Abstract
The extent and time course of changes in photosynthetic activities of leaves and isolated chloroplasts was followed in pea plants which were adapted to low light (60 µmol photons m-2 s-1, 400-700 nm, 16 h light/ 8 h dark cycles), and subsequently transferred to higher light (390 µmol photons m-2 s-1). The photosynthetic rates of leaves in CO2-saturating conditions, measured at light saturation or subsaturation, increased with no noticeable lag, doubling within 1 week after transfer to high light. In contrast, the increase of in vitro ribulose-1,5-bisphosphate carboxylase activity (~ 130%) and photosystem II electron transport capacity (~ 60%) occurred with an apparent lag of - 1 day after transfer to high light. The capacity for uncoupled whole-chain electron transport also increased slowly (~ 70%). Whilst the total chlorophyll (Chl) per unit leaf area remained steady, the Chl a/Chl b ratio increased with no apparent lag phase from 2.7 in low irradiance to 3.2 in high irradiance within 1 week. The results demonstrate that, following an increase of growth irradiance, pea leaves readily increase the capacity for utilising high light effectively, even when the total chlorophyll per unit leaf area remained constant. However, a better understanding of the time course of response requires measurements of other chloroplast parameters.
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Claims 7
Claim · model-written summary
Leaf photosynthetic rates doubled within a week of transfer to higher light without noticeable lag.
- Taxon
- Pisum sativum
Lathyrus oleraceust0 - Organ / stage
- leavese0
- Treatment
- high lighte0
- Outcome
- photosynthetic rates of leavese0
- Direction
- increasede0
- Value
- doubling within 1 weeke0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e0“The photosynthetic rates of leaves in CO2-saturating conditions, measured at light saturation or subsaturation, increased with no noticeable lag, doubling within 1 week after transfer to high light”
Claim · model-written summary
In vitro ribulose-1,5-bisphosphate carboxylase activity increased about 130% after an apparent one-day lag.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- high lighte0
- Gene
- ribulose-1,5-bisphosphate carboxylasee0
- Outcome
- ribulose-1,5-bisphosphate carboxylase activitye0
- Direction
- increasee0
- Value
- ~ 130%e0
- Qualifier
- apparent lag of - 1 daye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e0“the increase of in vitro ribulose-1,5-bisphosphate carboxylase activity (~ 130%) and photosystem II electron transport capacity (~ 60%) occurred with an apparent lag of - 1 day after transfer to high light”
Claim · model-written summary
Photosystem II electron transport capacity increased about 60% after an apparent one-day lag.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- high lighte0
- Outcome
- photosystem II electron transport capacitye0
- Direction
- increasee0
- Value
- ~ 60%e0
- Qualifier
- apparent lag of - 1 daye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e0“the increase of in vitro ribulose-1,5-bisphosphate carboxylase activity (~ 130%) and photosystem II electron transport capacity (~ 60%) occurred with an apparent lag of - 1 day after transfer to high light”
Claim · model-written summary
Uncoupled whole-chain electron transport capacity increased slowly by about 70%.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- capacity for uncoupled whole-chain electron transporte0
- Direction
- increasede0
- Value
- ~ 70%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e0“The capacity for uncoupled whole-chain electron transport also increased slowly (~ 70%)”
Claim · model-written summary
Total chlorophyll per unit leaf area remained steady after the irradiance increase.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- total chlorophyll (Chl) per unit leaf areae0
- Direction
- remained steadye0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e0“the total chlorophyll (Chl) per unit leaf area remained steady”
Claim · model-written summary
The chlorophyll a/b ratio rose from 2.7 at low irradiance to 3.2 at high irradiance within one week without an apparent lag.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- high irradiancee0
- Outcome
- Chl a/Chl b ratioe0
- Direction
- increasede0
- Value
- 2.7 in low irradiance to 3.2 in high irradiancee0
- Qualifier
- within 1 weeke0
- Comparator
- low irradiancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e0“the Chl a/Chl b ratio increased with no apparent lag phase from 2.7 in low irradiance to 3.2 in high irradiance within 1 week”
Claim · model-written summary
The authors concluded that pea leaves rapidly increase their ability to use high light effectively after growth irradiance rises.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- capacity for utilising high light effectivelye0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pisum sativum”
e0“pea leaves readily increase the capacity for utilising high light effectively”
The same questions in other papers
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See all 24 papers →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.