Abstract
Abstract Although plant physiological responses to drought have been widely studied, the interaction between photoprotection, photorespiration and antioxidant metabolism in water‐stressed plants is scarcely addressed. This study aimed to evaluate the physiological adjustments preserving photosynthesis and growth in two plant species with different tolerance to drought: Jatropha curcas and Ricinus communis . We measured stress indicators, gas exchange, photochemistry of PSII and PSI , antioxidant enzymes, cyclic electron flow and photorespiration. Physiological stress indicators associated with reduction in growth confirmed R. communis as sensitive and J. curcas as tolerant to drought. Drought induced loss of photosynthesis in R. communis , whereas J. curcas maintained higher leaf gas exchange and photochemistry under drought. In addition, J. curcas showed higher dissipation of excess energy and presented higher cyclic electron flow when exposed to drought. Although none of these mechanisms have been triggered in R. communis , this species showed increases in photorespiration. R. communis displayed loss of Rubisco content while the Rubisco relative abundance did not change in J. curcas under drought. Accordingly, the in vivo maximum Rubisco carboxylation rate ( V cmax ) and the maximum photosynthetic electron transport rate driving Ru BP regeneration ( J max ) were less affected in J. curcas . Both species displayed an efficient antioxidant mechanism by increasing activities of ascorbate peroxidase ( APX ) and superoxide dismutase ( SOD ). Overall, we suggest that the modulation of different photoprotective mechanisms is crucial to mitigate the effects caused by excess energy, maintaining photosynthetic apparatus efficiency and promoting the establishment of young plants of these two species under drought.
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Claims 11
Claim · model-written summary
Drought induced loss of photosynthesis in Ricinus communis.
- Taxon
- R. communis
Ricinus communise2 - Treatment
- droughte2
- Outcome
- photosynthesise2
- Direction
- induced losse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Drought induced loss of photosynthesis in R. communis , whereas J. curcas maintained higher leaf gas exchange and photochemistry under drought”
e1“Physiological stress indicators associated with reduction in growth confirmed R. communis as sensitive and J. curcas as tolerant to drought”
Claim · model-written summary
Jatropha curcas maintained higher leaf gas exchange and photochemistry under drought than Ricinus communis.
- Taxon
- J. curcas
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Jatropha curcase2 - Treatment
- droughte2
- Outcome
- leaf gas exchange and photochemistrye2
- Direction
- highere2
- Comparator
- R. communise2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_tree_at_Samedha.jpg?width=500)
Verbatim
e2“Drought induced loss of photosynthesis in R. communis , whereas J. curcas maintained higher leaf gas exchange and photochemistry under drought”
Claim · model-written summary
Jatropha curcas showed higher dissipation of excess energy under drought.
- Taxon
- J. curcasJatropha curcase3
- Treatment
- droughte3
- Outcome
- dissipation of excess energye3
- Direction
- highere3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“J. curcas showed higher dissipation of excess energy and presented higher cyclic electron flow when exposed to drought”
Claim · model-written summary
Jatropha curcas showed higher cyclic electron flow under drought.
- Taxon
- J. curcasJatropha curcase3
- Treatment
- droughte3
- Outcome
- cyclic electron flowe3
- Direction
- highere3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“J. curcas showed higher dissipation of excess energy and presented higher cyclic electron flow when exposed to drought”
Claim · model-written summary
Ricinus communis showed increased photorespiration under drought.
- Taxon
- R. communisRicinus communise4
- Treatment
- droughte1
- Outcome
- photorespiratione4
- Direction
- increasese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Although none of these mechanisms have been triggered in R. communis , this species showed increases in photorespiration”
e1“Physiological stress indicators associated with reduction in growth confirmed R. communis as sensitive and J. curcas as tolerant to drought”
Claim · model-written summary
Ricinus communis displayed loss of Rubisco content under drought.
- Taxon
- R. communisRicinus communise5
- Treatment
- droughte1
- Outcome
- Rubisco contente5
- Direction
- losse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“R. communis displayed loss of Rubisco content while the Rubisco relative abundance did not change in J. curcas under drought”
e1“Physiological stress indicators associated with reduction in growth confirmed R. communis as sensitive and J. curcas as tolerant to drought”
Claim · model-written summary
The Rubisco relative abundance of Jatropha curcas did not change under drought.
- Taxon
- J. curcasJatropha curcase5
- Treatment
- droughte1
- Outcome
- Rubisco relative abundancee5
- Direction
- did not changee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“R. communis displayed loss of Rubisco content while the Rubisco relative abundance did not change in J. curcas under drought”
e1“Physiological stress indicators associated with reduction in growth confirmed R. communis as sensitive and J. curcas as tolerant to drought”
Claim · model-written summary
The in vivo maximum Rubisco carboxylation rate (Vcmax) of Jatropha curcas was less affected by drought.
- Taxon
- J. curcasJatropha curcase6
- Treatment
- droughte1
- Outcome
- in vivo maximum Rubisco carboxylation ratee6
- Direction
- less affectede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“the in vivo maximum Rubisco carboxylation rate ( V cmax ) and the maximum photosynthetic electron transport rate driving Ru BP regeneration ( J max ) were less affected in J. curcas”
e1“Physiological stress indicators associated with reduction in growth confirmed R. communis as sensitive and J. curcas as tolerant to drought”
Claim · model-written summary
The maximum photosynthetic electron transport rate (Jmax) of Jatropha curcas was less affected by drought.
- Taxon
- J. curcasJatropha curcase6
- Treatment
- droughte1
- Outcome
- maximum photosynthetic electron transport ratee6
- Direction
- less affectede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“the in vivo maximum Rubisco carboxylation rate ( V cmax ) and the maximum photosynthetic electron transport rate driving Ru BP regeneration ( J max ) were less affected in J. curcas”
e1“Physiological stress indicators associated with reduction in growth confirmed R. communis as sensitive and J. curcas as tolerant to drought”
Claim · model-written summary
Ricinus communis increased the activities of ascorbate peroxidase (APX) and superoxide dismutase (SOD) under drought.
- Taxon
- R. communisRicinus communise1
- Treatment
- droughte1
- Outcome
- activities of ascorbate peroxidase ( APX ) and superoxide dismutase ( SOD )e7
- Direction
- increasinge7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Both species displayed an efficient antioxidant mechanism by increasing activities of ascorbate peroxidase ( APX ) and superoxide dismutase ( SOD )”
e1“Physiological stress indicators associated with reduction in growth confirmed R. communis as sensitive and J. curcas as tolerant to drought”
Claim · model-written summary
Jatropha curcas increased the activities of ascorbate peroxidase (APX) and superoxide dismutase (SOD) under drought.
- Taxon
- J. curcasJatropha curcase1
- Treatment
- droughte1
- Outcome
- activities of ascorbate peroxidase ( APX ) and superoxide dismutase ( SOD )e7
- Direction
- increasinge7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Both species displayed an efficient antioxidant mechanism by increasing activities of ascorbate peroxidase ( APX ) and superoxide dismutase ( SOD )”
e1“Physiological stress indicators associated with reduction in growth confirmed R. communis as sensitive and J. curcas as tolerant to drought”
The same questions in other papers
drought · physiology: gas exchange · Jatropha curcasPositive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
drought · physiology: photosynthesis · Jatropha curcasPositive and negative results
6 in the opposite direction
- negative
- negative
- negative
3 papers more in this group
See all 7 papers →drought · physiology: antioxidant enzymes · Ricinus communis (castor bean)Results agree
1 paper in the same direction as this paper
- positive
drought · physiology: antioxidant enzymes · Jatropha curcasResults agree
1 paper in the same direction as this paper
- positive
drought · physiology: photosynthesis · Ricinus communis (castor bean)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
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.