Abstract
An experiment was conducted to investigate alterations in uptake and assimilation of NO(3) (-) by phosphorus-stressed plants. Young tobacco plants (Nicotiana tabacum [L.], cv NC 2326) growing in solution culture were deprived of an external phosphorus (P) supply for 12 days. On selected days, plants were exposed to (15)NO(3) (-) during the 12 hour light period to determine changes in NO(3) (-) assimilation as the P deficiency progressed. Decreased whole-plant growth was evident after 3 days of P deprivation and became more pronounced with time, but root growth was unaffected until after day 6. Uptake of (15)NO(3) (-) per gram root dry weight and translocation of absorbed (15)NO(3) (-) out of the root were noticeably restricted in -P plants by day 3, and effects on both increased in severity with time. Whole-plant reduction of (15)NO(3) (-) and (15)N incorporation into insoluble reduced-N in the shoot decreased after day 3. Although the P limitation was associated with a substantial accumulation of amino acids in the shoot, there was no indication of excessive accumulation of soluble reduced-(15)N in the shoot during the 12 hour (15)NO(3) (-) exposure periods. The results indicate that alterations in NO(3) (-) transport processes in the root system are the primary initial responses limiting synthesis of shoot protein in P-stressed plants. Elevated amino acid levels evidently are associated with enhanced degradation of protein rather than inhibition of concurrent protein synthesis.
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Claims 8
Claim · model-written summary
Whole-plant growth decreased after 3 days of phosphorus deprivation and the reduction grew with time.
- Taxon
- Nicotiana tabacum
Nicotiana tabacume1 - Material
- NC 2326e1
- Treatment
- P deprivatione0
- Outcome
- whole-plant growthe0
- Direction
- Decreasede0
- Qualifier
- after 3 dayse0
- Setting
- solution culturee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreased whole-plant growth was evident after 3 days of P deprivation and became more pronounced with time”
e1“Young tobacco plants (Nicotiana tabacum [L.], cv NC 2326) growing in solution culture”
Claim · model-written summary
Root growth remained unaffected until after day 6.
- Taxon
- Nicotiana tabacumNicotiana tabacume1
- Treatment
- deprived of an external phosphorus (P) supplye1
- Outcome
- root growthe0
- Direction
- unaffectede0
- Qualifier
- until after day 6e0
- Setting
- solution culturee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth was unaffected until after day 6.”
e1“Young tobacco plants (Nicotiana tabacum [L.], cv NC 2326) growing in solution culture were deprived of an external phosphorus (P) supply for 12 days.”
Claim · model-written summary
Nitrate uptake per root dry weight and translocation out of roots were restricted by day 3 in phosphorus-deprived plants, increasingly with time.
- Taxon
- Nicotiana tabacumNicotiana tabacume1
- Treatment
- -Pe0
- Outcome
- Uptake of (15)NO(3) (-) per gram root dry weight and translocation of absorbed (15)NO(3) (-) out of the roote0
- Direction
- restrictede0
- Qualifier
- by day 3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Uptake of (15)NO(3) (-) per gram root dry weight and translocation of absorbed (15)NO(3) (-) out of the root were noticeably restricted in -P plants by day 3, and effects on both increased in severity with time.”
e1“Young tobacco plants (Nicotiana tabacum [L.], cv NC 2326)”
Claim · model-written summary
Whole-plant nitrate reduction and incorporation of labelled nitrogen into shoot insoluble reduced nitrogen decreased after day 3.
- Taxon
- Nicotiana tabacumNicotiana tabacume1
- Treatment
- deprived of an external phosphorus (P) supplye1
- Outcome
- Whole-plant reduction of (15)NO(3) (-) and (15)N incorporation into insoluble reduced-N in the shoote0
- Direction
- decreasede0
- Qualifier
- after day 3e0
- Setting
- solution culturee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Whole-plant reduction of (15)NO(3) (-) and (15)N incorporation into insoluble reduced-N in the shoot decreased after day 3.”
e1“Young tobacco plants (Nicotiana tabacum [L.], cv NC 2326) growing in solution culture were deprived of an external phosphorus (P) supply for 12 days.”
Claim · model-written summary
Phosphorus limitation was associated with substantial shoot amino acid accumulation.
- Taxon
- Nicotiana tabacumNicotiana tabacume1
- Organ / stage
- shoote0
- Treatment
- P limitatione0
- Outcome
- accumulation of amino acidse0
- Direction
- accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the P limitation was associated with a substantial accumulation of amino acids in the shoot”
e1“Young tobacco plants (Nicotiana tabacum [L.], cv NC 2326)”
Claim · model-written summary
There was no indication of excessive soluble reduced labelled nitrogen accumulation in shoots during 12-hour nitrate exposure.
- Taxon
- Nicotiana tabacumNicotiana tabacume1
- Organ / stage
- shoote0
- Outcome
- no indication of excessive accumulation of soluble reduced-(15)Ne0
- Qualifier
- during the 12 hour (15)NO(3) (-) exposure periodse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no indication of excessive accumulation of soluble reduced-(15)N in the shoot during the 12 hour (15)NO(3) (-) exposure periods.”
e1“Young tobacco plants (Nicotiana tabacum [L.], cv NC 2326)”
Claim · model-written summary
Root nitrate transport alterations were interpreted as the primary initial responses limiting shoot protein synthesis under phosphorus stress.
- Taxon
- Nicotiana tabacumNicotiana tabacume1
- Treatment
- P-stressede0
- Outcome
- synthesis of shoot proteine0
- Qualifier
- alterations in NO(3) (-) transport processes in the root systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicate that alterations in NO(3) (-) transport processes in the root system are the primary initial responses limiting synthesis of shoot protein in P-stressed plants.”
e1“Young tobacco plants (Nicotiana tabacum [L.], cv NC 2326)”
Claim · model-written summary
Elevated amino acid levels were interpreted as associated with enhanced protein degradation rather than inhibited concurrent synthesis.
- Taxon
- Nicotiana tabacumNicotiana tabacume1
- Outcome
- Elevated amino acid levelse0
- Qualifier
- enhanced degradation of protein rather than inhibition of concurrent protein synthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated amino acid levels evidently are associated with enhanced degradation of protein rather than inhibition of concurrent protein synthesis.”
e1“Young tobacco plants (Nicotiana tabacum [L.], cv NC 2326)”
The same questions in other papers
phosphorus · growth · Nicotiana tabacum (tobacco)Positive and negative results
2 papers in the same direction as this paper · 17 in the opposite direction
- positive
- positive
- positive
16 papers more in this group
See all 20 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.