Abstract
Deficiency or excess of nitrogen (N) supply can promote formation of reactive oxygen species in plants, inducing oxidative stress.Otherwise, plants may enhance phenolics biosynthesis and antioxidant capacity under N deficiency, but this effect is plant species-dependent.There is no information about influence on phenolics and antioxidant activity in highbush blueberry (Vaccinium corymbosum L.), in which quality and commercial importance depend on high phenolics concentration.We studied the effect of variable N supply (0 to 38 mM) on N uptake and antioxidant responses in two highbush blueberry cultivars (Legacy and Bluegold) hydroponically grown at the long-term.Nitrogen leaves concentration was enhanced for both cultivars at increasing N supply.Bluegold decreased CO 2 assimilation at 0 N treatment, possibly due to both, insufficient N concentration and a decline in superoxide dismutase (SOD) activity.In contrast, SOD was activated in Legacy at 0 N, and interestingly only this cultivar maintained CO 2 assimilation rates across all N treatments.Both cultivars showed higher phenolics and antioxidant activity levels at 9 mM.Despite the differential responses among the cultivars, we propose a threshold of 15 g N kg -1 DW to ensure high antioxidant activity and quality in blueberry leaves.
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Claims 7
Claim · model-written summary
Leaf nitrogen concentration increased with nitrogen supply in both cultivars.
- Taxon
- Vaccinium corymbosum
Vaccinium corymbosumt0 - Material
- both cultivarse0
- Treatment
- increasing N supplye0
- Outcome
- Nitrogen leaves concentratione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vaccinium corymbosum”
e0“Nitrogen leaves concentration was enhanced for both cultivars at increasing N supply.”
Claim · model-written summary
Bluegold CO2 assimilation declined at zero nitrogen.
- Taxon
- Vaccinium corymbosumVaccinium corymbosumt0
- Material
- Bluegolde0
- Treatment
- 0 N treatmente0
- Outcome
- CO 2 assimilatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vaccinium corymbosum”
e0“Bluegold decreased CO 2 assimilation at 0 N treatment, possibly due to both, insufficient N concentration and a decline in superoxide dismutase (SOD) activity.”
Claim · model-written summary
Bluegold superoxide dismutase activity declined at zero nitrogen.
- Taxon
- Vaccinium corymbosumVaccinium corymbosumt0
- Material
- Bluegolde0
- Treatment
- 0 N treatmente0
- Gene
- superoxide dismutase (SOD)e0
- Outcome
- superoxide dismutase (SOD) activitye0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vaccinium corymbosum”
e0“Bluegold decreased CO 2 assimilation at 0 N treatment, possibly due to both, insufficient N concentration and a decline in superoxide dismutase (SOD) activity.”
Claim · model-written summary
Legacy superoxide dismutase was activated at zero nitrogen.
- Taxon
- Vaccinium corymbosumVaccinium corymbosumt0
- Material
- Legacye0
- Treatment
- 0 Ne0
- Gene
- SODe0
- Outcome
- SODe0
- Direction
- activatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vaccinium corymbosum”
e0“SOD was activated in Legacy at 0 N”
Claim · model-written summary
Legacy maintained CO2 assimilation across nitrogen treatments.
- Taxon
- Vaccinium corymbosumVaccinium corymbosumt0
- Outcome
- CO 2 assimilation ratese0
- Direction
- maintainede0
- Qualifier
- across all N treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vaccinium corymbosum”
e0“only this cultivar maintained CO 2 assimilation rates across all N treatments”
Claim · model-written summary
Both cultivars had higher phenolics and antioxidant activity at 9 mM nitrogen.
- Taxon
- Vaccinium corymbosumVaccinium corymbosumt0
- Material
- Both cultivarse0
- Treatment
- 9 mMe0
- Outcome
- phenolics and antioxidant activity levelse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vaccinium corymbosum”
e0“Both cultivars showed higher phenolics and antioxidant activity levels at 9 mM.”
Claim · model-written summary
The authors propose a 15 g N kg -1 DW leaf nitrogen threshold for high antioxidant activity and quality.
- Taxon
- Vaccinium corymbosumVaccinium corymbosumt0
- Outcome
- high antioxidant activity and quality in blueberry leavese0
- Value
- 15 g N kg -1 DWe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vaccinium corymbosum”
e0“we propose a threshold of 15 g N kg -1 DW to ensure high antioxidant activity and quality in blueberry leaves.”
The same questions in other papers
nitrogen · physiology: photosynthesis · Vaccinium corymbosum (highbush blueberry)Positive and negative results
1 in the opposite direction
- positive
nitrogen · molecular: metabolites · Vaccinium corymbosum (highbush blueberry)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- positive
1 paper more in this group
See all 5 papers →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.