Abstract
Jatropha curcas L. is a plant with various commercial uses, and drought is an important limiting factor for its distribution and production. In this study, we investigated the role of drought hardening in an increased drought tolerance in J. curcas, and the involvement of osmoregulation and biochemical pathways in this enhanced tolerance. Results show that a drought hardening treatment with 10 % (m/v) polyethylene glycol 6000 for two days significantly increased a survival rate, decreased the content of malondialdehyde, and alleviated electrolyte leakage in the J. curcas seedlings under the drought stress. Measurements of leaf water potential, osmotic potential, and pressure potential show that this drought hardening treatment can improve the water status of J. curcas seedlings during the early phase of drought stress. In addition, the drought hardening treatment gradually increased the concentrations of compatible solutes proline, glycinebetaine, and soluble sugars during drought hardening and subsequent drought stress. It also clearly raised the activity of betaine aldehyde dehydrogenase, a key enzyme for the glycinebataine biosynhthesis as well as the activity of enzymes Δ1-pyrroline-5-carboxylate synthetase (P5CS), glutamate dehydrogenase, arginase, and ornithine aminotransferase, all key enzymes in the proline biosynthesis. The expression of P5CS gene in the J. curcas seedlings also increased during drought hardening and subsequent drought stress, but the activity of proline dehydrogenase decreased. These results show that the drought hardening treatment can enhance drought tolerance in J. curcas, and osmoregulation is a key factor in this increased drought tolerance.
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Claims 11
Claim · model-written summary
Drought hardening with PEG 6000 significantly increased the survival rate of Jatropha curcas seedlings under drought stress.
- Taxon
- Jatropha curcas
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Jatropha curcase2 - Treatment
- drought hardening treatment with 10 % (m/v) polyethylene glycol 6000 for two dayse1
- Outcome
- survival ratee1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_tree_at_Samedha.jpg?width=500)
Verbatim
e1“a drought hardening treatment with 10 % (m/v) polyethylene glycol 6000 for two days significantly increased a survival rate”
e2“Jatropha curcas L.”
Claim · model-written summary
Drought hardening decreased the malondialdehyde content of Jatropha curcas seedlings under drought stress.
- Taxon
- Jatropha curcasJatropha curcase2
- Treatment
- drought hardening treatment with 10 % (m/v) polyethylene glycol 6000 for two dayse1
- Outcome
- content of malondialdehydee1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“a drought hardening treatment with 10 % (m/v) polyethylene glycol 6000 for two days significantly increased a survival rate, decreased the content of malondialdehyde, and alleviated electrolyte leakage”
e2“Jatropha curcas L.”
Claim · model-written summary
Drought hardening alleviated electrolyte leakage of Jatropha curcas seedlings under drought stress.
- Taxon
- Jatropha curcasJatropha curcase2
- Treatment
- drought hardening treatment with 10 % (m/v) polyethylene glycol 6000 for two dayse1
- Outcome
- electrolyte leakagee1
- Direction
- alleviatede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“a drought hardening treatment with 10 % (m/v) polyethylene glycol 6000 for two days significantly increased a survival rate, decreased the content of malondialdehyde, and alleviated electrolyte leakage”
e2“Jatropha curcas L.”
Claim · model-written summary
Drought hardening can improve the water status of Jatropha curcas seedlings in the early phase of drought stress.
- Taxon
- J. curcasJatropha curcase1
- Treatment
- drought hardening treatmente1
- Outcome
- water statuse1
- Direction
- improvee1
- Qualifier
- during the early phase of drought stresse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Measurements of leaf water potential, osmotic potential, and pressure potential show that this drought hardening treatment can improve the water status of J. curcas seedlings during the early phase of drought stress”
Claim · model-written summary
Drought hardening increased the concentrations of the compatible solutes proline, glycinebetaine and soluble sugars during hardening and subsequent drought stress.
- Taxon
- Jatropha curcasJatropha curcase2
- Treatment
- drought hardening treatmente1
- Outcome
- concentrations of compatible solutes proline, glycinebetaine, and soluble sugarse1
- Direction
- increasede1
- Qualifier
- during drought hardening and subsequent drought stresse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the drought hardening treatment gradually increased the concentrations of compatible solutes proline, glycinebetaine, and soluble sugars during drought hardening and subsequent drought stress”
e2“Jatropha curcas L.”
Claim · model-written summary
Drought hardening raised the activity of betaine aldehyde dehydrogenase in Jatropha curcas seedlings.
- Taxon
- Jatropha curcasJatropha curcase3
- Treatment
- drought hardening treatmente2
- Gene
- betaine aldehyde dehydrogenasee1
- Outcome
- activitye1
- Direction
- raisede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“It also clearly raised the activity of betaine aldehyde dehydrogenase”
e2“Results show that a drought hardening treatment”
e3“Jatropha curcas L.”
Claim · model-written summary
Drought hardening raised the activity of P5CS, glutamate dehydrogenase and arginase in Jatropha curcas seedlings.
- Taxon
- Jatropha curcasJatropha curcase3
- Treatment
- drought hardening treatmente2
- Outcome
- activity of enzymes Δ1-pyrroline-5-carboxylate synthetase (P5CS), glutamate dehydrogenase, arginasee1
- Direction
- raisede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“It also clearly raised the activity of betaine aldehyde dehydrogenase, a key enzyme for the glycinebataine biosynhthesis as well as the activity of enzymes Δ1-pyrroline-5-carboxylate synthetase (P5CS), glutamate dehydrogenase, arginase, and ornithine aminotransferase”
e2“Results show that a drought hardening treatment”
e3“Jatropha curcas L.”
Claim · model-written summary
Drought hardening raised the activity of ornithine aminotransferase in Jatropha curcas seedlings.
- Taxon
- Jatropha curcasJatropha curcase3
- Treatment
- drought hardening treatmente2
- Gene
- ornithine aminotransferasee1
- Outcome
- activitye1
- Direction
- raisede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“It also clearly raised the activity of betaine aldehyde dehydrogenase, a key enzyme for the glycinebataine biosynhthesis as well as the activity of enzymes Δ1-pyrroline-5-carboxylate synthetase (P5CS), glutamate dehydrogenase, arginase, and ornithine aminotransferase”
e2“Results show that a drought hardening treatment”
e3“Jatropha curcas L.”
Claim · model-written summary
Drought hardening increased the expression of the P5CS gene in Jatropha curcas seedlings.
- Taxon
- J. curcasJatropha curcase1
- Treatment
- drought hardeninge1
- Gene
- P5CSe1
- Outcome
- expression of P5CS genee1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The expression of P5CS gene in the J. curcas seedlings also increased during drought hardening and subsequent drought stress”
Claim · model-written summary
Drought hardening decreased the activity of proline dehydrogenase in Jatropha curcas seedlings.
- Taxon
- Jatropha curcasJatropha curcase2
- Treatment
- drought hardeninge3
- Gene
- proline dehydrogenasee1
- Outcome
- activitye1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“but the activity of proline dehydrogenase decreased”
e2“Jatropha curcas L.”
e3“The expression of P5CS gene in the J. curcas seedlings also increased during drought hardening and subsequent drought stress”
Claim · model-written summary
Osmoregulation is a key factor in the drought tolerance enhanced by drought hardening in Jatropha curcas.
- Taxon
- J. curcasJatropha curcase1
- Treatment
- drought hardening treatmente1
- Outcome
- drought tolerancee1
- Qualifier
- osmoregulation is a key factore1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“These results show that the drought hardening treatment can enhance drought tolerance in J. curcas, and osmoregulation is a key factor in this increased drought tolerance”
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See all 5 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.