Abstract
In order to understand the response of nitrate metabolism in seedlings of oilseed rape (Brassica napus L.) to low oxygen stress (LOS), two cultivars were studied at different light, LOS time and exogenous nitrate concentrations under hydroponic stress. Results show that N-uptake and dry matter of rape seedlings were decreased after LOS stress while nitrate accumulation (NA) under LOS was induced by darkness. Nitrate accumulation peaked at 3 d while root activity (RA, defined as dehydrogenase activity) decreased with prolonged waterlogging exposure. Exogenous nitrate significantly elevated NA and RA. Tungstate (TS) and LOS inhibited nitrate reductase (NR) activity while NR transcription and activity were enhanced by exogenous nitrate. Low oxygen stress stimulated the activity of superoxide dismutase (SOD) and peroxidase (POD) slightly, but inhibited that of catalase (CAT). B. napus L. Zhongshuang 10 (ZS10), a LOS tolerant cultivar, displayed smaller decrease upon dry matter under LOS, higher NA in darkness and lower NA in light than B. napus L. Ganlan CC (GAC), a LOS sensitive variety. ZS10 had lower NA and higher RA after waterlogging and exogenous nitrate treatment, and higher NR activity under TS inhibition than GAC, but the activity of antioxidant enzymes did not change under LOS. The results indicate that nitrate metabolism involved tolerance of rape seedlings to LOS, with lower accumulation and higher reduction of nitrate being related to higher LOS tolerance of rape seedlings exposed to waterlogging.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 16
Claim · model-written summary
Low oxygen stress decreased nitrogen uptake and dry matter.
- Taxon
- rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse0 - Treatment
- LOS stresse0
- Outcome
- N-uptake and dry mattere0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“N-uptake and dry matter of rape seedlings were decreased after LOS stress”
Claim · model-written summary
Darkness induced nitrate accumulation under low oxygen stress.
Not reportedTaxonComparator
Verbatim
e0“nitrate accumulation (NA) under LOS was induced by darkness”
Claim · model-written summary
Nitrate accumulation peaked at three days.
Not reportedTaxon
Verbatim
e0“Nitrate accumulation peaked at 3 d”
Claim · model-written summary
Root activity decreased with longer waterlogging exposure.
- Treatment
- waterlogging exposuree0
- Outcome
- root activity (RA, defined as dehydrogenase activity)e0
- Direction
- decreasede0
Not reportedTaxon
Verbatim
e0“root activity (RA, defined as dehydrogenase activity) decreased with prolonged waterlogging exposure”
Claim · model-written summary
Exogenous nitrate significantly increased nitrate accumulation and root activity.
Not reportedTaxonComparator
Verbatim
e0“Exogenous nitrate significantly elevated NA and RA.”
Claim · model-written summary
Tungstate inhibited nitrate reductase activity.
Not reportedTaxonComparator
Verbatim
e0“Tungstate (TS) and LOS inhibited nitrate reductase (NR) activity”
Claim · model-written summary
Low oxygen stress inhibited nitrate reductase activity.
Not reportedTaxonComparator
Verbatim
e0“Tungstate (TS) and LOS inhibited nitrate reductase (NR) activity”
Claim · model-written summary
Exogenous nitrate increased nitrate reductase transcription and activity.
Not reportedTaxonComparator
Verbatim
e0“NR transcription and activity were enhanced by exogenous nitrate”
Claim · model-written summary
Low oxygen stress slightly increased SOD and POD activity.
- Treatment
- Low oxygen stresse0
- Outcome
- activity of superoxide dismutase (SOD) and peroxidase (POD)e0
- Direction
- stimulatede0
Not reportedTaxonComparator
Verbatim
e0“Low oxygen stress stimulated the activity of superoxide dismutase (SOD) and peroxidase (POD) slightly”
Claim · model-written summary
Low oxygen stress inhibited catalase activity.
Not reportedTaxonComparator
Verbatim
e0“Low oxygen stress stimulated the activity of superoxide dismutase (SOD) and peroxidase (POD) slightly, but inhibited that of catalase (CAT).”
Claim · model-written summary
ZS10 lost less dry matter under low oxygen stress than GAC.
Not reportedTaxon
Verbatim
e0“Zhongshuang 10 (ZS10), a LOS tolerant cultivar, displayed smaller decrease upon dry matter under LOS”
Claim · model-written summary
ZS10 had higher nitrate accumulation in darkness and lower accumulation in light than GAC.
- Taxon
- B. napus L.Brassica napuse0
- Material
- Ganlan CC (GAC)e0
- Outcome
- NAe0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher NA in darkness and lower NA in light than B. napus L. Ganlan CC (GAC)”
Claim · model-written summary
ZS10 had lower nitrate accumulation and higher root activity after waterlogging and nitrate treatment than GAC.
Not reportedTaxon
Verbatim
e0“ZS10 had lower NA and higher RA after waterlogging and exogenous nitrate treatment”
Claim · model-written summary
ZS10 had higher nitrate reductase activity under tungstate than GAC.
Not reportedTaxonMaterial
Verbatim
e0“higher NR activity under TS inhibition than GAC”
Claim · model-written summary
Antioxidant enzyme activity did not change under low oxygen stress in ZS10.
Not reportedTaxonComparator
Verbatim
e0“the activity of antioxidant enzymes did not change under LOS”
Claim · model-written summary
Lower nitrate accumulation and higher nitrate reduction were related to greater low oxygen tolerance.
- Taxon
- rapeBrassica napuse0
- Compound
- nitratee0
- Outcome
- LOS tolerancee0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower accumulation and higher reduction of nitrate being related to higher LOS tolerance of rape seedlings exposed to waterlogging”
The same questions in other papers
tungstate · physiology: enzyme activity · Brassica napus (oilseed rape)Results agree
1 paper in the same direction as this paper
- negative
light · nutrient: content · Brassica napus (oilseed rape)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
nitrogen · physiology: enzyme activity · Brassica napus (oilseed rape)Positive and negative results
8 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
7 papers more in this group
See all 11 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.