Abstract
ABSTRACT Three rice (Oryza sativa L.) varieties: Caiapó (bred for upland crop), Piauí (a landrace), and IAC-47 (an improved variety) were used to study the effects of nitrogen (N) suppression in plant metabolism. Nitrogen suppression increased root growth in Caiapó plants. This growth was simultaneous with increases in hydrogen (H+)-pyrophosphatase (H+-PPase) and vacuolar H+-ATPase (V-H+-ATPase) activities in the roots of Piauí plants. The SDS-PAGE shows 73, 67, and 53 kDa fractions proteins accumulating in the tonoplast what agrees with the observed activities of H+-PPases and V-H+-ATPases. Piauí and IAC-47 varieties exhibited different responses from one another at the beginning of N-Stress: there was an increase in P-H+-ATPase activity for Piauí and a decrease for IAC-47. Piauí plants had a higher content of nitrate (NO3 −) in roots and sheaths, notwithstanding it mobilized less of this NO3 −-N during this growth period than did IAC-47. These results suggest that Piauí plants are better adapted to nutrient-poor environments.
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Claims 8
Claim · model-written summary
Nitrogen suppression increased root growth in Caiapó rice.
- Taxon
- rice
Oryza sativat0 - Material
- Caiapóe0
- Treatment
- Nitrogen suppressione0
- Outcome
- root growthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen suppression increased root growth in Caiapó plants”
t0“rice”
Claim · model-written summary
Under nitrogen suppression, Piauí root H+-PPase and V-H+-ATPase activities increased.
- Taxon
- riceOryza sativat0
- Material
- Piauíe0
- Organ / stage
- rootse0
- Treatment
- Nitrogen Stresst0
- Outcome
- hydrogen (H+)-pyrophosphatase (H+-PPase) and vacuolar H+-ATPase (V-H+-ATPase) activitiese0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in hydrogen (H+)-pyrophosphatase (H+-PPase) and vacuolar H+-ATPase (V-H+-ATPase) activities in the roots of Piauí plants”
t0“Nitrogen Stress on Proton-Pumping and Nitrogen Metabolism in Rice”
Claim · model-written summary
Tonoplast 73, 67 and 53 kDa protein fractions accumulated.
- Taxon
- riceOryza sativat0
- Organ / stage
- tonoplaste0
- Outcome
- 73, 67, and 53 kDa fractions proteinse0
- Direction
- accumulatinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“73, 67, and 53 kDa fractions proteins accumulating in the tonoplast”
t0“Rice”
Claim · model-written summary
At the start of nitrogen stress, Piauí P-H+-ATPase activity increased.
- Taxon
- riceOryza sativat0
- Material
- Piauíe0
- Outcome
- P-H+-ATPase activitye0
- Direction
- increasee0
- Qualifier
- Piauíe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was an increase in P-H+-ATPase activity for Piauí and a decrease for IAC-47”
t0“Rice”
Claim · model-written summary
At the start of nitrogen stress, IAC-47 P-H+-ATPase activity decreased.
- Taxon
- riceOryza sativat0
- Material
- IAC-47e0
- Outcome
- P-H+-ATPase activitye0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was an increase in P-H+-ATPase activity for Piauí and a decrease for IAC-47”
t0“Rice”
Claim · model-written summary
Piauí had higher nitrate content in roots and sheaths than IAC-47.
- Taxon
- riceOryza sativat0
- Material
- Piauíe0
- Organ / stage
- roots and sheathse0
- Outcome
- content of nitrate (NO3 −)e0
- Direction
- highere0
- Comparator
- IAC-47e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Piauí plants had a higher content of nitrate (NO3 −) in roots and sheaths, notwithstanding it mobilized less of this NO3 −-N during this growth period than did IAC-47”
t0“Rice”
Claim · model-written summary
Piauí mobilized less nitrate nitrogen than IAC-47 during this growth period.
- Taxon
- riceOryza sativat0
- Outcome
- NO3 −-Ne0
- Direction
- lesse0
- Comparator
- IAC-47e0
Not reportedMaterial
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it mobilized less of this NO3 −-N during this growth period than did IAC-47”
t0“Rice”
Claim · model-written summary
The authors interpret Piauí as better adapted to nutrient-poor environments.
- Taxon
- riceOryza sativat0
- Material
- Piauíe0
- Outcome
- better adapted to nutrient-poor environmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Piauí plants are better adapted to nutrient-poor environments”
t0“Rice”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
401 papers in the same direction as this paper · 101 in the opposite direction · 8 reporting no difference from an alternative
- negative
- negative
- negative
507 papers more in this group
See all 511 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.