Abstract
Nitrogen is a key element to control the growth and yield of crops. Fertilizer urea nitrogen (N) 60,45, and 30 kg/hm2 was applied at three different stages, midtillering, panicle initiation, and flowering, of the growth and development of rice plants, respectively. At both midtillering and panicle initiation, the total activity of glutamine synthetase (GS) in rice roots and leaves was incrased remarkably as a result of a large amount of ammonia absorbed by roots. Native-PAGE and activity staining showed that the increase of total activity in rice roots and leaves was due to the synthesis of GSrb in roots and GS2 in leaves and that the activity of GSra in roots and GS1 in leaves remained constant. The results showed that the assimilation of external nitrogen was carried out by GSrb but not GSra in rice roots and that the activitry of GS2 was induced also by the external nitrogen, and that GSrb played main role in meeting the needs of the rapid tillering for nitrogen. At flowering, the activity of GS in rice roots and leaves did not change almost after topdressing. These rssults suggest that the change of GS activity in rice roots may use as a measure of the utilization efficiency of the fertilizer.
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Claims 10
Claim · model-written summary
At midtillering and panicle initiation, nitrogen fertilizer markedly increased total GS activity in rice roots and leaves.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- midtillering and panicle initiatione0
- Treatment
- ammonia absorbed by rootse0
- Outcome
- total activity of glutamine synthetase (GS) in rice roots and leavese0
- Direction
- incrasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At both midtillering and panicle initiation, the total activity of glutamine synthetase (GS) in rice roots and leaves was incrased remarkably as a result of a large amount of ammonia absorbed by roots.”
Claim · model-written summary
Increased root GS activity was attributed to synthesis of GSrb.
- Taxon
- riceOryza sativae0
- Organ / stage
- rootse0
- Gene
- GSrbe0
- Outcome
- increase of total activity in rice rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase of total activity in rice roots and leaves was due to the synthesis of GSrb in roots and GS2 in leaves”
Claim · model-written summary
Increased leaf GS activity was attributed to synthesis of GS2.
- Taxon
- riceOryza sativae0
- Organ / stage
- leavese0
- Gene
- GS2e0
- Outcome
- increase of total activity in rice roots and leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase of total activity in rice roots and leaves was due to the synthesis of GSrb in roots and GS2 in leaves”
Claim · model-written summary
Root GSra activity remained constant.
- Taxon
- riceOryza sativat0
- Gene
- GSrae0
- Outcome
- activity of GSra in rootse0
- Direction
- remained constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activity of GSra in roots and GS1 in leaves remained constant.”
t0“rice”
Claim · model-written summary
Leaf GS1 activity remained constant.
- Taxon
- riceOryza sativat0
- Gene
- GS1e0
- Outcome
- GS1 in leavese0
- Direction
- remained constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activity of GSra in roots and GS1 in leaves remained constant.”
t0“rice”
Claim · model-written summary
GSrb, rather than GSra, assimilated external nitrogen in rice roots.
- Taxon
- riceOryza sativae0
- Organ / stage
- rootse0
- Gene
- GSrbe0
- Outcome
- assimilation of external nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the assimilation of external nitrogen was carried out by GSrb but not GSra in rice roots”
Claim · model-written summary
External nitrogen induced GS2 activity.
- Taxon
- riceOryza sativat0
- Treatment
- external nitrogene0
- Gene
- GS2e0
- Outcome
- activitry of GS2e0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activitry of GS2 was induced also by the external nitrogen”
t0“rice”
Claim · model-written summary
GSrb played a main role in supplying nitrogen for rapid tillering.
- Taxon
- riceOryza sativat0
- Gene
- GSrbe0
- Outcome
- meeting the needs of the rapid tillering for nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GSrb played main role in meeting the needs of the rapid tillering for nitrogen.”
t0“rice”
Claim · model-written summary
At flowering, topdressing left GS activity in rice roots and leaves almost unchanged.
- Taxon
- riceOryza sativae0
- Organ / stage
- floweringe0
- Treatment
- topdressinge0
- Outcome
- activity of GS in rice roots and leavese0
- Direction
- did not change almoste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At flowering, the activity of GS in rice roots and leaves did not change almost after topdressing.”
Claim · model-written summary
The authors suggest root GS activity changes as a measure of fertilizer utilization efficiency.
- Taxon
- riceOryza sativae0
- Outcome
- change of GS activity in rice roots may use as a measure of the utilization efficiency of the fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the change of GS activity in rice roots may use as a measure of the utilization efficiency of the fertilizer.”
The same questions in other papers
ammonia · molecular: metabolites · Oryza sativa (rice)Positive and negative results
2 in the opposite direction
- negative
- negative
fertilization · molecular: metabolites · Oryza sativa (rice)Positive and negative results
19 papers in the same direction as this paper · 199 in the opposite direction
- positive
- positive
- positive
215 papers more in this group
See all 219 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.