Promotie

Variability in light absorption and photosynthesis within tomato canopies: a 3D model assisted analysis

Promovendus M (Maarten) van der Meer PhD
Promotor prof.dr.ir. LFM (Leo) Marcelis
Externe copromotor Dr E.P. Heuvelink
Dr Pieter H.B. de Visser
Organisatie Wageningen University
Datum

wo 28 september 2022 11:00 tot 12:30

Locatie Omnia, gebouwnummer 105
Hoge Steeg 2
6708 PH Wageningen
+31 (0)317 - 484 500
Zaal/kamer Groot Auditorium

Samenvatting

Light distribution in canopies is important for crop photosynthesis, growth and yield. In this thesis variability in light absorption and photosynthesis within tomato canopies was explored with a 3D model assisted analysis. There were four main findings. Firstly, due to plant acclimation, row orientation had a minimal influence on canopy light absorption and net photosynthesis. Secondly, including interplant variation in architectural and photosynthesis parameters is a cumbersome effort which does not have a large impact on simulated averages of a canopy. Thirdly, locally supplied far-red light has long-distance effects on length, dry weight of the stem and on specific leaf area. This is a clear indicator that future studies on light spectrum should look into the integration of light spectrum perceived on different heights of the plant. Fourthly, leaflets in intra-canopy lighting generally have a more uniform overall light absorption.