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

Field phenotyping of ten wheat cultivars under elevated CO2 shows seasonal differences in chlorophyll fluorescence, plant height and vegetation indices. Knopf, O., Castro, A., Bendig, J., Pude, R., Kleist, E., Poorter, H., Rascher, U., & Muller, O. Frontiers in Plant Science, 14:1304751, January, 2024.

Paper doi abstract bibtex

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 ([CO 2 ]). To investigate growth and photosynthesis dynamics under the effects of ambient (~434 ppm) and elevated [CO 2 ] (~622 ppm), a Free-Air CO 2 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 (F q ’/F m ’) and the kinetics of electron transport, i.e. the reoxidation rates F r1 ’ and F r2 ’. Our results suggest that elevated [CO 2 ] significantly increased F q ’/F m ’ and plant height during the vegetative growth phase. As the plants transitioned to the senescence phase, a pronounced decline in F q ’/F m ’ was observed under elevated [CO 2 ]. This was also reflected in the reoxidation rates F r1 ’ and F r2 ’. 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[CO 2 ]. Our results indicate that the rise in atmospheric [CO 2 ] has significant effects on the cultivation of winter wheat with strong manifestation during early and late growth.

@article{knopf_field_2024,
	title = {Field phenotyping of ten wheat cultivars under elevated {CO2} shows seasonal differences in chlorophyll fluorescence, plant height and vegetation indices},
	volume = {14},
	issn = {1664-462X},
	url = {https://www.frontiersin.org/articles/10.3389/fpls.2023.1304751/full},
	doi = {10.3389/fpls.2023.1304751},
	abstract = {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 ([CO
              2
              ]). To investigate growth and photosynthesis dynamics under the effects of ambient ({\textasciitilde}434 ppm) and elevated [CO
              2
              ] ({\textasciitilde}622 ppm), a Free-Air CO
              2
              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 (F
              q
              ’/F
              m
              ’) and the kinetics of electron transport, i.e. the reoxidation rates F
              r1
              ’ and F
              r2
              ’. Our results suggest that elevated [CO
              2
              ] significantly increased F
              q
              ’/F
              m
              ’ and plant height during the vegetative growth phase. As the plants transitioned to the senescence phase, a pronounced decline in F
              q
              ’/F
              m
              ’ was observed under elevated [CO
              2
              ]. This was also reflected in the reoxidation rates F
              r1
              ’ and F
              r2
              ’. 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[CO
              2
              ]. Our results indicate that the rise in atmospheric [CO
              2
              ] has significant effects on the cultivation of winter wheat with strong manifestation during early and late growth.},
	urldate = {2024-11-26},
	journal = {Frontiers in Plant Science},
	author = {Knopf, Oliver and Castro, Antony and Bendig, Juliane and Pude, Ralf and Kleist, Einhard and Poorter, Hendrik and Rascher, Uwe and Muller, Onno},
	month = jan,
	year = {2024},
	pages = {1304751},
}

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