Abstract
Low light stress is one of the main limiting factors which influence the production of sweet pepper under protected cultivation in China. In this experiment, two genotypes of sweet pepper, ShY (low light-tolerant genotype) and 20078 (low light-sensitive genotype), were used to study the effects of low light (photosynthetic photon flux density, PPFD was 75–100 μmol m−2 s−1, control 450–500 μmol m−2 s−1) on photosynthesis during leaf development. The result indicated that under low light chlorophyll content, net photosynthetic rate (PN), photosynthetic apparent quantum efficiency (Φi) and carboxylation efficiency (CE) of sweet pepper leaves increased gradually and decreased after reaching the maximum levels. The time to reach the peak values for all the above parameters was delayed, whereas the light compensation point (LCP) decreased gradually along with leaf expansion. The decrease in maximum quantum yield of PS II (Fv/Fm) was not observed at any stages of the leaf development under low light condition, but the actual PS II efficiency under irradiance (ΦPS II) was lower accompanied by an increased non-photochemical quenching (NPQ) in young and/or old leaves compared with mature leaves. The antenna thermal dissipation (D) was a main way of heat dissipation when young leaves received excessive light energy, while the decline in photosynthetic function in senescence leaf was mostly owing to the decrease in carbon assimilation capacity, followed by a significantly increased allocation of excessive energy (Ex). Compared with 20078, ShY could maintain higher PN, ΦPS II and lower QA reduction state for a longer time during leaf development. Thus, in ShY photosynthetic efficiency and the activity of electron transport of PS II were not significantly affected due to low light stress.
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Claims 13
Claim · model-written summary
Under low light, chlorophyll content, net photosynthetic rate and apparent quantum efficiency rose then declined during leaf development.
- Taxon
- sweet pepper
Capsicum annuume0 - Treatment
- low lighte0
- Outcome
- chlorophyll content, net photosynthetic rate (PN), photosynthetic apparent quantum efficiency (Φi)e0
- Direction
- increased gradually and decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under low light chlorophyll content, net photosynthetic rate (PN), photosynthetic apparent quantum efficiency (Φi) and carboxylation efficiency (CE) of sweet pepper leaves increased gradually and decreased after reaching the maximum levels”
Claim · model-written summary
Under low light, carboxylation efficiency rose then declined during leaf development.
- Taxon
- sweet pepperCapsicum annuume0
- Treatment
- low lighte0
- Outcome
- carboxylation efficiency (CE)e0
- Direction
- increased gradually and decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under low light chlorophyll content, net photosynthetic rate (PN), photosynthetic apparent quantum efficiency (Φi) and carboxylation efficiency (CE) of sweet pepper leaves increased gradually and decreased after reaching the maximum levels”
Claim · model-written summary
Low light delayed peak values of the photosynthetic parameters.
- Taxon
- sweet pepperCapsicum annuumt0
- Treatment
- Low Lighte2
- Outcome
- time to reach the peak valuese0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The time to reach the peak values for all the above parameters was delayed”
e2“under low light chlorophyll content”
t0“Sweet Pepper”
t1“Sweet Pepper”
Claim · model-written summary
Light compensation point decreased as leaves expanded.
- Taxon
- sweet pepperCapsicum annuumt0
- Organ / stage
- leaf expansione0
- Outcome
- light compensation point (LCP)e0
- Direction
- decreased graduallye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the light compensation point (LCP) decreased gradually along with leaf expansion”
t0“Sweet Pepper”
t1“Sweet Pepper”
Claim · model-written summary
Low light did not decrease maximum PS II quantum yield at any leaf stage.
- Taxon
- sweet pepperCapsicum annuumt0
- Treatment
- low light conditione0
- Outcome
- maximum quantum yield of PS II (Fv/Fm)e0
- Direction
- not observede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in maximum quantum yield of PS II (Fv/Fm) was not observed at any stages of the leaf development under low light condition”
t0“Sweet Pepper”
t1“Sweet Pepper”
Claim · model-written summary
Young or old leaves had lower actual PS II efficiency than mature leaves.
- Taxon
- sweet pepperCapsicum annuumt0
- Organ / stage
- young and/or old leavese0
- Outcome
- actual PS II efficiency under irradiance (ΦPS II)e0
- Direction
- lowere0
- Comparator
- mature leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the actual PS II efficiency under irradiance (ΦPS II) was lower accompanied by an increased non-photochemical quenching (NPQ) in young and/or old leaves compared with mature leaves”
t0“Sweet Pepper”
t1“Sweet Pepper”
Claim · model-written summary
Young or old leaves had higher non-photochemical quenching than mature leaves.
- Taxon
- sweet pepperCapsicum annuumt0
- Organ / stage
- young and/or old leavese0
- Outcome
- non-photochemical quenching (NPQ)e0
- Direction
- increasede0
- Comparator
- mature leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the actual PS II efficiency under irradiance (ΦPS II) was lower accompanied by an increased non-photochemical quenching (NPQ) in young and/or old leaves compared with mature leaves”
t0“Sweet Pepper”
t1“Sweet Pepper”
Claim · model-written summary
Antenna thermal dissipation was the main heat-dissipation pathway in young leaves under excess light.
- Taxon
- sweet pepperCapsicum annuumt0
- Organ / stage
- young leavese0
- Outcome
- heat dissipatione0
- Qualifier
- antenna thermal dissipation (D)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The antenna thermal dissipation (D) was a main way of heat dissipation when young leaves received excessive light energy”
t0“Sweet Pepper”
t1“Sweet Pepper”
Claim · model-written summary
Reduced carbon assimilation capacity largely explained photosynthetic decline in senescent leaves.
- Taxon
- sweet pepperCapsicum annuumt0
- Organ / stage
- senescence leafe0
- Outcome
- decline in photosynthetic functione0
- Qualifier
- decrease in carbon assimilation capacitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decline in photosynthetic function in senescence leaf was mostly owing to the decrease in carbon assimilation capacity”
t0“Sweet Pepper”
t1“Sweet Pepper”
Claim · model-written summary
Senescent leaves allocated significantly more excessive energy.
- Taxon
- sweet pepperCapsicum annuumt0
- Outcome
- allocation of excessive energy (Ex)e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significantly increased allocation of excessive energy (Ex)”
t0“Sweet Pepper”
t1“Sweet Pepper”
Claim · model-written summary
ShY maintained higher photosynthetic rate and PS II efficiency than 20078 for longer.
- Taxon
- sweet pepperCapsicum annuumt0
- Material
- ShYe0
- Outcome
- PN, ΦPS IIe0
- Direction
- highere0
- Comparator
- 20078e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with 20078, ShY could maintain higher PN, ΦPS II and lower QA reduction state for a longer time during leaf development”
t0“Sweet Pepper”
t1“Sweet Pepper”
Claim · model-written summary
ShY maintained a lower QA reduction state than 20078 for longer.
- Taxon
- sweet pepperCapsicum annuumt0
- Material
- ShYe0
- Outcome
- QA reduction statee0
- Direction
- lowere0
- Comparator
- 20078e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with 20078, ShY could maintain higher PN, ΦPS II and lower QA reduction state for a longer time during leaf development”
t0“Sweet Pepper”
t1“Sweet Pepper”
Claim · model-written summary
Low light did not significantly affect ShY photosynthetic efficiency or PS II electron transport.
- Taxon
- sweet pepperCapsicum annuumt0
- Material
- ShYe0
- Treatment
- low light stresse0
- Outcome
- photosynthetic efficiency and the activity of electron transport of PS IIe0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in ShY photosynthetic efficiency and the activity of electron transport of PS II were not significantly affected due to low light stress”
t0“Sweet Pepper”
t1“Sweet Pepper”
The same questions in other papers
light · physiology: photosynthesis · Capsicum annuum (sweet pepper)Positive and negative results
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