Abstract
Abstract Melatonin (MT) is a key regulator in plants’ response to leaf senescence induced by aging or various abiotic stresses. Here, we demonstrated that darkness and leaf aging enhance endogenous MT levels by upregulating key genes involved in MT synthesis. Additionally, exogenous MT application significantly mitigated leaf senescence induced by darkness and leaf aging in tomato plants, leading to higher chlorophyll content and maximum photochemical efficiency (Fv/Fm) compared to the control. Using Solanum lycopersicum L. tryptophan decarboxylase ( SlTDC )-overexpressed and -knockout transgenic tomato seedlings, we found that SlTDC overexpression increased endogenous MT content and suppressed mRNA levels of chlorophyll degradation-related genes: pheophorbide a oxygenase ( PAO ), pheophytinase ( PPH ), and non-yellow coloring1 like ( NOL ). Furthermore, SlTDC overexpression alleviated photosystem II complex (PSII) photoinhibition, increased ribulose-1,5-bisphosphate carboxylase (Rubisco) and Rubisco activase (RCA) activities and mRNA levels, and maintained higher photosynthetic efficiency in leaves under darkness and in leaves aged over 35 d compared to wild-type plants. Conversely, SlTDC knockout accelerated darkness- or leaf aging-induced leaf senescence in tomatoes. Our findings suggest that MT application or SlTDC overexpression can effectively alleviate leaf senescence by regulating photosynthesis in tomato plants.
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Claims 10
Claim · model-written summary
Darkness and leaf aging enhanced endogenous melatonin.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- darkness and leaf aginge0
- Outcome
- endogenous MT levelse0
- Direction
- enhancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“darkness and leaf aging enhance endogenous MT levels by upregulating key genes involved in MT synthesis.”
t0“tomato”
Claim · model-written summary
Darkness and leaf aging upregulated melatonin synthesis genes.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- darkness and leaf aginge0
- Outcome
- key genes involved in MT synthesise0
- Direction
- upregulatinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“darkness and leaf aging enhance endogenous MT levels by upregulating key genes involved in MT synthesis.”
t0“tomato”
Claim · model-written summary
Exogenous melatonin mitigated darkness- and aging-induced senescence.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- exogenous MT applicatione0
- Outcome
- leaf senescencee0
- Direction
- mitigatede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous MT application significantly mitigated leaf senescence induced by darkness and leaf aging in tomato plants, leading to higher chlorophyll content and maximum photochemical efficiency (Fv/Fm) compared to the control.”
Claim · model-written summary
Melatonin-treated tomato had higher chlorophyll content and Fv/Fm than controls.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- exogenous MT applicatione0
- Outcome
- chlorophyll content and maximum photochemical efficiency (Fv/Fm)e0
- Direction
- highere0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous MT application significantly mitigated leaf senescence induced by darkness and leaf aging in tomato plants, leading to higher chlorophyll content and maximum photochemical efficiency (Fv/Fm) compared to the control.”
Claim · model-written summary
SlTDC overexpression increased endogenous melatonin content.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SlTDC overexpressione0
- Gene
- SlTDCe0
- Outcome
- endogenous MT contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SlTDC overexpression increased endogenous MT content and suppressed mRNA levels of chlorophyll degradation-related genes: pheophorbide a oxygenase ( PAO ), pheophytinase ( PPH ), and non-yellow coloring1 like ( NOL ).”
t0“tomato”
Claim · model-written summary
SlTDC overexpression suppressed PAO, PPH and NOL mRNA levels.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SlTDC overexpressione0
- Gene
- pheophorbide a oxygenase ( PAO ), pheophytinase ( PPH ), and non-yellow coloring1 like ( NOL )e0
- Outcome
- mRNA levels of chlorophyll degradation-related genese0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SlTDC overexpression increased endogenous MT content and suppressed mRNA levels of chlorophyll degradation-related genes: pheophorbide a oxygenase ( PAO ), pheophytinase ( PPH ), and non-yellow coloring1 like ( NOL ).”
t0“tomato”
Claim · model-written summary
SlTDC overexpression alleviated PSII photoinhibition.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SlTDC overexpressione0
- Outcome
- photosystem II complex (PSII) photoinhibitione0
- Direction
- alleviatede0
- Comparator
- wild-type plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SlTDC overexpression alleviated photosystem II complex (PSII) photoinhibition, increased ribulose-1,5-bisphosphate carboxylase (Rubisco) and Rubisco activase (RCA) activities and mRNA levels, and maintained higher photosynthetic efficiency in leaves under darkness and in leaves aged over 35 d compared to wild-type plants.”
t0“tomato”
Claim · model-written summary
SlTDC overexpression increased Rubisco and RCA activities and mRNA levels.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SlTDC overexpressione0
- Gene
- ribulose-1,5-bisphosphate carboxylase (Rubisco) and Rubisco activase (RCA)e0
- Outcome
- activities and mRNA levelse0
- Direction
- increasede0
- Comparator
- wild-type plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SlTDC overexpression alleviated photosystem II complex (PSII) photoinhibition, increased ribulose-1,5-bisphosphate carboxylase (Rubisco) and Rubisco activase (RCA) activities and mRNA levels, and maintained higher photosynthetic efficiency in leaves under darkness and in leaves aged over 35 d compared to wild-type plants.”
t0“tomato”
Claim · model-written summary
SlTDC overexpression maintained higher photosynthetic efficiency under darkness and aging.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SlTDC overexpressione0
- Outcome
- photosynthetic efficiencye0
- Direction
- highere0
- Qualifier
- under darkness and in leaves aged over 35 de0
- Comparator
- wild-type plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SlTDC overexpression alleviated photosystem II complex (PSII) photoinhibition, increased ribulose-1,5-bisphosphate carboxylase (Rubisco) and Rubisco activase (RCA) activities and mRNA levels, and maintained higher photosynthetic efficiency in leaves under darkness and in leaves aged over 35 d compared to wild-type plants.”
t0“tomato”
Claim · model-written summary
SlTDC knockout accelerated darkness- or age-induced leaf senescence.
- Taxon
- tomatoesSolanum lycopersicume0
- Treatment
- SlTDC knockoute0
- Outcome
- leaf senescencee0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SlTDC knockout accelerated darkness- or leaf aging-induced leaf senescence in tomatoes.”
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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.