Abstract
Camellia oleifera, a woody oilseed species endemic to China, often experiences growth constraints due to seasonal drought. This study investigates the coordinated regulation of photosynthetic traits, stomatal behavior, and hormone responses during drought–rehydration cycles in two cultivars with contrasting drought resistance: ‘CL53’ (tolerant) and ‘CL40’ (sensitive). Photosynthetic inhibition resulted from both stomatal and non-stomatal limitations, with cultivar-specific differences. After 28 days of drought, the net photosynthetic rate (Pn) declined by 26.6% in CL53 and 32.6% in CL40. A stable intercellular CO2 concentration (Ci) in CL53 indicated superior mesophyll integrity and antioxidant capacity. CL53 showed rapid Pn recovery and photosynthetic compensation post-rehydration, in contrast to CL40. Drought triggered extensive stomatal closure; >98% reopened upon rehydration, though the total stomatal pore area remained reduced. Abscisic acid (ABA) accumulation was greater in CL40, contributing to stomatal closure and Pn suppression. CL53 exhibited faster ABA degradation and gibberellin (GA3) recovery, promoting photosynthetic restoration. ABA negatively correlated with Pn, transpiration rate (Tr), stomatal conductance (Gs), and Ci, but positively with stomatal limitation (Ls). Water use efficiency (WUE) displayed a parabolic response to ABA, differing by cultivar. This integrative analysis highlights a coordinated photosynthesis–stomata–hormone network underlying drought adaptation and informs selection strategies for drought-resilient cultivars and precision irrigation.
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Claims 18
Claim · model-written summary
Under 28 days of drought, net photosynthetic rate declined by 26.6% in CL53.
- Taxon
- Camellia oleifera
Camellia oleiferat0 - Material
- CL53e1
- Treatment
- 28 days of droughte1
- Outcome
- net photosynthetic rate (Pn)e1
- Direction
- declinede1
- Value
- 26.6%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e1“After 28 days of drought, the net photosynthetic rate (Pn) declined by 26.6% in CL53 and 32.6% in CL40”
Claim · model-written summary
Under 28 days of drought, net photosynthetic rate declined by 32.6% in CL40.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Material
- CL40e1
- Treatment
- 28 days of droughte1
- Outcome
- net photosynthetic rate (Pn)e1
- Direction
- declinede1
- Value
- 32.6%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e1“After 28 days of drought, the net photosynthetic rate (Pn) declined by 26.6% in CL53 and 32.6% in CL40”
Claim · model-written summary
Intercellular CO2 concentration (Ci) remained stable in CL53.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Material
- CL53e3
- Outcome
- intercellular CO2 concentration (Ci)e3
- Direction
- stablee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e3“A stable intercellular CO2 concentration (Ci) in CL53 indicated superior mesophyll integrity and antioxidant capacity”
Claim · model-written summary
A stable Ci in CL53 indicates superior mesophyll integrity and antioxidant capacity.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Material
- CL53e3
- Outcome
- superior mesophyll integrity and antioxidant capacitye3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e3“A stable intercellular CO2 concentration (Ci) in CL53 indicated superior mesophyll integrity and antioxidant capacity”
Claim · model-written summary
CL53 showed rapid Pn recovery after rehydration, in contrast to CL40.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Material
- CL53e4
- Outcome
- Pn recoverye4
- Direction
- rapide4
- Qualifier
- in contrast to CL40e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e4“CL53 showed rapid Pn recovery and photosynthetic compensation post-rehydration, in contrast to CL40”
Claim · model-written summary
Drought triggered extensive stomatal closure.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Treatment
- Droughte5
- Outcome
- stomatal closuree5
- Direction
- extensivee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e5“Drought triggered extensive stomatal closure”
Claim · model-written summary
More than 98% of stomata reopened upon rehydration.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Treatment
- rehydratione6
- Outcome
- reopenede6
- Value
- >98%e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e6“>98% reopened upon rehydration, though the total stomatal pore area remained reduced”
Claim · model-written summary
Total stomatal pore area remained reduced after rehydration.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Outcome
- total stomatal pore areae6
- Direction
- remained reducede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e6“>98% reopened upon rehydration, though the total stomatal pore area remained reduced”
Claim · model-written summary
ABA accumulation was greater in CL40.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Material
- CL40e7
- Compound
- Abscisic acid (ABA)e7
- Outcome
- Abscisic acid (ABA) accumulatione7
- Direction
- greatere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e7“Abscisic acid (ABA) accumulation was greater in CL40, contributing to stomatal closure and Pn suppression”
Claim · model-written summary
ABA accumulation contributes to stomatal closure and Pn suppression in CL40.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Material
- CL40e7
- Compound
- Abscisic acid (ABA)e7
- Outcome
- stomatal closure and Pn suppressione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e7“Abscisic acid (ABA) accumulation was greater in CL40, contributing to stomatal closure and Pn suppression”
Claim · model-written summary
CL53 showed faster ABA degradation.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Material
- CL53e0
- Outcome
- ABA degradatione0
- Direction
- fastere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e0“CL53 exhibited faster ABA degradation and gibberellin (GA3) recovery, promoting photosynthetic restoration”
Claim · model-written summary
CL53 showed gibberellin (GA3) recovery.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Material
- CL53e0
- Outcome
- gibberellin (GA3) recoverye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e0“CL53 exhibited faster ABA degradation and gibberellin (GA3) recovery, promoting photosynthetic restoration”
Claim · model-written summary
Faster ABA degradation and GA3 recovery in CL53 promote photosynthetic restoration.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Material
- CL53e0
- Compound
- gibberellin (GA3)e0
- Outcome
- photosynthetic restoratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e0“CL53 exhibited faster ABA degradation and gibberellin (GA3) recovery, promoting photosynthetic restoration”
Claim · model-written summary
ABA was negatively correlated with Pn, Tr and Gs.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Compound
- ABAe0
- Outcome
- Pn, transpiration rate (Tr), stomatal conductance (Gs)e0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e0“ABA negatively correlated with Pn, transpiration rate (Tr), stomatal conductance (Gs), and Ci”
Claim · model-written summary
ABA was negatively correlated with Ci.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Compound
- ABAe0
- Outcome
- Cie0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e0“ABA negatively correlated with Pn, transpiration rate (Tr), stomatal conductance (Gs), and Ci”
Claim · model-written summary
ABA was positively correlated with stomatal limitation (Ls).
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Compound
- ABAe0
- Outcome
- stomatal limitation (Ls)e1
- Direction
- positivelye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e0“ABA negatively correlated with Pn, transpiration rate (Tr), stomatal conductance (Gs), and Ci”
e1“but positively with stomatal limitation (Ls)”
Claim · model-written summary
Water use efficiency (WUE) showed a parabolic response to ABA, differing by cultivar.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Compound
- ABAe0
- Outcome
- Water use efficiency (WUE)e0
- Direction
- parabolic responsee0
- Qualifier
- differing by cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e0“Water use efficiency (WUE) displayed a parabolic response to ABA, differing by cultivar”
Claim · model-written summary
Photosynthetic inhibition under drought resulted from both stomatal and non-stomatal limitations.
- Taxon
- Camellia oleiferaCamellia oleiferat0
- Outcome
- Photosynthetic inhibitione0
- Qualifier
- both stomatal and non-stomatal limitationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hormonal Dynamics in Camellia oleifera During Drought and Rehydration”
e0“Photosynthetic inhibition resulted from both stomatal and non-stomatal limitations, with cultivar-specific differences”