Abstract
Watermelon [Citrullus lanatus (Thunb.) Mansfeld] is a photophilic plant, whose net photosynthetic rate was significantly decreased when seedlings were grown under low light condition. However, treatment with 100 mg kg-1 5-aminolevulinic acid (ALA) could significantly restore the photosynthetic ability under the environmental stress. The parameters of leaf gas exchange, chlorophyll modulated fluorescence and fast induction fluorescence of the ALA-treated plants were higher than that of the control. Additionally, ALA treatment increased the activities of antioxidant enzymes, including superoxide dismutase (SOD), peroxidase (POD) and ascorbate peroxidase (APX). Nevertheless, the treatment of diethyldithiocarbamate (DDC), an inhibitor of SOD activity, dramatically depressed photosynthesis of watermelon leaves, while ALA could reverse the inhibition of DDC. Therefore, it can be deduced that ALA promotion on photosynthesis of watermelon leaves under low light stress is attributed to its promotion on antioxidant enzyme activities, and the increased activities of the enzymes, which are mainly located near the reaction centers of PSI, can scavenge superoxide anions, leading to an increase of apparent electron transport rate and an alleviation of photosynthetic photoinhibition under the stressed environment.
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Claims 11
Claim · model-written summary
Low light significantly decreased net photosynthetic rate in watermelon seedlings.
- Taxon
- Watermelon
Citrullus lanatuse0 - Organ / stage
- seedlingse0
- Treatment
- low light conditione0
- Outcome
- net photosynthetic ratee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Watermelon [Citrullus lanatus (Thunb.) Mansfeld] is a photophilic plant, whose net photosynthetic rate was significantly decreased when seedlings were grown under low light condition.”
Claim · model-written summary
ALA at 100 mg kg-1 significantly restored photosynthetic ability under low light.
- Taxon
- WatermelonCitrullus lanatuse1
- Treatment
- 100 mg kg-1 5-aminolevulinic acid (ALA)e0
- Outcome
- photosynthetic abilitye0
- Direction
- restoree0
- Qualifier
- under the environmental stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatment with 100 mg kg-1 5-aminolevulinic acid (ALA) could significantly restore the photosynthetic ability under the environmental stress.”
e1“Watermelon [Citrullus lanatus (Thunb.) Mansfeld]”
Claim · model-written summary
ALA treated plants had higher leaf gas exchange parameters than controls.
- Taxon
- WatermelonCitrullus lanatuse1
- Treatment
- ALA-treatede0
- Outcome
- leaf gas exchangee0
- Direction
- highere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The parameters of leaf gas exchange, chlorophyll modulated fluorescence and fast induction fluorescence of the ALA-treated plants were higher than that of the control.”
e1“Watermelon [Citrullus lanatus (Thunb.) Mansfeld]”
Claim · model-written summary
ALA treated plants had higher chlorophyll modulated fluorescence than controls.
- Taxon
- WatermelonCitrullus lanatuse1
- Treatment
- ALA-treatede0
- Outcome
- chlorophyll modulated fluorescencee0
- Direction
- highere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The parameters of leaf gas exchange, chlorophyll modulated fluorescence and fast induction fluorescence of the ALA-treated plants were higher than that of the control.”
e1“Watermelon [Citrullus lanatus (Thunb.) Mansfeld]”
Claim · model-written summary
ALA treated plants had higher fast induction fluorescence than controls.
- Taxon
- WatermelonCitrullus lanatuse1
- Treatment
- ALA-treatede0
- Outcome
- fast induction fluorescencee0
- Direction
- highere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The parameters of leaf gas exchange, chlorophyll modulated fluorescence and fast induction fluorescence of the ALA-treated plants were higher than that of the control.”
e1“Watermelon [Citrullus lanatus (Thunb.) Mansfeld]”
Claim · model-written summary
ALA increased superoxide dismutase, peroxidase and ascorbate peroxidase activities.
- Taxon
- WatermelonCitrullus lanatuse1
- Treatment
- ALA treatmente0
- Gene
- superoxide dismutase (SOD), peroxidase (POD) and ascorbate peroxidase (APX)e0
- Outcome
- activities of antioxidant enzymese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ALA treatment increased the activities of antioxidant enzymes, including superoxide dismutase (SOD), peroxidase (POD) and ascorbate peroxidase (APX).”
e1“Watermelon [Citrullus lanatus (Thunb.) Mansfeld]”
Claim · model-written summary
DDC treatment dramatically depressed photosynthesis in watermelon leaves.
- Taxon
- watermelonCitrullus lanatuse0
- Organ / stage
- leavese0
- Treatment
- diethyldithiocarbamate (DDC)e0
- Outcome
- photosynthesis of watermelon leavese0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the treatment of diethyldithiocarbamate (DDC), an inhibitor of SOD activity, dramatically depressed photosynthesis of watermelon leaves”
Claim · model-written summary
ALA reversed the DDC inhibition of watermelon leaf photosynthesis.
- Taxon
- watermelonCitrullus lanatuse0
- Treatment
- ALAe0
- Outcome
- photosynthesis of watermelon leavese0
- Direction
- reversee0
- Comparator
- DDCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the treatment of diethyldithiocarbamate (DDC), an inhibitor of SOD activity, dramatically depressed photosynthesis of watermelon leaves, while ALA could reverse the inhibition of DDC.”
Claim · model-written summary
The authors infer that ALA promotes low light photosynthesis through antioxidant enzyme activity.
- Taxon
- watermelonCitrullus lanatuse0
- Treatment
- ALAe0
- Outcome
- photosynthesis of watermelon leavese0
- Qualifier
- promotion on antioxidant enzyme activitiese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ALA promotion on photosynthesis of watermelon leaves under low light stress is attributed to its promotion on antioxidant enzyme activities”
Claim · model-written summary
The authors infer that antioxidant enzymes scavenge superoxide anions, increasing apparent electron transport rate.
- Taxon
- watermelonCitrullus lanatuse1
- Outcome
- apparent electron transport ratee0
- Direction
- increasee0
- Qualifier
- scavenge superoxide anionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increased activities of the enzymes, which are mainly located near the reaction centers of PSI, can scavenge superoxide anions, leading to an increase of apparent electron transport rate”
e1“photosynthesis of watermelon leaves under low light stress”
Claim · model-written summary
The authors infer that antioxidant enzyme activity alleviates photoinhibition under low light stress.
- Taxon
- watermelonCitrullus lanatuse1
- Outcome
- photosynthetic photoinhibitione0
- Direction
- alleviatione0
- Qualifier
- scavenge superoxide anionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increased activities of the enzymes, which are mainly located near the reaction centers of PSI, can scavenge superoxide anions, leading to an increase of apparent electron transport rate and an alleviation of photosynthetic photoinhibition under the stressed environment.”
e1“photosynthesis of watermelon leaves under low light stress”
The same questions in other papers
5-aminolevulinic acid · physiology: antioxidant enzymes · Citrullus lanatus (watermelon)Positive and negative results
1 in the opposite direction
- no effect
5-aminolevulinic acid · physiology: photosynthesis · Citrullus lanatus (watermelon)Results agree
1 paper in the same direction as this paper
- positive
light · physiology: photosynthesis · Citrullus lanatus (watermelon)Positive and negative results
2 papers in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
6 papers more in this group
See all 10 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.