Abstract
Leaf anatomy and irradiance-dependent leaf transmittance changes serving as irradiance acclimation mechanisms in leaves were studied in two ecologically contrasting Tradescantia species, a shade plant T. fluminensis Vell. and a sun plant T. sillamontana Matuda, grown at different irradiances. A dramatic increase in leaf thickness (2 to 4-fold) under a high growth irradiance (800 μmol m-2 s-1) compared with a low growth irradiance (60 μmol m-2 s-1), achieved mainly by expansion of the epidermis, was recorded in both species. The effect took place on the background of modest changes in mesophyll thickness (1.8-fold in T. fluminensis and 1.15-fold in T. sillamontana) and chloroplast size (0.8-fold in T. fluminensis and an insignificant change in T. sillamontana). Mesophyll structure and growth irradiance response did not seem to facilitate significantly light-dependent chloroplast (avoidance) movement in these species. Nevertheless, an exceptionally large (2 to 4-fold) irradiance-induced increase in light transmittance attributable to chloroplast avoidance movement was revealed. This increase by far exceeded that in other higher plants according to available literature. The magnitude of the irradiance-dependent transmittance changes positively correlated both with the rate of photosystem II recovery and with the extent of xanthophyll deepoxidation in the leaves. This was opposite to a negative correlation observed between the same parameters in different plant species. We hypothesize that, at the evolutionary timescale, chloroplast avoidance movement might adjust independently from other photoprotective mechanisms, e.g., non-photochemical quenching, whereas, on the ontogenetic timescale, adjustment of these mechanisms inevitably follows the same trend.
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Claims 11
Claim · model-written summary
High irradiance increased leaf thickness two to fourfold.
- Taxon
- Tradescantia species
Tradescantiat0 - Treatment
- high growth irradiance (800 μmol m-2 s-1)e0
- Outcome
- leaf thicknesse0
- Direction
- increasee0
- Value
- 2 to 4-folde0
- Comparator
- low growth irradiance (60 μmol m-2 s-1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia species”
e0“A dramatic increase in leaf thickness (2 to 4-fold) under a high growth irradiance (800 μmol m-2 s-1) compared with a low growth irradiance (60 μmol m-2 s-1), achieved mainly by expansion of the epidermis, was recorded in both species.”
Claim · model-written summary
Mesophyll thickness changed 1.8-fold in T. fluminensis.
- Taxon
- Tradescantia speciesTradescantiat0
- Outcome
- mesophyll thicknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia species”
e0“mesophyll thickness (1.8-fold in T. fluminensis and 1.15-fold in T. sillamontana)”
Claim · model-written summary
Mesophyll thickness changed 1.15-fold in T. sillamontana.
- Taxon
- Tradescantia speciesTradescantiat0
- Outcome
- mesophyll thicknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia species”
e0“mesophyll thickness (1.8-fold in T. fluminensis and 1.15-fold in T. sillamontana)”
Claim · model-written summary
Chloroplast size changed 0.8-fold in T. fluminensis.
- Taxon
- Tradescantia speciesTradescantiat0
- Outcome
- chloroplast sizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia species”
e0“chloroplast size (0.8-fold in T. fluminensis and an insignificant change in T. sillamontana)”
Claim · model-written summary
Chloroplast size did not change significantly in T. sillamontana.
- Taxon
- Tradescantia speciesTradescantiat0
- Outcome
- chloroplast sizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia species”
e0“chloroplast size (0.8-fold in T. fluminensis and an insignificant change in T. sillamontana)”
Claim · model-written summary
Mesophyll structure did not significantly facilitate chloroplast avoidance movement.
- Taxon
- Tradescantia speciesTradescantiat0
- Outcome
- chloroplast (avoidance) movemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia species”
e0“Mesophyll structure and growth irradiance response did not seem to facilitate significantly light-dependent chloroplast (avoidance) movement in these species.”
Claim · model-written summary
Irradiance increased light transmittance two to fourfold.
- Taxon
- Tradescantia speciesTradescantiat0
- Outcome
- light transmittancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia species”
e0“an exceptionally large (2 to 4-fold) irradiance-induced increase in light transmittance attributable to chloroplast avoidance movement was revealed.”
Claim · model-written summary
The transmittance increase exceeded that of other higher plants.
- Taxon
- Tradescantia speciesTradescantiat0
- Outcome
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia species”
e0“This increase by far exceeded that in other higher plants according to available literature.”
Claim · model-written summary
Transmittance changes positively correlated with photosystem II recovery.
- Taxon
- Tradescantia speciesTradescantiat0
- Outcome
- rate of photosystem II recoverye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia species”
e0“The magnitude of the irradiance-dependent transmittance changes positively correlated both with the rate of photosystem II recovery and with the extent of xanthophyll deepoxidation in the leaves.”
Claim · model-written summary
Transmittance changes positively correlated with xanthophyll deepoxidation.
- Taxon
- Tradescantia speciesTradescantiat0
- Outcome
- extent of xanthophyll deepoxidatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia species”
e0“The magnitude of the irradiance-dependent transmittance changes positively correlated both with the rate of photosystem II recovery and with the extent of xanthophyll deepoxidation in the leaves.”
Claim · model-written summary
The correlation opposed the negative cross-species correlation.
- Taxon
- Tradescantia speciesTradescantiat0
- Outcome
- negative correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia species”
e0“This was opposite to a negative correlation observed between the same parameters in different plant species.”
The same questions in other papers
light · growth · Tradescantia (spiderworts)Results agree
1 paper in the same direction as this paper
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.