Abstract
The fodder soybean (Glycine max) is an excellent leguminous forage with a high protein content and hay yield, cultivated comprehensively in alpine regions, but seasonal drought in northern regions severely impacts the growth of seedlings. Melatonin (MT) and strigolactone (SL) are critical in relieving the restraint of plant growth in water-deficient environments, but the mechanisms of MT- and SL-mediated drought resistance in fodder soybean needs to be explored. This study mainly investigated the potential morphophysiological mechanism of MT and SL treatments in protecting fodder soybean from drought stress. The fodder soybean ‘Gongnong 535’ was treated with 100 µM MT or 1 µM SL under normal, moderate, and severe water deficit conditions. The results showed that MT and SL treatments enhanced the plant growth parameters and stomatal aperture under drought stress. Moreover, the observed reductions in superoxide ion (O2.-), malondialdehyde (MDA), and relative electrical conductivity (REC), along with enhancements in the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT), as well as higher levels of ascorbate (AsA), glutathione (GSH), soluble sugar (SS), soluble protein (SP), and free proline (Pro), indicated that MT and SL application effectively alleviated the oxidative damage and prevented the cell membrane disruption caused by drought stress. Additionally, MT and SL treatments improved photosynthesis and growth in fodder soybean seedlings under water stress by adjusting chlorophyll pigments, gas exchange indexes, and chlorophyll fluorescence parameters, as well as endogenous hormone levels. Simultaneously, MT and SL influenced the expression of genes associated with photosynthesis and antioxidant defenses, as well as phytohormone concentrations. Notably, the protective effect of the SL treatment was superior to that of MT in water-deficient conditions. This study contributes to further understanding the defensive mechanism of MT and SL against drought stress.
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Claims 7
Claim · model-written summary
MT and SL enhanced growth and stomatal aperture under drought.
- Taxon
- fodder soybeant0
- Treatment
- MT and SL treatmentse0
- Outcome
- plant growth parameters and stomatal aperturee0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“MT and SL treatments enhanced the plant growth parameters and stomatal aperture under drought stress.”
t0“Fodder Soybean Seedlings”
Claim · model-written summary
MT and SL reduced oxidative damage indicators.
- Taxon
- fodder soybeant0
- Outcome
- superoxide ion (O2.-), malondialdehyde (MDA), and relative electrical conductivity (REC)e0
- Direction
- reductionse0
Not reportedTreatmentComparator
Verbatim
e0“reductions in superoxide ion (O2.-), malondialdehyde (MDA), and relative electrical conductivity (REC)”
t0“Fodder Soybean Seedlings”
Claim · model-written summary
MT and SL enhanced antioxidant enzyme activities.
- Taxon
- fodder soybeant0
- Outcome
- activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)e0
- Direction
- enhancementse0
Not reportedTreatmentComparator
Verbatim
e0“enhancements in the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)”
t0“Fodder Soybean Seedlings”
Claim · model-written summary
MT and SL raised antioxidant and osmolyte levels.
- Taxon
- fodder soybeant0
- Outcome
- levels of ascorbate (AsA), glutathione (GSH), soluble sugar (SS), soluble protein (SP), and free proline (Pro)e0
- Direction
- highere0
Not reportedTreatmentComparator
Verbatim
e0“higher levels of ascorbate (AsA), glutathione (GSH), soluble sugar (SS), soluble protein (SP), and free proline (Pro)”
t0“Fodder Soybean Seedlings”
Claim · model-written summary
MT and SL improved photosynthesis and growth under water stress.
- Taxon
- fodder soybeane0
- Treatment
- MT and SL treatmentse0
- Outcome
- photosynthesis and growthe0
- Direction
- improvede0
Not reportedComparator
Verbatim
e0“MT and SL treatments improved photosynthesis and growth in fodder soybean seedlings under water stress”
Claim · model-written summary
MT and SL influenced photosynthesis and antioxidant gene expression.
- Taxon
- fodder soybeant0
- Treatment
- MT and SLe0
- Outcome
- expression of genes associated with photosynthesis and antioxidant defensese0
Not reportedComparatorDirection
Verbatim
e0“MT and SL influenced the expression of genes associated with photosynthesis and antioxidant defenses, as well as phytohormone concentrations.”
t0“Fodder Soybean Seedlings”
Claim · model-written summary
SL was more protective than MT under water deficit.
Verbatim
e0“the protective effect of the SL treatment was superior to that of MT in water-deficient conditions.”
t0“Fodder Soybean Seedlings”
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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.