Abstract
To investigate drought-induced changes in morphophysiological characteristics, seedlings of two genotypes of Jatropha curcas (CNPAE 183 and CNPAE 191) were grown under two watering regimes: irrigated (-33.1 to 13.5 to kPa) and water deficit (-409.5 to 49.5 to kPa) for 55 days, followed by six days of rehydration (DAR). Withholding water led to a significant reduction (p<0.05) of leaf water potential (ΨW) and an increase in relative water content (RWC). The values of net photosynthetic rate (PN), stomatal conductance to water vapor (gS) and transpiration (E) were significantly (p<0.05) reduced 21 and 34 days after starting treatment (DAST) in plants of genotypes CNPAE 183 and CNPAE 191, respectively. After 6 DAR, only CNPAE 191 achieved a recovery of PN and E. Moreover, significantly (p<0.05) lower gS was measured in recovering plants of both genotypes, as compared to the controls. Drought stress led to reductions of 57 and 65% in whole-plant hydraulic conductance (KL) in genotypes CNPAE 183 and CNPAE 191, respectively. Full recovery of KL was observed after 6 DAR. The average water consumption was 18% lower in plants subjected to water shortage, as compared to irrigated plants. However, drought-induced reduction in growth led to lower biomass water use efficiency (WUEbiomass) in plants subjected to water deficit. The effect of water stress was more intense in CNPAE 183 than in CNPAE 191, regarding the growth variables (leaf area, height and diameter), dry mass and root volume. Moreover, a delay in the effect of water stress in genotype CNPAE 191 was also observed, which suggests a higher tolerance of this genotype as compared to CNPAE 183. Altogether, the results showed strong drought-induced stomatal limitation of carbon assimilation and growth in J. curcas. Slight genotypic differences were detected, CNPAE 191 being less sensitive to the imposed experimental conditions than CNPAE 183. Key words: Hydraulic conductivity, root volume, tolerance, leaf gas exchange, water relations, water status.
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Claims 12
Claim · model-written summary
Water withholding significantly reduced leaf water potential.
- Taxon
- Jatropha curcas
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Jatropha curcast0 - Treatment
- Withholding watere0
- Outcome
- leaf water potentiale0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_tree_at_Samedha.jpg?width=500)
Verbatim
e0“Withholding water led to a significant reduction (p<0.05) of leaf water potential (ΨW) and an increase in relative water content (RWC).”
t0“Jatropha curcas”
Claim · model-written summary
Water withholding increased relative water content.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- Withholding watere0
- Outcome
- relative water contente0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Withholding water led to a significant reduction (p<0.05) of leaf water potential (ΨW) and an increase in relative water content (RWC).”
t0“Jatropha curcas”
Claim · model-written summary
Net photosynthetic rate, stomatal conductance and transpiration significantly declined by 21 days in CNPAE 183 and 34 days in CNPAE 191.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- water deficite1
- Outcome
- net photosynthetic rate (PN), stomatal conductance to water vapor (gS) and transpiration (E)e0
- Direction
- reducede0
- Qualifier
- 21 and 34 days after starting treatment (DAST) in plants of genotypes CNPAE 183 and CNPAE 191, respectivelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The values of net photosynthetic rate (PN), stomatal conductance to water vapor (gS) and transpiration (E) were significantly (p<0.05) reduced 21 and 34 days after starting treatment (DAST) in plants of genotypes CNPAE 183 and CNPAE 191, respectively.”
e1“and water deficit (-409.5 to 49.5 to kPa)”
t0“Jatropha curcas”
Claim · model-written summary
After six days of rehydration, only CNPAE 191 recovered net photosynthesis and transpiration.
- Taxon
- Jatropha curcasJatropha curcast0
- Material
- CNPAE 191e0
- Outcome
- recovery of PN and Ee0
- Qualifier
- After 6 DARe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 6 DAR, only CNPAE 191 achieved a recovery of PN and E.”
t0“Jatropha curcas”
Claim · model-written summary
Stomatal conductance remained significantly lower in recovering plants of both genotypes than controls.
- Taxon
- Jatropha curcasJatropha curcast0
- Outcome
- gSe0
- Direction
- lowere0
- Qualifier
- recovering plants of both genotypese0
- Comparator
- the controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significantly (p<0.05) lower gS was measured in recovering plants of both genotypes, as compared to the controls.”
t0“Jatropha curcas”
Claim · model-written summary
Drought reduced whole-plant hydraulic conductance by 57% in CNPAE 183.
- Taxon
- Jatropha curcasJatropha curcast0
- Material
- CNPAE 183e0
- Treatment
- Drought stresse0
- Outcome
- whole-plant hydraulic conductance (KL)e0
- Direction
- reductionse0
- Value
- 57 and 65%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress led to reductions of 57 and 65% in whole-plant hydraulic conductance (KL) in genotypes CNPAE 183 and CNPAE 191, respectively.”
t0“Jatropha curcas”
Claim · model-written summary
Drought reduced whole-plant hydraulic conductance by 65% in CNPAE 191.
- Taxon
- Jatropha curcasJatropha curcast0
- Material
- CNPAE 191e0
- Treatment
- Drought stresse0
- Outcome
- whole-plant hydraulic conductance (KL)e0
- Direction
- reductionse0
- Value
- 65%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress led to reductions of 57 and 65% in whole-plant hydraulic conductance (KL) in genotypes CNPAE 183 and CNPAE 191, respectively.”
t0“Jatropha curcas”
Claim · model-written summary
Whole-plant hydraulic conductance fully recovered after six days of rehydration.
- Taxon
- Jatropha curcasJatropha curcast0
- Outcome
- Full recovery of KLe0
- Qualifier
- after 6 DARe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Full recovery of KL was observed after 6 DAR.”
t0“Jatropha curcas”
Claim · model-written summary
Water shortage reduced average water consumption by 18% relative to irrigation.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- water shortagee0
- Outcome
- average water consumptione0
- Direction
- lowere0
- Value
- 18%e0
- Comparator
- irrigated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average water consumption was 18% lower in plants subjected to water shortage, as compared to irrigated plants.”
t0“Jatropha curcas”
Claim · model-written summary
Drought reduced growth and lowered biomass water use efficiency.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- water deficite0
- Outcome
- biomass water use efficiency (WUEbiomass)e0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-induced reduction in growth led to lower biomass water use efficiency (WUEbiomass) in plants subjected to water deficit.”
t0“Jatropha curcas”
Claim · model-written summary
Water stress affected growth traits, dry mass and root volume more intensely in CNPAE 183 than CNPAE 191.
- Taxon
- Jatropha curcasJatropha curcast0
- Material
- CNPAE 183e0
- Outcome
- growth variables (leaf area, height and diameter), dry mass and root volumee0
- Direction
- more intensee0
- Comparator
- CNPAE 191e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of water stress was more intense in CNPAE 183 than in CNPAE 191, regarding the growth variables (leaf area, height and diameter), dry mass and root volume.”
t0“Jatropha curcas”
Claim · model-written summary
The water stress effect was delayed in CNPAE 191, suggesting higher tolerance than CNPAE 183.
- Taxon
- Jatropha curcasJatropha curcast0
- Material
- CNPAE 191e0
- Outcome
- higher tolerancee0
- Direction
- highere0
- Comparator
- CNPAE 183e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a delay in the effect of water stress in genotype CNPAE 191 was also observed, which suggests a higher tolerance of this genotype as compared to CNPAE 183.”
t0“Jatropha curcas”
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