Abstract
Saline-alkali stress (SS) is a common abiotic stress affecting crop cultivation worldwide, seriously inhibiting plant growth and biomass accumulation. Melatonin has been proven to relieve the inhibition of multiple abiotic stresses on plant growth. Therefore, soybean cultivars Heihe 49 (HH49, SS-tolerant) and Henong 95 (HN95, SS-sensitive) were pot-cultured in SS soil and then treated with 300 μM melatonin at the V1 stage, when the first trifoliate leaves were fully unfolded, to investigate if melatonin has an effect on SS. SS increased reactive oxygen species (ROS) accumulation in soybean leaves and thereby induced DNA oxidative damage. In addition, SS retarded cell growth and decreased the mesophyll cell size, chloroplast number, photosynthetic pigment content, which further reduced the light energy capture and electron transport rate in soybean leaves, and affected carbohydrate accumulation and metabolism. However, melatonin treatment reduced SS-induced ROS accumulation in the soybean leaves by increasing antioxidant content and oxidase activity. Effective removal of ROS reduced SS-induced DNA oxidative damage in the soybean leaf genome, which was represented by decreased random-amplified polymorphic DNA polymorphism, 8-hydroxy-20-deoxyguanine content, and relative density of apurinic/apyrimidinic-sites. Melatonin treatment also increased the volume of mesophyll cells, the numbers of chloroplast and starch grains, the contents of chlorophyll a and b and carotenoids in soybean seedling leaves treated with SS, thereby increasing the efficiency of effective light capture and electron transfer and improving photosynthesis. Subsequently, carbohydrate accumulation and metabolism in soybean leaves under SS were improved by melatonin treatment, which contributes to providing basic substances and energy for cell growth and metabolism, ultimately improving soybean SS tolerance.
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Claims 7
Claim · model-written summary
Saline-alkali stress increased ROS accumulation and DNA oxidative damage in soybean leaves.
- Taxon
- soybean
Glycine maxe0 - Organ / stage
- leavese0
- Treatment
- SSe0
- Outcome
- reactive oxygen species (ROS) accumulation in soybean leaves and thereby induced DNA oxidative damagee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SS increased reactive oxygen species (ROS) accumulation in soybean leaves and thereby induced DNA oxidative damage.”
Claim · model-written summary
Saline-alkali stress reduced soybean mesophyll cell size, chloroplast number, and photosynthetic pigments.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- mesophyll celle0
- Treatment
- SSe0
- Outcome
- mesophyll cell size, chloroplast number, photosynthetic pigment contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SS retarded cell growth and decreased the mesophyll cell size, chloroplast number, photosynthetic pigment content”
t0“soybean (Glycine max [L.] Merr.) leaves”
Claim · model-written summary
Saline-alkali stress reduced light capture and electron transport and affected carbohydrate metabolism in soybean leaves.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- leavese0
- Treatment
- saline‐alkali stresst0
- Outcome
- light energy capture and electron transport ratee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which further reduced the light energy capture and electron transport rate in soybean leaves, and affected carbohydrate accumulation and metabolism.”
t0“saline‐alkali stress by decreasing DNA oxidative damage and enhancing photosynthetic carbon metabolism in soybean (Glycine max [L.] Merr.) leaves”
Claim · model-written summary
Melatonin reduced stress-induced ROS accumulation by increasing antioxidant content and oxidase activity.
- Taxon
- soybeanGlycine maxe0
- Treatment
- melatonin treatmente0
- Outcome
- SS-induced ROS accumulatione0
- Direction
- reducede0
- Qualifier
- increasing antioxidant content and oxidase activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“melatonin treatment reduced SS-induced ROS accumulation in the soybean leaves by increasing antioxidant content and oxidase activity.”
Claim · model-written summary
Melatonin reduced three DNA oxidative damage indicators in soybean leaves.
- Taxon
- soybeanGlycine maxt0
- Treatment
- melatonint0
- Outcome
- random-amplified polymorphic DNA polymorphism, 8-hydroxy-20-deoxyguanine content, and relative density of apurinic/apyrimidinic-sitese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased random-amplified polymorphic DNA polymorphism, 8-hydroxy-20-deoxyguanine content, and relative density of apurinic/apyrimidinic-sites.”
t0“Exogenous melatonin mitigates saline‐alkali stress by decreasing DNA oxidative damage and enhancing photosynthetic carbon metabolism in soybean (Glycine max [L.] Merr.) leaves”
Claim · model-written summary
Melatonin increased mesophyll cell volume, chloroplast and starch-grain numbers, and pigment contents in stressed soybean leaves.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- seedling leavese0
- Treatment
- Melatonin treatmente0
- Outcome
- volume of mesophyll cells, the numbers of chloroplast and starch grains, the contents of chlorophyll a and b and carotenoidse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Melatonin treatment also increased the volume of mesophyll cells, the numbers of chloroplast and starch grains, the contents of chlorophyll a and b and carotenoids in soybean seedling leaves treated with SS”
Claim · model-written summary
Melatonin improved light capture, electron transfer, photosynthesis, carbohydrate metabolism, and stress tolerance in soybean.
- Taxon
- soybeanGlycine maxe0
- Treatment
- melatonin treatmente0
- Outcome
- carbohydrate accumulation and metabolism in soybean leaves under SSe0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thereby increasing the efficiency of effective light capture and electron transfer and improving photosynthesis. Subsequently, carbohydrate accumulation and metabolism in soybean leaves under SS were improved by melatonin treatment, which contributes to providing basic substances and energy for cell growth and metabolism, ultimately improving soybean SS tolerance.”
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