Abstract
Vascular plants use carotenoids and chlorophylls a and b to harvest solar energy in the visible region (400-700 nm), but they make little use of the far-red (FR) light. Instead, some cyanobacteria have developed the ability to use FR light by redesigning their photosynthetic apparatus and synthesizing red-shifted chlorophylls. Implementing this strategy in plants is considered promising to increase crop yield. To prepare for this, a characterization of the FR light-induced changes in plants is necessary. Here, we explore the behaviour of Arabidopsis thaliana upon exposure to FR light by following the changes in morphology, physiology and composition of the photosynthetic complexes. We found that after FR-light treatment, the ratio between the photosystems and their antenna size drastically readjust in an attempt to rebalance the energy input to support electron transfer. Despite a large increase in PSBS accumulation, these adjustments result in strong photoinhibition when FR-adapted plants are exposed to light again. Crucially, FR light-induced changes in the photosynthetic membrane are not the result of senescence, but are a response to the excitation imbalance between the photosystems. This indicates that an increase in the FR absorption by the photosystems should be sufficient for boosting photosynthetic activity in FR light.
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Claims 5
Claim · model-written summary
Far-red treatment readjusted photosystem ratio and antenna size.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianat0 - Treatment
- FR-light treatmente0
- Outcome
- ratio between the photosystems and their antenna sizee0
- Direction
- readjuste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after FR-light treatment, the ratio between the photosystems and their antenna size drastically readjust”
t0“Long‐term adaptation of Arabidopsis thaliana to far‐red light”
Claim · model-written summary
PSBS accumulation increased strongly after far-red adaptation.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Gene
- PSBSe0
- Outcome
- PSBS accumulatione0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a large increase in PSBS accumulation”
t0“Long‐term adaptation of Arabidopsis thaliana to far‐red light”
Claim · model-written summary
FR-adapted plants underwent strong photoinhibition when exposed to light again.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- exposed to light againe0
- Outcome
- photoinhibitione0
- Direction
- stronge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these adjustments result in strong photoinhibition when FR-adapted plants are exposed to light again”
t0“Long‐term adaptation of Arabidopsis thaliana to far‐red light”
Claim · model-written summary
The authors attributed membrane changes to photosystem excitation imbalance rather than senescence.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Outcome
- changes in the photosynthetic membranee0
- Qualifier
- excitation imbalance between the photosystemse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FR light-induced changes in the photosynthetic membrane are not the result of senescence, but are a response to the excitation imbalance between the photosystems”
t0“Long‐term adaptation of Arabidopsis thaliana to far‐red light”
Claim · model-written summary
The authors proposed greater far-red absorption as sufficient to boost far-red photosynthetic activity.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Outcome
- photosynthetic activity in FR lighte0
- Direction
- boostinge0
- Qualifier
- increase in the FR absorption by the photosystemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increase in the FR absorption by the photosystems should be sufficient for boosting photosynthetic activity in FR light”
t0“Long‐term adaptation of Arabidopsis thaliana to far‐red light”
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