Abstract
Salinity stress is a major environmental challenge that adversely impacts the physiological and biochemical processes of pasture, consequently resulting in reduced yields and compromised quality. Biochar amendment has recently emerged as a promising strategy to alleviate the deleterious effects of salinity stress. However, the interactive influences of salinity stress and wheat straw biochar on the physiological, biochemical, and growth characteristics of alfalfa (Medicago sativa L.) remain underexplored. A factorial experiment was conducted using a randomized complete design with five salinity levels (0, 25, 50, 75, and 100 mM NaCl) and three application rates of biochar (0, 25, and 50 g kg−1) to evaluate wheat straw biochar’s potential in alleviating salinity stress in alfalfa. Results showed that salinity stress increased oxidative stress (hydrogen peroxide and malondialdehyde) and reduced chlorophyll fluorescence (maximum quantum efficiency of photosystem II by 1–27%), leading to decreasing photosynthetic parameters, thereby constraining biomass accumulation by 9–77%. Wheat straw biochar amendment under the highest salinity stress, particularly at 25 g kg−1, mitigated oxidative stress by reducing H2O2 and MDA levels by 35% and 33%, respectively, while decreasing the antioxidant enzymes activities of CAT, POD, and SOD by 47%, 42%, and 39%, respectively, compared to the control (non-biochar addition). Concurrently, biochar restored the osmoregulatory substance concentrations of proline and soluble sugar by 59% and 33%, respectively, compared to the control. Furthermore, wheat straw biochar amendment increased the net CO2 assimilation rate by 98%, thereby increasing biomass by 63%. Our study demonstrates that wheat straw biochar can contribute to protecting alfalfa against salinity stress by modulating physiological and biochemical responses. These findings demonstrate that the 25 g kg−1 wheat straw biochar application had the best performance, suggesting this amendment could be a viable strategy for improving alfalfa productivity in salt-affected soils. Future research should explore long-term field applications and the underlying mechanisms of biochar–plant–soil–plant interactions under diverse saline-alkali environments.
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Claims 15
Claim · model-written summary
Salinity stress increased oxidative stress, measured as hydrogen peroxide and malondialdehyde, in alfalfa.
- Taxon
- Alfalfa
Medicago sativat0 - Treatment
- salinity stresse1
- Outcome
- oxidative stress (hydrogen peroxide and malondialdehyde)e1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“salinity stress increased oxidative stress (hydrogen peroxide and malondialdehyde)”
Claim · model-written summary
Salinity stress reduced chlorophyll fluorescence (maximum quantum efficiency of photosystem II) by 1–27% in alfalfa.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- salinity stresse1
- Outcome
- chlorophyll fluorescencee1
- Direction
- reducede1
- Value
- 1–27%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“salinity stress increased oxidative stress (hydrogen peroxide and malondialdehyde) and reduced chlorophyll fluorescence (maximum quantum efficiency of photosystem II by 1–27%)”
Claim · model-written summary
Salinity stress decreased photosynthetic parameters in alfalfa.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- salinity stresse1
- Outcome
- photosynthetic parameterse1
- Direction
- decreasinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“salinity stress increased oxidative stress (hydrogen peroxide and malondialdehyde) and reduced chlorophyll fluorescence (maximum quantum efficiency of photosystem II by 1–27%), leading to decreasing photosynthetic parameters, thereby constraining biomass accumulation by 9–77%”
Claim · model-written summary
Salinity stress constrained biomass accumulation of alfalfa by 9–77%.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- salinity stresse1
- Outcome
- biomass accumulatione1
- Direction
- constraininge1
- Value
- 9–77%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“salinity stress increased oxidative stress (hydrogen peroxide and malondialdehyde) and reduced chlorophyll fluorescence (maximum quantum efficiency of photosystem II by 1–27%), leading to decreasing photosynthetic parameters, thereby constraining biomass accumulation by 9–77%”
Claim · model-written summary
Under the highest salinity, wheat straw biochar (particularly 25 g kg−1) reduced H2O2 levels in alfalfa by 35% compared with the non-biochar control.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Wheat straw biochar amendmente1
- Outcome
- H2O2e1
- Direction
- reducinge1
- Value
- 35%e1
- Qualifier
- under the highest salinity stress, particularly at 25 g kg−1e1
- Comparator
- control (non-biochar addition)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“Wheat straw biochar amendment under the highest salinity stress, particularly at 25 g kg−1, mitigated oxidative stress by reducing H2O2 and MDA levels by 35% and 33%, respectively, while decreasing the antioxidant enzymes activities of CAT, POD, and SOD by 47%, 42%, and 39%, respectively, compared to the control (non-biochar addition)”
Claim · model-written summary
Under the highest salinity, wheat straw biochar (particularly 25 g kg−1) reduced MDA levels in alfalfa by 33% compared with the non-biochar control.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Wheat straw biochar amendmente1
- Outcome
- MDAe1
- Direction
- reducinge1
- Value
- 33%e1
- Qualifier
- under the highest salinity stress, particularly at 25 g kg−1e1
- Comparator
- control (non-biochar addition)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“Wheat straw biochar amendment under the highest salinity stress, particularly at 25 g kg−1, mitigated oxidative stress by reducing H2O2 and MDA levels by 35% and 33%, respectively, while decreasing the antioxidant enzymes activities of CAT, POD, and SOD by 47%, 42%, and 39%, respectively, compared to the control (non-biochar addition)”
Claim · model-written summary
Under the highest salinity, wheat straw biochar decreased CAT antioxidant enzyme activity in alfalfa by 47% compared with the control.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Wheat straw biochar amendmente1
- Outcome
- CATe1
- Direction
- decreasinge1
- Value
- 47%e1
- Qualifier
- under the highest salinity stress, particularly at 25 g kg−1e1
- Comparator
- control (non-biochar addition)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“Wheat straw biochar amendment under the highest salinity stress, particularly at 25 g kg−1, mitigated oxidative stress by reducing H2O2 and MDA levels by 35% and 33%, respectively, while decreasing the antioxidant enzymes activities of CAT, POD, and SOD by 47%, 42%, and 39%, respectively, compared to the control (non-biochar addition)”
Claim · model-written summary
Under the highest salinity, wheat straw biochar decreased POD antioxidant enzyme activity in alfalfa by 42% compared with the control.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Wheat straw biochar amendmente1
- Outcome
- PODe1
- Direction
- decreasinge1
- Value
- 42%e1
- Qualifier
- under the highest salinity stress, particularly at 25 g kg−1e1
- Comparator
- control (non-biochar addition)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“Wheat straw biochar amendment under the highest salinity stress, particularly at 25 g kg−1, mitigated oxidative stress by reducing H2O2 and MDA levels by 35% and 33%, respectively, while decreasing the antioxidant enzymes activities of CAT, POD, and SOD by 47%, 42%, and 39%, respectively, compared to the control (non-biochar addition)”
Claim · model-written summary
Under the highest salinity, wheat straw biochar decreased SOD antioxidant enzyme activity in alfalfa by 39% compared with the control.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- Wheat straw biochar amendmente1
- Outcome
- SODe1
- Direction
- decreasinge1
- Value
- 39%e1
- Qualifier
- under the highest salinity stress, particularly at 25 g kg−1e1
- Comparator
- control (non-biochar addition)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“Wheat straw biochar amendment under the highest salinity stress, particularly at 25 g kg−1, mitigated oxidative stress by reducing H2O2 and MDA levels by 35% and 33%, respectively, while decreasing the antioxidant enzymes activities of CAT, POD, and SOD by 47%, 42%, and 39%, respectively, compared to the control (non-biochar addition)”
Claim · model-written summary
Biochar restored proline concentration in alfalfa by 59% compared with the control.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- biochare1
- Outcome
- prolinee1
- Direction
- restorede1
- Value
- 59%e1
- Comparator
- the controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“biochar restored the osmoregulatory substance concentrations of proline and soluble sugar by 59% and 33%, respectively, compared to the control”
Claim · model-written summary
Biochar restored soluble sugar concentration in alfalfa by 33% compared with the control.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- biochare1
- Outcome
- soluble sugare1
- Direction
- restorede1
- Value
- 33%e1
- Comparator
- the controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“biochar restored the osmoregulatory substance concentrations of proline and soluble sugar by 59% and 33%, respectively, compared to the control”
Claim · model-written summary
Wheat straw biochar amendment increased the net CO2 assimilation rate of alfalfa by 98%.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- wheat straw biochar amendmente1
- Outcome
- net CO2 assimilation ratee1
- Direction
- increasede1
- Value
- 98%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“wheat straw biochar amendment increased the net CO2 assimilation rate by 98%, thereby increasing biomass by 63%”
Claim · model-written summary
Wheat straw biochar amendment increased alfalfa biomass by 63%.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- wheat straw biochar amendmente1
- Outcome
- biomasse1
- Direction
- increasinge1
- Value
- 63%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Alfalfa Seedlings”
e1“wheat straw biochar amendment increased the net CO2 assimilation rate by 98%, thereby increasing biomass by 63%”
Claim · model-written summary
The authors conclude that wheat straw biochar can protect alfalfa against salinity stress by modulating physiological and biochemical responses.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- wheat straw biochare1
- Outcome
- protecting alfalfa against salinity stresse1
- Qualifier
- modulating physiological and biochemical responsese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“wheat straw biochar can contribute to protecting alfalfa against salinity stress by modulating physiological and biochemical responses”
Claim · model-written summary
The authors recommend 25 g kg−1 wheat straw biochar, which performed best, as a viable strategy for improving alfalfa productivity in salt-affected soils.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- 25 g kg−1 wheat straw biochar applicatione1
- Outcome
- improving alfalfa productivitye1
- Setting
- salt-affected soilse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the 25 g kg−1 wheat straw biochar application had the best performance, suggesting this amendment could be a viable strategy for improving alfalfa productivity in salt-affected soils”
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8 of 10 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.