Frontiers in Plant Science (Jan 2024)

Field phenotyping of ten wheat cultivars under elevated CO2 shows seasonal differences in chlorophyll fluorescence, plant height and vegetation indices

  • Oliver Knopf,
  • Antony Castro,
  • Juliane Bendig,
  • Ralf Pude,
  • Einhard Kleist,
  • Hendrik Poorter,
  • Hendrik Poorter,
  • Uwe Rascher,
  • Onno Muller

DOI
https://doi.org/10.3389/fpls.2023.1304751
Journal volume & issue
Vol. 14

Abstract

Read online

In the context of climate change and global sustainable development goals, future wheat cultivation has to master various challenges at a time, including the rising atmospheric carbon dioxide concentration ([CO2]). To investigate growth and photosynthesis dynamics under the effects of ambient (~434 ppm) and elevated [CO2] (~622 ppm), a Free-Air CO2 Enrichment (FACE) facility was combined with an automated phenotyping platform and an array of sensors. Ten modern winter wheat cultivars (Triticum aestivum L.) were monitored over a vegetation period using a Light-induced Fluorescence Transient (LIFT) sensor, ground-based RGB cameras and a UAV equipped with an RGB and multispectral camera. The LIFT sensor enabled a fast quantification of the photosynthetic performance by measuring the operating efficiency of Photosystem II (Fq’/Fm’) and the kinetics of electron transport, i.e. the reoxidation rates Fr1’ and Fr2’. Our results suggest that elevated [CO2] significantly increased Fq’/Fm’ and plant height during the vegetative growth phase. As the plants transitioned to the senescence phase, a pronounced decline in Fq’/Fm’ was observed under elevated [CO2]. This was also reflected in the reoxidation rates Fr1’ and Fr2’. A large majority of the cultivars showed a decrease in the harvest index, suggesting a different resource allocation and indicating a potential plateau in yield progression under e[CO2]. Our results indicate that the rise in atmospheric [CO2] has significant effects on the cultivation of winter wheat with strong manifestation during early and late growth.

Keywords