Abstract
Summary In long‐term field experiments, during consecutive years, microswards of subterranean clover were irrigated to minimise water deficits or subjected to progressively increasing drought over 30 days. Both leaf water potential and relative water content steadily decreased during the experiments. Plants affected by drought grew more slowly and photosynthesis was decreased. Photosynthetic rate (A) and Rubisco were analysed in relation to midday water potentials and relative water contents. The difference in A between draughted and irrigated plants increased progressively, in part as a result of decreased stomatal conductance and CO 2 concentration within leaf (Ci). However, A‐Ci curves suggest that the photosynthetic capacity in plants experiencing long‐term stress was reduced by 50% when compared with irrigated plants. Drought decreased both the initial and the total Rubisco activity per unit area in a similar way but did not reduce the amount of Rubisco protein per unit leaf area. Thus, the specific activity of Rubisco, rather than its activation state, decreased suggesting that under water stress the active sites were blocked by inhibitors.
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Claims 7
Claim · model-written summary
Leaf water potential and relative water content decreased during the drought experiments.
Not reportedTaxon
Verbatim
e0“Both leaf water potential and relative water content steadily decreased during the experiments.”
Claim · model-written summary
Drought affected plants grew more slowly and had decreased photosynthesis.
- Taxon
- PlantsViridiplantaee0
- Treatment
- droughte0
- Outcome
- grew more slowly and photosynthesise0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“Plants affected by drought grew more slowly and photosynthesis was decreased.”
Claim · model-written summary
The photosynthetic difference between droughted and irrigated plants progressively increased.
Verbatim
e0“The difference in A between draughted and irrigated plants increased progressively, in part as a result of decreased stomatal conductance and CO 2 concentration within leaf (Ci).”
Claim · model-written summary
Long-term stressed plants had 50% lower photosynthetic capacity than irrigated plants.
Verbatim
e0“photosynthetic capacity in plants experiencing long‐term stress was reduced by 50% when compared with irrigated plants.”
Claim · model-written summary
Drought decreased initial and total Rubisco activity per unit area.
- Treatment
- Droughte0
- Gene
- Rubiscoe0
- Outcome
- initial and the total Rubisco activity per unit areae0
- Direction
- decreasede0
Not reportedTaxonComparator
Verbatim
e0“Drought decreased both the initial and the total Rubisco activity per unit area in a similar way but did not reduce the amount of Rubisco protein per unit leaf area.”
Claim · model-written summary
Drought did not reduce Rubisco protein per unit leaf area.
- Treatment
- Droughte0
- Gene
- Rubiscoe0
- Outcome
- amount of Rubisco protein per unit leaf areae0
- Direction
- did not reducee0
Not reportedTaxonComparator
Verbatim
e0“Drought decreased both the initial and the total Rubisco activity per unit area in a similar way but did not reduce the amount of Rubisco protein per unit leaf area.”
Claim · model-written summary
Rubisco specific activity decreased under water stress, suggesting inhibitor blockage of active sites.
- Gene
- Rubiscoe0
- Outcome
- specific activity of Rubiscoe0
- Direction
- decreasede0
- Qualifier
- under water stress the active sites were blocked by inhibitorse0
Not reportedTaxon
Verbatim
e0“the specific activity of Rubisco, rather than its activation state, decreased suggesting that under water stress the active sites were blocked by inhibitors.”
The same questions in other papers
drought · physiology: photosynthesis · Viridiplantae (plants)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
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.