorescence
000008362 650_2 $$2MeSH$$aMalva: metabolism
000008362 650_2 $$2MeSH$$aMalva: physiology
000008362 650_2 $$2MeSH$$aModels, Biological
000008362 650_2 $$2MeSH$$aPhotons
000008362 650_2 $$2MeSH$$aPhotosynthesis: radiation effects
000008362 650_2 $$2MeSH$$aPlant Leaves: metabolism
000008362 650_2 $$2MeSH$$aPlant Leaves: physiology
000008362 650_2 $$2MeSH$$aSeasons
000008362 650_2 $$2MeSH$$aSunlight
000008362 650_2 $$2MeSH$$aTime Factors
000008362 650_7 $$01406-65-1$$2NLM Chemicals$$aChlorophyll
000008362 650_7 $$07440-44-0$$2NLM Chemicals$$aCarbon
000008362 650_7 $$2WoSType$$aJ
000008362 65320 $$2Author$$aMalva parviflora
000008362 65320 $$2Author$$aCarbon gain
000008362 65320 $$2Author$$aChlorophyll fluorescence
000008362 65320 $$2Author$$aLight response
000008362 65320 $$2Author$$aLeaf angle
000008362 65320 $$2Author$$aPhotosynthesis
000008362 65320 $$2Author$$aSun tracking
000008362 7001_ $$0P:(DE-Juel1)VDB67249$$aThorpe, M.R.$$b1$$uFZJ
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000008362 8567_ $$uhttp://dx.doi.org/10.1016/j.plaphy.2009.06.002
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