Abstract
We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves. Exposure of plants growing outdoors to successive chilling nights caused light- and CO(2)-saturated photosynthetic O(2) evolution to decline to zero within 5 d. Plants recovered after four warm nights. These photosynthetic responses were confirmed in potted plants, even when roots were heated. The inhibitory effects of chilling were greater after a period of illumination, probably because transpiration induced higher water deficit. Stomatal closure only accounted for part of the inhibition of photosynthesis. Fluorescence measurements showed no evidence of photoinhibition, but nonphotochemical quenching increased in stressed plants. The most characteristic response to both stresses was an increase in the ratio of electron transport to net O(2) evolution, even at high external CO(2) concentrations. Oxygen isotope exchange revealed that this imbalance was due to increased O(2) uptake, which probably has two components: photorespiration and the Mehler reaction. Chilling- and drought-induced water stress enhanced both O(2) uptake processes, and both processes maintained relatively high rates of electron flow as CO(2) exchange approached zero in stressed leaves. Presumably, high electron transport associated with O(2) uptake processes also maintained a high DeltapH, thus affording photoprotection.
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Claims 14
Claim · model-written summary
Low night temperatures and slowly imposed water stress had similar effects on photosynthesis in grapevine leaves.
- Treatment
- low night temperatures (5 degrees C-10 degrees C)e1
- Outcome
- photosynthesise1
- Comparator
- slowly imposed water stresse1
VitisNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
Claim · model-written summary
Successive chilling nights outdoors reduced light- and CO2-saturated photosynthetic O2 evolution of grapevine to zero within 5 days.
- Treatment
- successive chilling nightse2
- Outcome
- light- and CO(2)-saturated photosynthetic O(2) evolutione2
- Direction
- declinee2
- Value
- within 5 de2
- Setting
- outdoorse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e2“Exposure of plants growing outdoors to successive chilling nights caused light- and CO(2)-saturated photosynthetic O(2) evolution to decline to zero within 5 d”
Claim · model-written summary
Grapevine plants recovered after four warm nights following chilling.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e3“Plants recovered after four warm nights”
Claim · model-written summary
Photosynthetic responses to chilling were confirmed in potted grapevine plants, including when roots were heated.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e4“These photosynthetic responses were confirmed in potted plants, even when roots were heated”
Claim · model-written summary
The inhibitory effects of chilling on grapevine photosynthesis were greater after a period of illumination.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e5“The inhibitory effects of chilling were greater after a period of illumination, probably because transpiration induced higher water deficit”
Claim · model-written summary
The greater inhibition after illumination is probably because transpiration induced a higher water deficit.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e5“The inhibitory effects of chilling were greater after a period of illumination, probably because transpiration induced higher water deficit”
Claim · model-written summary
Stomatal closure accounted for only part of the inhibition of grapevine photosynthesis.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e6“Stomatal closure only accounted for part of the inhibition of photosynthesis”
Claim · model-written summary
Fluorescence measurements showed no evidence of photoinhibition in grapevine leaves.
- Outcome
- evidence of photoinhibitione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e7“Fluorescence measurements showed no evidence of photoinhibition, but nonphotochemical quenching increased in stressed plants”
Claim · model-written summary
Nonphotochemical quenching increased in stressed grapevine plants.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e7“Fluorescence measurements showed no evidence of photoinhibition, but nonphotochemical quenching increased in stressed plants”
Claim · model-written summary
Both stresses increased the ratio of electron transport to net O2 evolution in grapevine, even at high external CO2 concentrations.
- Treatment
- both stressese2
- Outcome
- ratio of electron transport to net O(2) evolutione2
- Direction
- increasee2
- Qualifier
- even at high external CO(2) concentrationse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e2“The most characteristic response to both stresses was an increase in the ratio of electron transport to net O(2) evolution, even at high external CO(2) concentrations”
Claim · model-written summary
The imbalance between electron transport and net O2 evolution was probably due to increased O2 uptake, with photorespiration and the Mehler reaction as its two components.
- Outcome
- imbalancee2
- Qualifier
- increased O(2) uptake, which probably has two components: photorespiration and the Mehler reactione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e2“Oxygen isotope exchange revealed that this imbalance was due to increased O(2) uptake, which probably has two components: photorespiration and the Mehler reaction”
Claim · model-written summary
Chilling- and drought-induced water stress enhanced both O2 uptake processes in grapevine leaves.
- Treatment
- Chilling- and drought-induced water stresse2
- Outcome
- O(2) uptake processese2
- Direction
- enhancede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e2“Chilling- and drought-induced water stress enhanced both O(2) uptake processes”
Claim · model-written summary
Both O2 uptake processes maintained relatively high rates of electron flow as CO2 exchange approached zero in stressed grapevine leaves.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e2“both processes maintained relatively high rates of electron flow as CO(2) exchange approached zero in stressed leaves”
Claim · model-written summary
High electron transport associated with O2 uptake presumably maintained a high DeltapH, thus affording photoprotection in grapevine.
- Outcome
- photoprotectione2
- Qualifier
- high electron transport associated with O(2) uptake processes also maintained a high DeltapHe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We found similarities between the effects of low night temperatures (5 degrees C-10 degrees C) and slowly imposed water stress on photosynthesis in grapevine (Vitis vinifera L.) leaves”
e2“Presumably, high electron transport associated with O(2) uptake processes also maintained a high DeltapH, thus affording photoprotection”
The same questions in other papers
cold · physiology: photosynthesis · VitisPositive and negative results
4 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
3 papers more in this group
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.