Abstract
Developing wheat ( Triticum aestivum L.) ears (grains and glumes) are sites of nitrate reduction. Nitrate reduced by the developing ear was incorporated into grain protein. In a field experiment, when no N was supplied, nitrate reductase (NR) activity ( µ moles NO 2 ‐/g.f.w./hour) in the glumes and grains was not significantly different from that in the flag leaf blade. Application of N significantly enhanced the NR activity of the flag leaf blade but not that of glumes and grains. Total NR activity (NR activity/g.f.w./hour ✕ fresh weight) of the developing ears equalled that of the leaf blades on the main shoot at low N (0 & 90 kg/ha) levels. At high N (180 kg/ha) level the total NR of the leaf blades was significantly higher than that of the developing ears. In detached culm experiments, flag leaf blade as well as glumes responded to nitrate in the medium even when the detached culms were obtained from plants grown at high N (I80 kg/ha) level. This suggested that under field conditions the enzyme, NR, was operating at sub‐optimal levels. The magnitude of response of glumes was lower than that of the flag leaf blade suggesting preferential flow of nitrate towards the leaf blade or translocational barrier to nitrate movement to the ear. NR activity in the grains was neither enhanced by soil N application nor by additional supply of nitrate to the detached culms.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. 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 9
Claim · model-written summary
Developing wheat ears (grains and glumes) are sites of nitrate reduction.
- Taxon
- wheat
Triticum aestivume1 - Organ / stage
- ears (grains and glumes)e1
- Outcome
- nitrate reductione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Developing wheat ( Triticum aestivum L.) ears (grains and glumes) are sites of nitrate reduction”
Claim · model-written summary
Nitrate reduced by the developing ear was incorporated into grain protein.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- developing eare2
- Outcome
- incorporated into grain proteine2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Developing wheat ( Triticum aestivum L.) ears (grains and glumes) are sites of nitrate reduction”
e2“Nitrate reduced by the developing ear was incorporated into grain protein”
Claim · model-written summary
In a field experiment without N supply, NR activity in glumes and grains did not differ from that of the flag leaf blade.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- glumes and grainse4
- Treatment
- no N was suppliede3
- Outcome
- nitrate reductase (NR) activitye5
- Direction
- not significantly differente4
- Comparator
- flag leaf bladee4
- Setting
- field experimente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Developing wheat ( Triticum aestivum L.) ears (grains and glumes) are sites of nitrate reduction”
e3“In a field experiment, when no N was supplied”
e4“in the glumes and grains was not significantly different from that in the flag leaf blade”
e5“nitrate reductase (NR) activity”
Claim · model-written summary
Application of N significantly enhanced NR activity of the flag leaf blade but not that of glumes and grains.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- flag leaf bladee6
- Treatment
- Application of Ne6
- Outcome
- NR activitye6
- Direction
- significantly enhancede6
- Comparator
- glumes and grainse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Developing wheat ( Triticum aestivum L.) ears (grains and glumes) are sites of nitrate reduction”
e6“Application of N significantly enhanced the NR activity of the flag leaf blade but not that of glumes and grains”
Claim · model-written summary
In detached culms, flag leaf blade and glumes both responded to nitrate in the medium.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- flag leaf blade as well as glumese7
- Treatment
- nitrate in the mediume7
- Outcome
- respondede7
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Developing wheat ( Triticum aestivum L.) ears (grains and glumes) are sites of nitrate reduction”
e7“flag leaf blade as well as glumes responded to nitrate in the medium”
Claim · model-written summary
Soil N application did not enhance NR activity in grains, and nor did additional nitrate supply to detached culms.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- grainse2
- Treatment
- soil N applicatione2
- Outcome
- NR activitye2
- Direction
- neither enhancede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Developing wheat ( Triticum aestivum L.) ears (grains and glumes) are sites of nitrate reduction”
e2“NR activity in the grains was neither enhanced by soil N application nor by additional supply of nitrate to the detached culms”
Claim · model-written summary
At high N (180 kg/ha), total NR of the leaf blades was significantly higher than that of the developing ears.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- leaf bladese2
- Treatment
- high N (180 kg/ha)e2
- Outcome
- total NRe2
- Direction
- significantly highere2
- Comparator
- developing earse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Developing wheat ( Triticum aestivum L.) ears (grains and glumes) are sites of nitrate reduction”
e2“At high N (180 kg/ha) level the total NR of the leaf blades was significantly higher than that of the developing ears”
Claim · model-written summary
At low N (0 and 90 kg/ha), total NR activity of the developing ears equalled that of the leaf blades on the main shoot.
- Taxon
- wheatTriticum aestivume1
- Organ / stage
- developing earse3
- Treatment
- low N (0 & 90 kg/ha) levelse3
- Outcome
- Total NR activitye2
- Direction
- equallede3
- Comparator
- leaf blades on the main shoote3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Developing wheat ( Triticum aestivum L.) ears (grains and glumes) are sites of nitrate reduction”
e2“Total NR activity”
e3“of the developing ears equalled that of the leaf blades on the main shoot at low N (0 & 90 kg/ha) levels”
Claim · model-written summary
Under field conditions, NR appeared to operate at sub-optimal levels in the wheat tissues tested.
- Taxon
- wheatTriticum aestivume1
- Outcome
- enzyme, NRe2
- Qualifier
- operating at sub-optimal levelse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Developing wheat ( Triticum aestivum L.) ears (grains and glumes) are sites of nitrate reduction”
e2“This suggested that under field conditions the enzyme, NR, was operating at sub-optimal levels”
The same questions in other papers
nitrogen · physiology: enzyme activity · Triticum aestivum (wheat)Positive and negative results
39 papers in the same direction as this paper · 8 in the opposite direction
- positive
- negative
- no effect
44 papers more in this group
See all 48 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.