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Remote Sens. 2017, 9(6), 604; doi:10.3390/rs9060604

Do Daily and Seasonal Trends in Leaf Solar Induced Fluorescence Reflect Changes in Photosynthesis, Growth or Light Exposure?

1
Centre for Sustainable Ecosystem Solutions, School of Biological Sciences, University of Wollongong, Wollongong 2522, Australia
2
Department of Remote Sensing, Global Change Research Institute CAS, Bělidla 986/4a, CZ-60300 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editors: Jose Moreno and Prasad S. Thenkabail
Received: 30 March 2017 / Revised: 9 June 2017 / Accepted: 11 June 2017 / Published: 14 June 2017
View Full-Text   |   Download PDF [2679 KB, uploaded 19 June 2017]   |  

Abstract

Solar induced chlorophyll fluorescence (SIF) emissions of photosynthetically active plants retrieved from space-borne observations have been used to improve models of global primary productivity. However, the relationship between SIF and photosynthesis in diurnal and seasonal cycles is still not fully understood, especially at large spatial scales, where direct measurements of photosynthesis are unfeasible. Motivated by up-scaling potential, this study examined the diurnal and seasonal relationship between SIF and photosynthetic parameters measured at the level of individual leaves. We monitored SIF in two plant species, avocado (Persea Americana) and orange jasmine (Murraya paniculatta), throughout 18 diurnal cycles during the Southern Hemisphere spring, summer and autumn, and compared them with simultaneous measurements of photosynthetic yields, and leaf and global irradiances. Results showed that at seasonal time scales SIF is principally correlated with changes in leaf irradiance, electron transport rates (ETR) and constitutive heat dissipation (YNO; p < 0.001). Multiple regression models of correlations between photosynthetic parameters and SIF at diurnal time scales identified leaf irradiance as the principle predictor of SIF (p < 0.001). Previous studies have identified correlations between photosynthetic yields, ETR and SIF at larger spatial scales, where heterogeneous canopy architecture and landscape spatial patterns influence the spectral and photosynthetic measurements. Although this study found a significant correlation between leaf-measured YNO and SIF, future dedicated up-scaling experiments are required to elucidate if these observations are also found at larger spatial scales. View Full-Text
Keywords: light induced fluorescence transient; photosynthetic yield; photosynthetic active radiation; remote sensing of vegetation; pulse amplitude modulation light induced fluorescence transient; photosynthetic yield; photosynthetic active radiation; remote sensing of vegetation; pulse amplitude modulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Supplementary materials

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  • Externally hosted supplementary file 1
    Link: https://youtu.be/QpWW5drJ2No
    Description: Video S2. Video can be found at: https://youtu.be/QpWW5drJ2No and shows a time-lapse of LIFT and QE Pro measurements of six avocado leaves collected from the UOW. Using a computer controlled tripod the LIFT and QE Pro can be sequentially moved between white reference measurements (white panels) and avocado leaves (figure 1). Inset top right, shows the measurement perspective of the LIFT instrument, where the blue flashes are LIFT QA measurements. Additionally, on each leaf a small LS-C micro quantum light sensors can be seen, which was utilized for measurement of leaf PAR.

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MDPI and ACS Style

Wyber, R.; Malenovský, Z.; Ashcroft, M.B.; Osmond, B.; Robinson, S.A. Do Daily and Seasonal Trends in Leaf Solar Induced Fluorescence Reflect Changes in Photosynthesis, Growth or Light Exposure? Remote Sens. 2017, 9, 604.

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