Abstract
Plant growth, development, and productivity are adversely affected under drought conditions. Previous findings indicated that 5-aminolevulinic acid (ALA) and 24-epibrassinolide (EBL) play an important role in the plant response to adverse environmental conditions. This study demonstrated the role of ALA and EBL on oxidative stress and photosynthetic capacity of drought-stressed ‘Williams’ banana grown under the Egyptian semi-arid conditions. Exogenous application of either ALA or EBL at concentrations of 15, 30, and 45 mg·L−1 significantly restored plant photosynthetic activity and increased productivity under reduced irrigation; this was equivalent to 75% of the plant’s total water requirements. Both compounds significantly reduced drought-induced oxidative damages by increasing antioxidant enzyme activities (superoxide dismutase ‘SOD’, catalase ‘CAT’, and peroxidase ‘POD’) and preserving chloroplast structure. Lipid peroxidation, electrolyte loss and free non-radical H2O2 formation in the chloroplast were noticeably reduced compared to the control, but chlorophyll content and photosynthetic oxygen evolution were increased. Nutrient uptake, auxin and cytokinin levels were also improved with the reduced abscisic acid levels. The results indicated that ALA and EBL could reduce the accumulation of reactive oxygen species and maintain the stability of the chloroplast membrane structure under drought stress. This study suggests that the use of ALA or EBL at 30 mg·L−1 can promote the growth, productivity and fruit quality of drought-stressed banana plants.
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Claims 9
Claim · model-written summary
ALA restored photosynthetic activity and raised productivity under reduced irrigation.
- Taxon
- Bananat0
- Treatment
- ALAe0
- Outcome
- plant photosynthetic activity and increased productivitye0
- Direction
- restorede0
- Qualifier
- under reduced irrigatione0
Not reportedMaterialComparator
Verbatim
e0“Exogenous application of either ALA or EBL at concentrations of 15, 30, and 45 mg·L−1 significantly restored plant photosynthetic activity and increased productivity under reduced irrigation; this was equivalent to 75% of the plant’s total water requirements.”
t0“Banana Plants”
Claim · model-written summary
EBL restored photosynthetic activity and raised productivity under reduced irrigation.
- Taxon
- Bananat0
- Treatment
- EBLe0
- Outcome
- plant photosynthetic activity and increased productivitye0
- Direction
- restorede0
- Qualifier
- under reduced irrigatione0
Not reportedComparator
Verbatim
e0“Exogenous application of either ALA or EBL at concentrations of 15, 30, and 45 mg·L−1 significantly restored plant photosynthetic activity and increased productivity under reduced irrigation; this was equivalent to 75% of the plant’s total water requirements.”
t0“Banana Plants”
Claim · model-written summary
Both compounds increased antioxidant enzyme activities and preserved chloroplast structure.
Not reportedComparator
Verbatim
e0“Both compounds significantly reduced drought-induced oxidative damages by increasing antioxidant enzyme activities (superoxide dismutase ‘SOD’, catalase ‘CAT’, and peroxidase ‘POD’) and preserving chloroplast structure.”
t0“Banana Plants”
Claim · model-written summary
Both compounds reduced drought-induced oxidative damage.
Not reportedComparator
Verbatim
e0“Both compounds significantly reduced drought-induced oxidative damages by increasing antioxidant enzyme activities (superoxide dismutase ‘SOD’, catalase ‘CAT’, and peroxidase ‘POD’) and preserving chloroplast structure.”
t0“Banana Plants”
Claim · model-written summary
Lipid peroxidation, electrolyte loss and chloroplast H2O2 formation were reduced relative to control.
- Taxon
- Bananat0
- Outcome
- Lipid peroxidation, electrolyte loss and free non-radical H2O2 formation in the chloroplaste0
- Direction
- reducede0
- Comparator
- the controle0
Not reportedTreatment
Verbatim
e0“Lipid peroxidation, electrolyte loss and free non-radical H2O2 formation in the chloroplast were noticeably reduced compared to the control, but chlorophyll content and photosynthetic oxygen evolution were increased.”
t0“Banana Plants”
Claim · model-written summary
Chlorophyll content and photosynthetic oxygen evolution increased.
- Taxon
- Bananat0
- Outcome
- chlorophyll content and photosynthetic oxygen evolutione0
- Direction
- increasede0
- Comparator
- the controle0
Not reportedTreatment
Verbatim
e0“Lipid peroxidation, electrolyte loss and free non-radical H2O2 formation in the chloroplast were noticeably reduced compared to the control, but chlorophyll content and photosynthetic oxygen evolution were increased.”
t0“Banana Plants”
Claim · model-written summary
Nutrient uptake, auxin and cytokinin levels improved.
Not reportedTreatmentComparator
Verbatim
e0“Nutrient uptake, auxin and cytokinin levels were also improved with the reduced abscisic acid levels.”
t0“Banana Plants”
Claim · model-written summary
Abscisic acid levels were reduced.
Not reportedTreatmentComparator
Verbatim
e0“Nutrient uptake, auxin and cytokinin levels were also improved with the reduced abscisic acid levels.”
t0“Banana Plants”
Claim · model-written summary
ALA or EBL at 30 mg·L−1 was recommended to promote banana growth, productivity and fruit quality under drought.
Verbatim
e0“This study suggests that the use of ALA or EBL at 30 mg·L−1 can promote the growth, productivity and fruit quality of drought-stressed banana plants.”