Abstract
The photosynthetic acclimation of Tradescantia albiflora (Kunth), a trailing ground species naturally occurring in the deep shade of rainforests, was studied in relation to growth irradiance (glasshouse; direct light and 1 to 4 layers of shade cloth, giving 100 to 1.4% relative growth irradiance). Contrary to other irradiance studies of higher plants grown in natural habitats or controlled light environments, the chlorophyll a/b ratios of Tradescantia leaves were low (∼2.2) and constant. Acclimation to growth irradiance caused no changes in the relative amounts of specific Chl‐proteins or the numbers of photosystem I (PSI) and PSII reaction centres on a chlorophyll basis, indicating that the light‐harvesting antenna sizes of PSII and PSI, as well as the photosystem stoichiometry, were independent of growth irradiance. However, the amount of cytochrome f and ATP synthase on a chlorophyll basis increased with increasing the relative growth irradiance from 1.4 to 35%, showing acclimation of electron transport and photophosphorylation capacity. The photosynthetic capacity and ribulose 1, 5‐bisphosphate carboxylase (EC 4.1.1.39) activity also increased with increase of the growth irradiance to 35%. Beyond that, the inflexible PSII/PSI stoichiometry and shade‐type photosystem II/light‐harvesting units in Tradescaniia are a disadvantage for long‐term exposure to high irradiance since the leaves are more prone to photoinhibition.
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Claims 8
Claim · model-written summary
Chlorophyll a/b ratios of Tradescantia leaves were low, about 2.2, and constant across growth irradiances.
- Taxon
- Tradescantia
Tradescantiat0 - Outcome
- chlorophyll a/b ratiose1
- Value
- ∼2.2e1
- Qualifier
- and constante1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia albiflora”
e1“the chlorophyll a/b ratios of Tradescantia leaves were low (∼2.2) and constant”
Claim · model-written summary
Acclimation to growth irradiance did not change the relative amounts of specific Chl-proteins.
- Taxon
- TradescantiaTradescantiat0
- Treatment
- growth irradiancee2
- Outcome
- relative amounts of specific Chl‐proteinse2
- Direction
- no changese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia albiflora”
e2“Acclimation to growth irradiance caused no changes in the relative amounts of specific Chl‐proteins or the numbers of photosystem I (PSI) and PSII reaction centres on a chlorophyll basis”
Claim · model-written summary
Acclimation to growth irradiance did not change the numbers of photosystem I and PSII reaction centres on a chlorophyll basis.
- Taxon
- TradescantiaTradescantiat0
- Treatment
- growth irradiancee2
- Outcome
- numbers of photosystem I (PSI) and PSII reaction centrese2
- Direction
- no changese2
- Qualifier
- on a chlorophyll basise2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia albiflora”
e2“Acclimation to growth irradiance caused no changes in the relative amounts of specific Chl‐proteins or the numbers of photosystem I (PSI) and PSII reaction centres on a chlorophyll basis”
Claim · model-written summary
Light-harvesting antenna sizes of PSII and PSI and photosystem stoichiometry are independent of growth irradiance.
- Taxon
- TradescantiaTradescantiat0
- Outcome
- light‐harvesting antenna sizes of PSII and PSIe3
- Qualifier
- independent of growth irradiancee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia albiflora”
e3“indicating that the light‐harvesting antenna sizes of PSII and PSI, as well as the photosystem stoichiometry, were independent of growth irradiance”
Claim · model-written summary
Amounts of cytochrome f and ATP synthase on a chlorophyll basis increased with growth irradiance from 1.4 to 35%.
- Taxon
- TradescantiaTradescantiat0
- Treatment
- relative growth irradiancee4
- Outcome
- amount of cytochrome f and ATP synthasee4
- Direction
- increasede4
- Value
- from 1.4 to 35%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia albiflora”
e4“the amount of cytochrome f and ATP synthase on a chlorophyll basis increased with increasing the relative growth irradiance from 1.4 to 35%”
Claim · model-written summary
Photosynthetic capacity increased with growth irradiance up to 35%.
- Taxon
- TradescantiaTradescantiat0
- Treatment
- growth irradiancee5
- Outcome
- photosynthetic capacitye5
- Direction
- increasede5
- Value
- to 35%e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia albiflora”
e5“The photosynthetic capacity and ribulose 1, 5‐bisphosphate carboxylase (EC 4.1.1.39) activity also increased with increase of the growth irradiance to 35%”
Claim · model-written summary
Ribulose 1, 5-bisphosphate carboxylase activity increased with growth irradiance up to 35%.
- Taxon
- TradescantiaTradescantiat0
- Treatment
- growth irradiancee5
- Outcome
- ribulose 1, 5‐bisphosphate carboxylase (EC 4.1.1.39) activitye5
- Direction
- increasede5
- Value
- to 35%e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia albiflora”
e5“The photosynthetic capacity and ribulose 1, 5‐bisphosphate carboxylase (EC 4.1.1.39) activity also increased with increase of the growth irradiance to 35%”
Claim · model-written summary
The inflexible PSII/PSI stoichiometry and shade-type PSII units are a disadvantage under long-term exposure to high irradiance because leaves are more prone to photoinhibition.
- Taxon
- TradescantiaTradescantiat0
- Treatment
- long‐term exposure to high irradiancee6
- Outcome
- prone to photoinhibitione6
- Qualifier
- inflexible PSII/PSI stoichiometrye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia albiflora”
e6“the inflexible PSII/PSI stoichiometry and shade‐type photosystem II/light‐harvesting units in Tradescaniia are a disadvantage for long‐term exposure to high irradiance since the leaves are more prone to photoinhibition”
The same questions in other papers
light · physiology: photosynthesis · Tradescantia (spiderworts)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- 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.