Abstract
Leaf discs of Capsicum annuum L. were illuminated in air enriched with 1% CO 2 in the absence or presence of lincomycin, an inhibitor of chloroplast‐encoded protein synthesis. The loss of functional photosystem (PS) II complexes with increase in cumulative light dose (photon exposure), assessed by the O 2 yield per single‐turnover flash, was greater in leaves of plants grown in low light than those in high light; it was also exacerbated in the presence of lincomycin. A single exponential decay can describe the relationship between the loss of functional PSII and increase in cumulative photon exposure. From this relationship we obtained both the maximum quantum yield of photoinactivation of PSII at limiting photon exposures and the coefficient k, interpreted as the probability of photoinactivation of PSII per unit photon exposure. Parallel measurements of chlorophyll fluorescence after light treatment showed that 1/F o −1/F m was linearly correlated with the functionality of PSII, where F o and F m are the chlorophyll fluorescence yields corresponding to open and closed PSII reaction centers, respectively. Using 1/F o −1/F m as a convenient indicator of PSII functionality, it was found that PSII is present in excess; only after the loss of about 40% functional PSII complexes did PSII begin to limit photosynthetic capacity in capsicum leaves.
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Claims 5
Claim · model-written summary
Low-light-grown leaves lost functional PSII faster with increasing light dose than high-light-grown leaves.
- Taxon
- Capsicum annuum
Capsicum annuumt0 - Treatment
- low lighte0
- Outcome
- loss of functional photosystem (PS) II complexese0
- Direction
- greatere0
- Comparator
- high lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The loss of functional photosystem (PS) II complexes with increase in cumulative light dose (photon exposure), assessed by the O 2 yield per single‐turnover flash, was greater in leaves of plants grown in low light than those in high light”
t0“Capsicum annuum”
Claim · model-written summary
Lincomycin exacerbated the loss of functional PSII.
- Taxon
- Capsicum annuumCapsicum annuumt0
- Treatment
- lincomycine0
- Outcome
- loss of functional PSIIe1
- Direction
- exacerbatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it was also exacerbated in the presence of lincomycin”
t0“Capsicum annuum”
e1“the loss of functional PSII”
Claim · model-written summary
Functional PSII loss followed a single exponential relationship with cumulative photon exposure.
- Taxon
- Capsicum annuumCapsicum annuumt0
- Treatment
- cumulative photon exposuree0
- Outcome
- loss of functional PSIIe0
- Direction
- decaye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single exponential decay can describe the relationship between the loss of functional PSII and increase in cumulative photon exposure”
t0“Capsicum annuum”
Claim · model-written summary
Chlorophyll fluorescence 1/F o −1/F m correlated linearly with PSII functionality.
- Taxon
- Capsicum annuumCapsicum annuumt0
- Outcome
- functionality of PSIIe0
- Comparator
- 1/F o −1/F me0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1/F o −1/F m was linearly correlated with the functionality of PSII”
t0“Capsicum annuum”
Claim · model-written summary
Photosynthetic capacity became PSII-limited after about 40% of functional PSII complexes were lost.
- Outcome
- photosynthetic capacitye0
- Value
- about 40%e0
- Qualifier
- loss of about 40% functional PSII complexese0
CapsicumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only after the loss of about 40% functional PSII complexes did PSII begin to limit photosynthetic capacity in capsicum leaves”
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See all 7 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.