Abstract
The application of biostimulants is an effective strategy to enhancing plant growth and bolstering stress resilience. However, our understanding of the effects of polysaccharides from Ulva prolifera (PUP) on plant growth under abiotic stress remains limited. In this study, the effects of 100 mg/L (PUP-1), 300 mg/L (PUP-3), 500 mg/L (PUP-5) of PUP and water (CK) on the tobacco ( Nicotiana tabacum L.) seedling growth in the acidic soil were compared by a microcosm experiment. The results indicated that PUP-1, PUP-3, and PUP-5 significantly increased the fresh weight by 24 %-70 %, respectively, potentially due to elevated levels of carotenoid, chlorophyll a, and chlorophyll b. PUP significantly improved properties and fertility of the acidic soil, such as pH, available potassium (S-AK), available phosphorus (S-AP), sucrase (S-SU), total nitrogen (S-TN), urease (S-UR), and acid phosphatase (S-APA). The abundances of some beneficial bacteria ( Gemmatimonadaceae , Bacillus and Nitrospira ) were enhanced by PUP-3 treatment, which might be associated with the increased pH and nutritional status of the soil. Moreover, the increase in the abundance of functional genes in biosynthesis pathways of carbon metabolism, amino acids, secondary metabolites, and fatty acids also demonstrated the positive effect of PUP amendments. Among them, PUP-3 (300 mg/L) treatment significantly promoted tobacco growth and optimized soil microbial composition, while higher concentrations (PUP-5) did not show further gains. In summary, the applications of PUP showed great potentials in the enhancement of plant growth in the acidic soil, and 300 mg/L is the optimal application concentration of this polysaccharide preparation in tobacco cultivation. • Polysaccharides from Ulva prolifera (PUP) on plant growth in acidic soils were compared. • PUP affected the rhizosphere soil properties and enzyme activities. • PUP had significant effects on Gemmatimonadaceae , Bacillus and Nitrospira abundances. • PUP can be used as a potential soil conditioner.
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Claims 6
Claim · model-written summary
PUP at 100, 300 and 500 mg/L significantly increased tobacco seedling fresh weight by 24 %-70 % compared with water (CK) in acidic soil.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- PUP-1, PUP-3, and PUP-5e1
- Outcome
- fresh weighte1
- Direction
- increasede1
- Value
- 24 %-70 %e1
- Comparator
- water (CK)e0
- Setting
- acidic soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of 100 mg/L (PUP-1), 300 mg/L (PUP-3), 500 mg/L (PUP-5) of PUP and water (CK) on the tobacco ( Nicotiana tabacum L.) seedling growth in the acidic soil”
e1“PUP-1, PUP-3, and PUP-5 significantly increased the fresh weight by 24 %-70 %”
Claim · model-written summary
PUP significantly improved the properties and fertility of the acidic soil (pH, available potassium and phosphorus, sucrase, total nitrogen, urease, acid phosphatase) relative to water (CK).
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- PUPe1
- Outcome
- properties and fertility of the acidic soile1
- Direction
- improvede1
- Comparator
- water (CK)e0
- Setting
- acidic soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of 100 mg/L (PUP-1), 300 mg/L (PUP-3), 500 mg/L (PUP-5) of PUP and water (CK) on the tobacco ( Nicotiana tabacum L.) seedling growth in the acidic soil”
e1“PUP significantly improved properties and fertility of the acidic soil, such as pH, available potassium (S-AK), available phosphorus (S-AP), sucrase (S-SU), total nitrogen (S-TN), urease (S-UR), and acid phosphatase (S-APA)”
Claim · model-written summary
PUP-3 treatment enhanced the abundances of the beneficial bacteria Gemmatimonadaceae, Bacillus and Nitrospira in the tobacco acidic-soil system, possibly associated with increased soil pH and nutritional status.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- PUP-3 treatmente1
- Interactor
- GemmatimonadaceaeGemmatimonadaceaee1other
- Second interactor
- Bacilluse1other
- Outcome
- abundances of some beneficial bacteriae1
- Direction
- enhancede1
- Qualifier
- Nitrospirae1
- Comparator
- water (CK)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of 100 mg/L (PUP-1), 300 mg/L (PUP-3), 500 mg/L (PUP-5) of PUP and water (CK) on the tobacco ( Nicotiana tabacum L.) seedling growth in the acidic soil”
e1“The abundances of some beneficial bacteria ( Gemmatimonadaceae , Bacillus and Nitrospira ) were enhanced by PUP-3 treatment”
Claim · model-written summary
The abundance of functional genes in biosynthesis pathways of carbon metabolism, amino acids, secondary metabolites and fatty acids increased with PUP amendments.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- PUP amendmentse1
- Outcome
- abundance of functional genes in biosynthesis pathways of carbon metabolism, amino acids, secondary metabolites, and fatty acidse1
- Direction
- increasee1
- Comparator
- water (CK)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of 100 mg/L (PUP-1), 300 mg/L (PUP-3), 500 mg/L (PUP-5) of PUP and water (CK) on the tobacco ( Nicotiana tabacum L.) seedling growth in the acidic soil”
e1“the increase in the abundance of functional genes in biosynthesis pathways of carbon metabolism, amino acids, secondary metabolites, and fatty acids also demonstrated the positive effect of PUP amendments”
Claim · model-written summary
The higher concentration PUP-5 did not show further gains in tobacco growth beyond PUP-3 (300 mg/L).
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- higher concentrations (PUP-5)e0
- Outcome
- tobacco growthe0
- Direction
- did not show further gainse0
- Comparator
- PUP-3 (300 mg/L)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PUP-3 (300 mg/L) treatment significantly promoted tobacco growth and optimized soil microbial composition, while higher concentrations (PUP-5) did not show further gains”
Claim · model-written summary
The authors conclude that 300 mg/L is the optimal PUP application concentration in tobacco cultivation.
- Taxon
- tobaccoNicotiana tabacume0
- Outcome
- optimal application concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“300 mg/L is the optimal application concentration of this polysaccharide preparation in tobacco cultivation”
The same questions in other papers
polysaccharide · molecular: expression · Nicotiana tabacum (tobacco)Results agree
1 paper in the same direction as this paper
- positive
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.