20553406

Source:http://linkedlifedata.com/resource/pubmed/id/20553406

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Predicate	Object
rdf:type	pubmed:Citation
lifeskim:mentions	umls-concept:C0023693, umls-concept:C0029144, umls-concept:C0205219, umls-concept:C0242485, umls-concept:C0242724, umls-concept:C0871161
pubmed:issue	5
pubmed:dateCreated	2010-11-5
pubmed:abstractText	Measuring leaf light absorptance is central to many areas of plant biology including photosynthesis and energy balance. Absorptance is calculated from measured values of transmittance and reflectance, and most such measurements have used direct beam light. However, photosynthesis and other processes can differ under direct and diffuse light. Optical properties under diffuse light may be different, but there have been technical difficulties involved in measuring total reflectance of diffuse light. We developed instrumentation to measure this reflectance using a chopped measuring beam delivered alternately to sample and reference integrating spheres, and lock-in detection. We also built instrumentation for measuring transmittance of diffuse light. We developed standards to calibrate our instruments and correct for substitution error, a known systematic error with integrating sphere-based measurements. Helianthus annuus leaves measured under diffuse light reflected 5-10% more and transmitted a few percent less 400-700?nm light than under direct light. Overall absorptance was only a few percent higher under direct light, but leaves may utilize absorbed direct and diffuse light differently. For example, of the light entering the leaf, significantly more direct light than diffuse light is transmitted through the leaf, suggesting differences in localization of absorption within the leaf.
pubmed:language	eng
pubmed:journal	http://linkedlifedata.com/resource/pubmed/journal/0376425
pubmed:citationSubset	IM
pubmed:status	MEDLINE
pubmed:issn	1751-1097
pubmed:author	pubmed-author:BrodersenCraig RCR, pubmed-author:GortonHolly LHL, pubmed-author:VogelmannThomas CTC, pubmed-author:WilliamsWilliam EWE
pubmed:copyrightInfo	© 2010 The Authors. Journal Compilation. The American Society of Photobiology.
pubmed:issnType	Electronic
pubmed:volume	86
pubmed:owner	NLM
pubmed:authorsComplete	Y
pubmed:pagination	1076-83
pubmed:meshHeading	pubmed-meshheading:20553406-Absorption, pubmed-meshheading:20553406-Light, pubmed-meshheading:20553406-Plant Leaves
pubmed:articleTitle	Measurement of the optical properties of leaves under diffuse light.
pubmed:affiliation	Department of Biology, St Mary's College of Maryland, St Mary's City, MD, USA. hlgorton@smcm.edu
pubmed:publicationType	Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't