Photosynthetica 2002, 40(1):127-132 | DOI: 10.1023/A:1020131332107

Remote Sensing of Solar-excited Plant Fluorescence as a Measure of Photosynthetic Rate

A. Freedman1, J. Cavender-Bares2, P.L. Kebabian2, R. Bhaskar2, H. Scott1, F.A. Bazzaz2
1 Center for Materials, Technology, Aerodyne Research, Inc., Billerica, USA
2 Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, USA

Leaf level net photosynthetic rates (PN) of laurel oak (Quercus hemispherica) juveniles grown under contrasting nutrient and CO2 regimes were negatively correlated with red to far-red ratios, R/FR (690/760 nm), steady-state, solar-excited fluorescence ratios (r2 = 0.66, n = 12) measured across 12 plant canopies. Laurel oak juveniles that had been subjected to nitrogen stress over a period of a year demonstrated higher R/FR than their counterparts that had been provided with sufficient nitrogen. Plants that had been grown at elevated CO2 concentrations, EC [700 μmol (CO2) mol-1] also exhibited significantly higher R/FR when subjected to normal ambient carbon dioxide concentrations than their counterparts grown under ambient concentrations, AC [380 μmol (CO2) mol-1]. All fluorescence measurements were obtained by observing a multi-plant canopy using a unique solar-blind passive sensor. This sensor, which utilizes Fraunhofer-line discrimination techniques, detects radiation at the cores of the lines comprising the atmospheric oxygen A- and B-bands, centered at 762 and 688 nm, respectively. These results support the use of solar-excited steady-state plant fluorescence as a potential tool for remote measurement of canopy radiation use efficiency.

Additional key words: chlorophyll; CO2 concentration; laurel oak; nitrogen; Quercus; photon use efficiency; R, FR ratio

Published: March 1, 2002  Show citation

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Freedman, A., Cavender-Bares, J., Kebabian, P.L., Bhaskar, R., Scott, H., & Bazzaz, F.A. (2002). Remote Sensing of Solar-excited Plant Fluorescence as a Measure of Photosynthetic Rate. Photosynthetica, 40(1), 127-132. doi: 10.1023/A:1020131332107
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