Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 72, Issue 4, Pages 1295-1306Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/eraa537
Keywords
Gas exchange; hyperspectral images; phenotyping; photosynthesis; plant breeding; solar-induced fluorescence
Categories
Funding
- research project 'Realizing Increased Photosynthetic Efficiency (RIPE)' - Bill & Melinda Gates Foundation
- Foundation for Food and Agriculture Research
- UK Foreign, Commonwealth & Development Office [OPP1172157]
- Global Change and Photosynthesis Research Unit of the USDA Agricultural Research Service
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The combination of time-synchronized hyperspectral images and irradiance spectra can provide a better estimation of SIF and SIF yield, which exhibit a negative correlation with photosynthetic variables. Using SIF yield for J(max) (V-cmax) predictions, the regression analysis demonstrates varying levels of accuracy and RMSE for different groups.
Improving photosynthesis is considered a promising way to increase crop yield to feed a growing population. Realizing this goal requires non-destructive techniques to quantify photosynthetic variation among crop cultivars. Despite existing remote sensing-based approaches, it remains a question whether solar-induced fluorescence (SIF) can facilitate screening crop cultivars of improved photosynthetic capacity in plant breeding trials. Here we tested a hypothesis that SIF yield rather than SIF had a better relationship with the maximum electron transport rate (J(max)). Time-synchronized hyperspectral images and irradiance spectra of sunlight under clear-sky conditions were combined to estimate SIF and SIF yield, which were then correlated with ground-truth V-cmax and J(max). With observations binned over time (i.e. group 1: 6, 7, and 12 July 2017; group 2: 31 July and 18 August 2017; and group 3: 24 and 25 July 2018), SIF yield showed a stronger negative relationship, compared with SIF, with photosynthetic variables. Using SIF yield for J(max) (V-cmax) predictions, the regression analysis exhibited an R-2 of 0.62 (0.71) and root mean square error (RMSE) of 11.88 (46.86) mu mol m(-2) s(-1) for group 1, an R-2 of 0.85 (0.72) and RMSE of 13.51 (49.32) mu mol m(-2) s(-1) for group 2, and an R-2 of 0.92 (0.87) and RMSE of 15.23 (30.29) mu mol m(-2) s(-1) for group 3. The combined use of hyperspectral images and irradiance measurements provides an alternative yet promising approach to characterization of photosynthetic parameters at plot level.
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