Abstract
The effect of different water regimes on Jatropha curcas seedling growth was investigated. The study was carried out in a greenhouse covered with transparent plastic. Seeds were sown in five-liter recipients containing substrate consisting of 3:1:0.5 soil, sand and manure, respectively. A completely randomized plot design was used with seven treatments and five replications. The plants were irrigated with 100% substrate retention capacity until 30 days of age when they were submitted to water volumes of 25%, 50%, 75%, 100%, 125%, 150% and 175% substrate retention capacity for 30 days. The short duration of the research explains the slight decreases in the RMR and TRA but they were sufficient to support the assertion that excess water may have inhibited aquaporin activity and partially reduced soil solution absorption and TRA. Thus, both water deficit and excess water inhibited the growth of J. curcas plants, however, the water deficit inhibited more strongly the development of the species at the initial stages of the restriction, while excess water only caused damage after a longer period of exposure. The assessments were made when the plants were 60 days old. The J. curcas plants showed an isohydric mechanism of stomatal control and maintained turgidity under water shortage, and, under excess water, the alterations in the root system and relative water content preceded reduction in stomatal conductance. The initial growth of J. curcas plants was shown to be sensitive to water shortage and but not very vulnerable to water excess
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Claims 8
Claim · model-written summary
Short exposure caused slight decreases in RMR and TRA.
- Taxon
- Jatropha curcas L.
_tree_at_Samedha.jpg?width=60)
Jatropha curcast0 - Outcome
- RMR and TRAe0
- Direction
- decreasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_tree_at_Samedha.jpg?width=500)
Verbatim
e0“The short duration of the research explains the slight decreases in the RMR and TRA”
t0“Jatropha curcas L.”
Claim · model-written summary
The authors infer that excess water may inhibit aquaporin activity and partially reduce soil solution absorption and TRA.
- Taxon
- Jatropha curcas L.Jatropha curcast0
- Treatment
- excess watere0
- Outcome
- aquaporin activity and partially reduced soil solution absorption and TRAe0
- Direction
- inhibitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excess water may have inhibited aquaporin activity and partially reduced soil solution absorption and TRA”
t0“Jatropha curcas L.”
Claim · model-written summary
Water deficit inhibited growth, more strongly during initial restriction.
- Taxon
- J. curcasJatropha curcase0
- Treatment
- water deficite0
- Outcome
- growth of J. curcas plantse0
- Direction
- inhibitede0
- Qualifier
- initial stages of the restrictione0
- Comparator
- excess watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both water deficit and excess water inhibited the growth of J. curcas plants, however, the water deficit inhibited more strongly the development of the species at the initial stages of the restriction”
t0“Jatropha curcas L.”
Claim · model-written summary
Excess water inhibited growth after longer exposure.
- Taxon
- J. curcasJatropha curcase0
- Treatment
- excess watere0
- Outcome
- growth of J. curcas plantse0
- Direction
- inhibitede0
- Qualifier
- after a longer period of exposuree1
- Comparator
- water deficite0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both water deficit and excess water inhibited the growth of J. curcas plants”
e1“excess water only caused damage after a longer period of exposure”
Claim · model-written summary
Jatropha showed isohydric stomatal control and maintained turgidity during water shortage.
- Taxon
- J. curcasJatropha curcase0
- Treatment
- water shortagee0
- Outcome
- isohydric mechanism of stomatal control and maintained turgiditye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The J. curcas plants showed an isohydric mechanism of stomatal control and maintained turgidity under water shortage”
Claim · model-written summary
Under excess water, root system and relative water content changes preceded lower stomatal conductance.
- Taxon
- Jatropha curcas L.Jatropha curcast0
- Organ / stage
- root systeme0
- Treatment
- excess watere0
- Outcome
- reduction in stomatal conductancee0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under excess water, the alterations in the root system and relative water content preceded reduction in stomatal conductance”
t0“Jatropha curcas L.”
Claim · model-written summary
Initial Jatropha growth was sensitive to water shortage.
- Taxon
- J. curcasJatropha curcase0
- Treatment
- water shortagee0
- Outcome
- initial growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The initial growth of J. curcas plants was shown to be sensitive to water shortage”
Claim · model-written summary
Initial Jatropha growth was not very vulnerable to water excess.
- Taxon
- J. curcasJatropha curcase1
- Treatment
- water excesse0
- Outcome
- initial growthe1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not very vulnerable to water excess”
e1“The initial growth of J. curcas plants”
The same questions in other papers
drought · growth · Jatropha curcasPositive and negative results
5 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 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.