Abstract
The effects of chilling on the photosynthesis of a chilling-resistant species, pea (Pisum sativum L. cv Alaska) and a chilling-sensitive species, cucumber (Cucumis sativus L. cv Ashley) were compared in order to determine the differences in the photosynthetic chilling sensitivity of these two species. For these experiments, plants were chilled (5 degrees C) for different lengths of time in the dark or light. Following a 1 hour recovery period at 25 degrees C, photosynthetic activity was measured by gas exchange (CO(2) uptake and H(2)O release), quantum yield, and induced chlorophyll fluorescence. The results show that pea photosynthesis was largely unaffected by two consecutive nights of chilling in the dark, or by chilling during a complete light and dark cycle (15 hours/9 hours). Cucumber gas exchange was reduced by one night of chilling, but its quantum yield and variable fluorescence were unaffected by dark chilling. However, chilling cucumber in the light led to reduced CO(2) fixation, increased internal leaf CO(2) concentration, decreased quantum yield, and loss of variable fluorescence. These results indicate that chilling temperatures in conjunction with light damaged the light reactions of photosynthesis, while chilling in the dark did not.
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Claims 10
Claim · model-written summary
Pea photosynthesis was largely unaffected by two dark chilling nights or a full light-dark chilling cycle.
- Taxon
- pea
Lathyrus oleraceuse0 - Treatment
- two consecutive nights of chilling in the darke0
- Outcome
- photosynthesise0
- Direction
- largely unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pea photosynthesis was largely unaffected by two consecutive nights of chilling in the dark, or by chilling during a complete light and dark cycle (15 hours/9 hours)”
Claim · model-written summary
Pea photosynthesis was largely unaffected by a complete light-dark chilling cycle.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- chilling during a complete light and dark cycle (15 hours/9 hours)e0
- Outcome
- photosynthesise0
- Direction
- largely unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pea photosynthesis was largely unaffected by two consecutive nights of chilling in the dark, or by chilling during a complete light and dark cycle (15 hours/9 hours)”
Claim · model-written summary
One night of chilling reduced cucumber gas exchange.
- Taxon
- Cucumber
Cucumis sativuse0 - Treatment
- one night of chillinge0
- Outcome
- gas exchangee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cucumber gas exchange was reduced by one night of chilling”
Claim · model-written summary
Dark chilling did not affect cucumber quantum yield.
- Taxon
- cucumberCucumis sativust0
- Treatment
- dark chillinge0
- Outcome
- quantum yielde0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“quantum yield and variable fluorescence were unaffected by dark chilling”
t0“Cucumber”
Claim · model-written summary
Dark chilling did not affect cucumber variable fluorescence.
- Taxon
- cucumberCucumis sativust0
- Treatment
- dark chillinge0
- Outcome
- variable fluorescencee0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“quantum yield and variable fluorescence were unaffected by dark chilling”
t0“Cucumber”
Claim · model-written summary
Chilling cucumber in light reduced CO(2) fixation.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- chilling cucumber in the lighte0
- Outcome
- CO(2) fixatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chilling cucumber in the light led to reduced CO(2) fixation”
Claim · model-written summary
Chilling cucumber in light increased internal leaf CO(2).
- Taxon
- cucumberCucumis sativuse0
- Treatment
- chilling cucumber in the lighte0
- Outcome
- internal leaf CO(2) concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chilling cucumber in the light led to reduced CO(2) fixation, increased internal leaf CO(2) concentration”
Claim · model-written summary
Chilling cucumber in light decreased quantum yield.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- chilling cucumber in the lighte0
- Outcome
- quantum yielde0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chilling cucumber in the light led to reduced CO(2) fixation, increased internal leaf CO(2) concentration, decreased quantum yield”
Claim · model-written summary
Chilling cucumber in light caused loss of variable fluorescence.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- chilling cucumber in the lighte0
- Outcome
- variable fluorescencee0
- Direction
- losse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chilling cucumber in the light led to reduced CO(2) fixation, increased internal leaf CO(2) concentration, decreased quantum yield, and loss of variable fluorescence”
Claim · model-written summary
The authors infer that light plus chilling damaged photosynthetic light reactions.
- Taxon
- cucumberCucumis sativust0
- Treatment
- chilling temperatures in conjunction with lighte0
- Outcome
- light reactions of photosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chilling temperatures in conjunction with light damaged the light reactions of photosynthesis”
t0“Cucumber”
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See all 6 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.