Abstract
Salinity and drought stress, singly or in combination, are major environmental menaces. Jatropha curcas L. is a biodiesel plant that can tolerate long periods of drought. However, the growth performance and stress tolerance based on physical, chemical, and physiological attributes of this plant have not yet been studied. To address this question, J. curcas seedlings were grown in a completely randomized design in plastic pots filled with soil to evaluate the effects of salinity and drought stresses on growth, ionic composition, and physiological attributes. The experiment consisted of six treatments: control (without salinity and drought stress), salinity alone (7.5 dS m−1, 15 dS m−1), drought, and a combination of salinity and drought (7.5 dS m−1+ Drought, 15 dS m−1+Drought). Our results revealed that, compared with the control, both plant height (PH) and stem diameter (SD) were reduced by (83%, 80%, and 77%) and (69%, 56%, and 55%) under salinity and drought combination (15 dS m−1+Drought) after three, six, and nine months, respectively. There was 93% more leaf Na+ found in plants treated with 15 dS m−1+Drought compared with the control. The highest significant average membrane stability index (MSI) and relative water content (RWC) values (81% and 85%, respectively) were found in the control. The MSI and RWC were not influenced by 7.5 dS m−1 and drought treatments and mostly contributed towards stress tolerance. Our findings imply that J. curcas is moderately tolerant to salinity and drought. The Na+ toxicity and disturbance in K+: Na+ ratio were the main contributing factors for limited growth and physiological attributes in this plant.
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Claims 8
Claim · model-written summary
Under combined salinity and drought (15 dS m−1+Drought), plant height of Jatropha curcas was reduced compared with the control by 83%, 80% and 77% after three, six and nine months.
- Taxon
- Jatropha curcas
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Jatropha curcast0 - Treatment
- salinity and drought combination (15 dS m−1+Drought)e2
- Outcome
- plant height (PH)e1
- Direction
- reducede1
- Value
- 83%, 80%, and 77%e1
- Qualifier
- after three, six, and nine monthse2
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_tree_at_Samedha.jpg?width=500)
Verbatim
t0“Jatropha curcas”
e1“compared with the control, both plant height (PH) and stem diameter (SD) were reduced by (83%, 80%, and 77%) and (69%, 56%, and 55%)”
e2“under salinity and drought combination (15 dS m−1+Drought) after three, six, and nine months”
Claim · model-written summary
Under combined salinity and drought (15 dS m−1+Drought), stem diameter of Jatropha curcas was reduced compared with the control by 69%, 56% and 55% after three, six and nine months.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- salinity and drought combination (15 dS m−1+Drought)e2
- Outcome
- stem diameter (SD)e1
- Direction
- reducede1
- Value
- 69%, 56%, and 55%e1
- Qualifier
- after three, six, and nine monthse2
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Jatropha curcas”
e1“compared with the control, both plant height (PH) and stem diameter (SD) were reduced by (83%, 80%, and 77%) and (69%, 56%, and 55%)”
e2“under salinity and drought combination (15 dS m−1+Drought) after three, six, and nine months”
Claim · model-written summary
Plants treated with 15 dS m−1+Drought had 93% more leaf Na+ than the control.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- 15 dS m−1+Droughte3
- Outcome
- leaf Na+e3
- Direction
- moree3
- Value
- 93%e3
- Comparator
- controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Jatropha curcas”
e3“There was 93% more leaf Na+ found in plants treated with 15 dS m−1+Drought compared with the control”
Claim · model-written summary
Membrane stability index (MSI) of Jatropha curcas was highest in the control, at 81%.
- Taxon
- Jatropha curcasJatropha curcast0
- Outcome
- membrane stability index (MSI)e4
- Direction
- higheste4
- Value
- 81%e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Jatropha curcas”
e4“The highest significant average membrane stability index (MSI) and relative water content (RWC) values (81% and 85%, respectively) were found in the control”
Claim · model-written summary
Relative water content (RWC) of Jatropha curcas was highest in the control, at 85%.
- Taxon
- Jatropha curcasJatropha curcast0
- Outcome
- relative water content (RWC)e4
- Direction
- higheste4
- Value
- 85%e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Jatropha curcas”
e4“The highest significant average membrane stability index (MSI) and relative water content (RWC) values (81% and 85%, respectively) were found in the control”
Claim · model-written summary
MSI and RWC of Jatropha curcas were not influenced by 7.5 dS m−1 and drought treatments.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- 7.5 dS m−1 and drought treatmentse6
- Outcome
- MSI and RWCe6
- Direction
- not influencede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Jatropha curcas”
e6“The MSI and RWC were not influenced by 7.5 dS m−1 and drought treatments”
Claim · model-written summary
Na+ toxicity and disturbance in the K+: Na+ ratio were the main factors limiting growth and physiological attributes of Jatropha curcas.
- Taxon
- Jatropha curcasJatropha curcast0
- Compound
- Na+e7
- Outcome
- limited growth and physiological attributese7
- Qualifier
- disturbance in K+: Na+ ratioe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Jatropha curcas”
e7“The Na+ toxicity and disturbance in K+: Na+ ratio were the main contributing factors for limited growth and physiological attributes in this plant”
Claim · model-written summary
Jatropha curcas is moderately tolerant to salinity and drought.
- Taxon
- J. curcasJatropha curcase7
- Outcome
- moderately tolerant to salinity and droughte7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Jatropha curcas”
e7“Our findings imply that J. curcas is moderately tolerant to salinity and drought”
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