Abstract
Abstract While natural light in plant canopies often fluctuates and shows a large range of possible intensities, the rate of photosynthetic induction is often measured at only two light intensities. This prompts the question as to how the relationship between different light intensities and the rate of photosynthetic induction can be characterized. Using hundreds of measurements of photosynthetic induction at various light intensities in leaves of tomato ( Solanum lycopersicum ), we found linear relationships between the time to reach 50% of full photosynthetic induction (t 50 ) and the difference between steady-state photosynthesis rates at low and at high light intensities (Δ A ). This relationship was strongest at low leaf-to-air vapour pressure deficits (0.5-1.0 kilopascal), and when dark-adapted leaves were excluded. This relationship was documented at different CO 2 mole fractions, namely 400 (R 2 = 0.86), 600 (R 2 = 0.66) and 800 µmol mol − 1 (R 2 = 0.92). A survey of the literature suggested that this relationship also exists in various other tree and herbaceous species. The t 50 - Δ A relationship is particularly useful as proxy for the rate of photosynthetic induction between any two light intensities, through the use of conventional steady-state photosynthesis light response curves. A guide for best practice for characterizing the t 50 - Δ A relationship in the leaves of interest is provided.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Time to 50% of full photosynthetic induction was linearly related to the difference between steady-state photosynthesis at low and high light intensities in tomato leaves.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- various light intensitiese0
- Outcome
- time to reach 50% of full photosynthetic inductione1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at various light intensities in leaves of tomato ( Solanum lycopersicum )”
e1“we found linear relationships between the time to reach 50% of full photosynthetic induction (t 50 ) and the difference between steady-state photosynthesis rates at low and at high light intensities”
Claim · model-written summary
The t50 relationship with the steady-state difference was strongest at low leaf-to-air vapour pressure deficits (0.5-1.0 kilopascal) and when dark-adapted leaves were excluded.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- low leaf-to-air vapour pressure deficitse2
- Outcome
- relationshipe2
- Direction
- strongeste2
- Value
- 0.5-1.0 kilopascale2
- Qualifier
- when dark-adapted leaves were excludede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at various light intensities in leaves of tomato ( Solanum lycopersicum )”
e2“This relationship was strongest at low leaf-to-air vapour pressure deficits (0.5-1.0 kilopascal), and when dark-adapted leaves were excluded”
Claim · model-written summary
The t50 relationship at 400 µmol mol −1 CO2 had R2 = 0.86 in tomato leaves.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- CO 2 mole fractionse3
- Outcome
- relationshipe3
- Value
- 0.86e3
- Qualifier
- 400e3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at various light intensities in leaves of tomato ( Solanum lycopersicum )”
e3“This relationship was documented at different CO 2 mole fractions, namely 400 (R 2 = 0.86)”
Claim · model-written summary
The t50 relationship at 600 µmol mol −1 CO2 had R2 = 0.66 in tomato leaves.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- CO 2 mole fractionse3
- Outcome
- relationshipe3
- Value
- 0.66e4
- Qualifier
- 600e4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at various light intensities in leaves of tomato ( Solanum lycopersicum )”
e3“This relationship was documented at different CO 2 mole fractions, namely 400 (R 2 = 0.86)”
e4“600 (R 2 = 0.66) and 800 µmol mol − 1 (R 2 = 0.92)”
Claim · model-written summary
The t50 relationship at 800 µmol mol −1 CO2 had R2 = 0.92 in tomato leaves.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- CO 2 mole fractionse3
- Outcome
- relationshipe3
- Value
- 0.92e4
- Qualifier
- 800 µmol mol − 1e4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at various light intensities in leaves of tomato ( Solanum lycopersicum )”
e3“This relationship was documented at different CO 2 mole fractions, namely 400 (R 2 = 0.86)”
e4“600 (R 2 = 0.66) and 800 µmol mol − 1 (R 2 = 0.92)”
Claim · model-written summary
A survey of the literature suggests that the t50 relationship also exists in other tree and herbaceous species.
Verbatim
e5“A survey of the literature suggested that this relationship also exists in various other tree and herbaceous species”
Claim · model-written summary
The t50 relationship is a useful proxy for the rate of photosynthetic induction between any two light intensities, using conventional steady-state light response curves.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- proxy for the rate of photosynthetic inductione6
- Comparator
- conventional steady-state photosynthesis light response curvese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at various light intensities in leaves of tomato ( Solanum lycopersicum )”
e6“particularly useful as proxy for the rate of photosynthetic induction between any two light intensities, through the use of conventional steady-state photosynthesis light response curves”
Claim · model-written summary
The authors provide a guide for best practice for characterizing the t50 relationship in tomato leaves.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- guide for best practicee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at various light intensities in leaves of tomato ( Solanum lycopersicum )”
e7“A guide for best practice for characterizing the t 50 - Δ A relationship in the leaves of interest is provided”