Abstract
A greenhouse experiment was conducted to evaluate the effects of water stress on leaf water potential, plant growth, and photosynthesis in purple passionflower ( Passiflora incarnata ). Twenty 4-L pots with two plants in each pot were arranged in a completely randomized design. Ten pots received a daily irrigation dose of 100% evapotranspiration (ET) throughout the 43-day experiment (control). The other 10 pots were subjected to a reduced irrigation (RI) treatment, which was implemented stepwise to achieve a gradual increase in stress, by irrigating them with 50% ET first, then with 25% ET and, finally, with 10% ET. The last stress phase was followed by a recovery phase in which all treatments received the same amount of water (100% ET). A lower water potential was obtained at 10% ET compared with control plants (−2.51 and −0.98 MPa, respectively). Plants in both 25% and 10% ET irrigation treatments had reduced net CO 2 assimilation rates (4.25 and 3.50 μmol·m −2 ·s −1 , respectively) than plants watered with 100% ET (8.53 and 6.77 μmol·m −2 ·s −1 , respectively). Values of maximum carboxylation rate allowed by rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase), calculated 31 days after treatment (DAT) application (when RI plants were irrigated with 10% ET) decreased by ≈60%, whereas rate of photosynthetic electron transport and triose phosphate use (TPU) were reduced by ≈30% and ≈45% in the stress treatment compared with the control during the 10% ET irrigation period, respectively. Values of water potential and net CO 2 assimilation rates in previously stressed plants were not different from the control treatment in the recovery phase, suggesting that P. incarnata plants could adapt well to landscaping situations where periods of extreme drought can be expected.
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Claims 7
Claim · model-written summary
The 10% ET irrigation lowered leaf water potential compared with control plants in Passiflora incarnata.
- Taxon
- Passiflora incarnata
Passiflora incarnatae0 - Treatment
- 10% ETe1
- Outcome
- water potentiale1
- Direction
- lowere1
- Value
- −2.51 and −0.98 MPae1
- Comparator
- control plantse1
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A greenhouse experiment was conducted to evaluate the effects of water stress on leaf water potential, plant growth, and photosynthesis in purple passionflower ( Passiflora incarnata )”
e1“A lower water potential was obtained at 10% ET compared with control plants (−2.51 and −0.98 MPa, respectively)”
Claim · model-written summary
Net CO2 assimilation rates were reduced at 25% and 10% ET compared with 100% ET in Passiflora incarnata.
- Taxon
- Passiflora incarnataPassiflora incarnatae0
- Treatment
- 25% and 10% ET irrigation treatmentse2
- Outcome
- net CO 2 assimilation ratese2
- Direction
- reducede2
- Value
- 4.25 and 3.50 μmol·m −2 ·s −1e2
- Comparator
- plants watered with 100% ETe2
- Setting
- greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A greenhouse experiment was conducted to evaluate the effects of water stress on leaf water potential, plant growth, and photosynthesis in purple passionflower ( Passiflora incarnata )”
e2“Plants in both 25% and 10% ET irrigation treatments had reduced net CO 2 assimilation rates (4.25 and 3.50 μmol·m −2 ·s −1 , respectively) than plants watered with 100% ET (8.53 and 6.77 μmol·m −2 ·s −1 , respectively)”
Claim · model-written summary
The 10% ET irrigation decreased the maximum carboxylation rate allowed by rubisco by about 60%.
- Taxon
- Passiflora incarnataPassiflora incarnatae0
- Treatment
- 10% ETe3
- Outcome
- maximum carboxylation rate allowed by rubiscoe3
- Direction
- decreasede3
- Value
- ≈60%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A greenhouse experiment was conducted to evaluate the effects of water stress on leaf water potential, plant growth, and photosynthesis in purple passionflower ( Passiflora incarnata )”
e3“Values of maximum carboxylation rate allowed by rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase), calculated 31 days after treatment (DAT) application (when RI plants were irrigated with 10% ET) decreased by ≈60%”
Claim · model-written summary
The 10% ET irrigation reduced the rate of photosynthetic electron transport by about 30% compared with control.
- Taxon
- Passiflora incarnataPassiflora incarnatae0
- Treatment
- 10% ET irrigatione4
- Outcome
- rate of photosynthetic electron transporte4
- Direction
- reducede4
- Value
- ≈30%e4
- Comparator
- controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A greenhouse experiment was conducted to evaluate the effects of water stress on leaf water potential, plant growth, and photosynthesis in purple passionflower ( Passiflora incarnata )”
e4“rate of photosynthetic electron transport and triose phosphate use (TPU) were reduced by ≈30% and ≈45% in the stress treatment compared with the control during the 10% ET irrigation period”
Claim · model-written summary
The 10% ET irrigation reduced triose phosphate use (TPU) by about 45% compared with control.
- Taxon
- Passiflora incarnataPassiflora incarnatae0
- Treatment
- 10% ET irrigatione4
- Outcome
- triose phosphate use (TPU)e4
- Direction
- reducede4
- Value
- ≈45%e4
- Comparator
- controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A greenhouse experiment was conducted to evaluate the effects of water stress on leaf water potential, plant growth, and photosynthesis in purple passionflower ( Passiflora incarnata )”
e4“rate of photosynthetic electron transport and triose phosphate use (TPU) were reduced by ≈30% and ≈45% in the stress treatment compared with the control during the 10% ET irrigation period”
Claim · model-written summary
After recovery, previously stressed plants showed no difference from control in water potential and net CO2 assimilation rates.
- Taxon
- Passiflora incarnataPassiflora incarnatae0
- Treatment
- previously stressed plantse5
- Outcome
- water potential and net CO 2 assimilation ratese5
- Direction
- not differente5
- Comparator
- control treatmente5
- Setting
- recovery phasee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A greenhouse experiment was conducted to evaluate the effects of water stress on leaf water potential, plant growth, and photosynthesis in purple passionflower ( Passiflora incarnata )”
e5“Values of water potential and net CO 2 assimilation rates in previously stressed plants were not different from the control treatment in the recovery phase”
Claim · model-written summary
Passiflora incarnata plants could adapt well to landscaping situations where extreme drought is expected.
- Taxon
- P. incarnataPassiflora incarnatae6
- Outcome
- adapt well to landscaping situationse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“suggesting that P. incarnata plants could adapt well to landscaping situations where periods of extreme drought can be expected”