Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 429791
Title Measuring Whole Plant Light Absorption using a Spectrogoniophotometer
Author(s) Kalaitzoglou, P.; Bartholomeus, H.; Onac, E.; Ieperen, W. van; Harbinson, J.; Marcelis, L.F.M.
Source In: Proceedings of the 7th International Symposium on Light in Horticultural Systems (Book of Abstracts). - Leuven : ISHS - p. 176 - 176.
Event Leuven : ISHS VII International Symposium on Light in Horticultural Systems, Wageningen, 2012-10-15/2012-10-18
Department(s) Horticultural Supply Chains
Laboratory of Geo-information Science and Remote Sensing
WUR GTB Gewasfysiologie Management en Model
PE&RC
Publication type Abstract in scientific journal or proceedings
Publication year 2012
Abstract There are two ways that light spectrum and intensity can affect plant productivity: through the regulation of the photosynthetic rates of leaves, and through the processes of photomorphogenesis that occur at either the leaf or the whole plant level. Regulation of plant morphology through the control of its photomorphogenetic processes strongly affects the total amount of light being absorbed and the way that light absorption is distributed over the whole plant. Light absorption, being the principal driving force behind plant photosynthesis, is an important factor for determining biomass production. It depends on plant optical and architectural characteristics, such as the scattering properties, number and geometry of organs, i.e. their shape, size and position within the plant. In order to study how plant architecture affects total light absorption, an accurate method needs to be developed to measure light absorption by whole plants. The aim of this research is to develop a method for quantifying the light absorption of a single tomato plant. A spectrogoniophotometric system was used to measure light absorption of an artificial plant having optical properties similar to the natural leaves. The plant was illuminated with a collimated light beam (Ø40 cm) produced by an array of white LEDs (400 – 800 nm). Incident light was reflected, absorbed or transmitted through the plant-body, and some radiation did not interact with it at all. A spectrophotometer was used to take measurements of the spectral light intensity (at sub nm resolution in the spectral range 400 - 800 nm) from 128 view angles around the plant, at a distance of 40 cm from plant’s centre. Light absorption was calculated by subtracting the amount of total reflected and transmitted radiation from the total incident radiation. This process was repeated for a number of different plant architectures, light incident angles and spectra
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