Abstract
It is known that sugar beet, derived from a halophytic wild ancestor, is highly salt-tolerant and that moderate concentrations of NaCl enhance its growth. However, the mechanisms of this improved growth performance by NaCl are not fully understood. In this study, we investigated the effects of NaCl on sugar beet growth under different light conditions and examined the relationship between light-induced oxidative stress and the beneficial effects of NaCl. Sugar beet seedlings in pots filled with fertilized soil were grown with different light intensities (low: 150–250 μmol m−2s−1 or high: 600–1,000 μmol m−2s−1) and NaCl treatments (irrigation with water with or without 50 mM NaCl) for 10 days. The enhanced sugar beet growth by NaCl application was only observed in plants with high light intensity treatments. Moreover, high light intensity treatment increased the shoot concentration of malondialdehyde, an indicator of oxidative stress, while NaCl application decreased it. While there was a positive correlation between Na concentration and the compatible solute glycine betaine in the shoots and roots under both light intensities, a significant negative correlation between the concentrations of glycine betaine and malondialdehyde was found only in the shoots under high light intensity. Because it is known that glycine betaine activates antioxidant enzyme activities and reduces oxidative stress responses, glycine betaine synthesized in response to NaCl accumulation may have reduced the oxidative stress caused by high light intensity in the shoots, which may have caused the enhanced growth in sugar beet. Furthermore, the growth promotion by NaCl accumulation was accompanied by a significant decrease in NO3–N concentration, which suggested that NaCl application affects nitrogen metabolism in sugar beet.
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Claims 8
Claim · model-written summary
NaCl application enhanced sugar beet growth only under high light intensity.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarist0 - Treatment
- NaCl applicatione1
- Outcome
- growthe1
- Direction
- enhancede1
- Qualifier
- only observed in plants with high light intensity treatmentse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet”
e1“The enhanced sugar beet growth by NaCl application was only observed in plants with high light intensity treatments”
Claim · model-written summary
High light intensity increased shoot malondialdehyde concentration in sugar beet.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Organ / stage
- shoote2
- Treatment
- high light intensitye2
- Outcome
- concentration of malondialdehydee2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet”
e2“high light intensity treatment increased the shoot concentration of malondialdehyde, an indicator of oxidative stress, while NaCl application decreased it”
Claim · model-written summary
NaCl application decreased shoot malondialdehyde concentration in sugar beet.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Organ / stage
- shoote2
- Treatment
- NaCl applicatione2
- Outcome
- concentration of malondialdehydee2
- Direction
- decreasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet”
e2“high light intensity treatment increased the shoot concentration of malondialdehyde, an indicator of oxidative stress, while NaCl application decreased it”
Claim · model-written summary
Na concentration was positively correlated with glycine betaine in sugar beet shoots and roots under both light intensities.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Organ / stage
- shoots and rootse3
- Compound
- glycine betainee3
- Outcome
- Na concentratione3
- Direction
- positive correlatione3
- Qualifier
- under both light intensitiese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet”
e3“While there was a positive correlation between Na concentration and the compatible solute glycine betaine in the shoots and roots under both light intensities”
Claim · model-written summary
Glycine betaine and malondialdehyde concentrations were significantly negatively correlated in sugar beet shoots only under high light intensity.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Organ / stage
- shootse4
- Compound
- glycine betainee4
- Outcome
- concentrations of glycine betaine and malondialdehydee4
- Direction
- significant negative correlatione4
- Qualifier
- under high light intensitye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet”
e4“a significant negative correlation between the concentrations of glycine betaine and malondialdehyde was found only in the shoots under high light intensity”
Claim · model-written summary
Glycine betaine synthesized in response to NaCl may have reduced high-light oxidative stress in shoots, possibly causing enhanced growth.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Organ / stage
- shootse5
- Treatment
- NaCl accumulatione5
- Compound
- glycine betainee5
- Outcome
- oxidative stresse5
- Qualifier
- may have reducede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet”
e5“glycine betaine synthesized in response to NaCl accumulation may have reduced the oxidative stress caused by high light intensity in the shoots, which may have caused the enhanced growth in sugar beet”
Claim · model-written summary
NaCl accumulation was accompanied by a significant decrease in NO3–N concentration in sugar beet.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- NaCl accumulatione6
- Outcome
- NO3–N concentratione6
- Direction
- decreasee6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet”
e6“the growth promotion by NaCl accumulation was accompanied by a significant decrease in NO3–N concentration, which suggested that NaCl application affects nitrogen metabolism in sugar beet”
Claim · model-written summary
NaCl application may affect nitrogen metabolism in sugar beet.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- NaCl applicatione6
- Outcome
- nitrogen metabolisme6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet”
e6“the growth promotion by NaCl accumulation was accompanied by a significant decrease in NO3–N concentration, which suggested that NaCl application affects nitrogen metabolism in sugar beet”
The same questions in other papers
sodium chloride · growth · Beta vulgaris (beet)Results differ
9 papers in the same direction as this paper · 10 in the opposite direction
- no effect
- positive
- no effect
16 papers more in this group
See all 20 papers →sodium chloride · physiology: oxidative · Beta vulgaris (beet)Positive and negative results
1 in the opposite direction
- negative
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.