Abstract
The laser-induced fluorescence transient (LIFT) method is a non-invasive remote sensing technique for measurement of photosynthetic performance of plants under laboratory and field conditions. We report here a long-term comparative study to monitor the performance of different cultivars of barley and sugar beet during the growth season of these crops. The LIFT measurements provided useful results about photosynthetic light use efficiency on selected leaves in the canopy of the studied crops. The different canopy architectures, with different optical properties, influenced the LIFT measurements.
Highlights
Photosynthesis is the key process that drives plant life on earth
The photosynthetic light-use efficiency was measured on four cultivars of barley and sugar beet with Monitoring-PAM and by the laser-induced fluorescence transient (LIFT) instrument, which was placed on a tower next to the plots (Figure 1)
The PPFD diurnal course was similar for both instruments but with lower absolute values measured by the light sensors mounted on the Monitoring-PAM compared to the light sensors of the weather station (Figure 3a,b)
Summary
Photosynthesis is the key process that drives plant life on earth. The understanding of the biophysical processes that affect plants photosynthesis has stimulated generations of scientists and is important to improve agricultural production to support the expanding needs of the growing human population.Photosynthetic processes are driven by both internal and external factors [1] in which the cellular and leaf-level processes have been extensively studied under laboratory conditions. Measuring photosynthetic performance at the stand or ecosystem level is challenging and has far only been. Within the last few decades, chlorophyll fluorescence has become an important tool for measuring photosynthetic performance at different ecosystem levels. The pulse-amplitude-modulation (PAM) approach [4] has proven to be an important tool to measure photosynthesis in an active manner, whereas on the canopy level, sun-induced fluorescence (SIF) provides a way to assess photosynthetic processes passively over vast areas [5,6]. For non-invasive plant phenotyping, Fiorani and Schurr [7] concluded that the active measurement of the photosynthetic status is an important approach to provide “quantitative analyses of plant structure and function relevant for traits that help plants better adapt to low-input agriculture and resource-limited environments.”
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