Abstract
Phosphorus is a major nutrient acquired by roots via high-affinity inorganic phosphate (Pi) transporters. In this paper, we describe the tissue-specific regulation of tomato (Lycopersicon esculentum L.) Pi-transporter genes by Pi. The encoded peptides of the LePT1 and LePT2 genes belong to a family of 12 membrane-spanning domain proteins and show a high degree of sequence identity to known high-affinity Pi transporters. Both genes are highly expressed in roots, although there is some expression of LePT1 in leaves. Their expression is markedly induced by Pi starvation but not by starvation of nitrogen, potassium, or iron. The transcripts are primarily localized in root epidermis under Pi starvation. Accumulation of LePT1 message was also observed in palisade parenchyma cells of Pi-starved leaves. Our data suggest that the epidermally localized Pi transporters may play a significant role in acquiring the nutrient under natural conditions. Divided root-system studies support the hypothesis that signal(s) for the Pi-starvation response may arise internally because of the changes in cellular concentration of phosphorus.
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Claims 8
Claim · model-written summary
LePT1 and LePT2 peptides belong to a 12 membrane-spanning domain protein family and resemble known Pi transporters.
- Taxon
- Tomato
Solanum lycopersicumt0 - Gene
- LePT1 and LePT2 genese0
- Outcome
- high degree of sequence identitye0
- Comparator
- known high-affinity Pi transporterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The encoded peptides of the LePT1 and LePT2 genes belong to a family of 12 membrane-spanning domain proteins and show a high degree of sequence identity to known high-affinity Pi transporters”
t0“Tomato”
Claim · model-written summary
Both transporter genes were highly expressed in roots, with some LePT1 expression in leaves.
- Taxon
- TomatoSolanum lycopersicumt0
- Organ / stage
- rootse0
- Gene
- LePT1e0
- Outcome
- highly expressed in rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both genes are highly expressed in roots, although there is some expression of LePT1 in leaves”
t0“Tomato”
Claim · model-written summary
Pi starvation markedly induced transporter gene expression.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- Pi starvatione0
- Outcome
- expressione0
- Direction
- inducede0
- Comparator
- starvation of nitrogen, potassium, or irone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Their expression is markedly induced by Pi starvation but not by starvation of nitrogen, potassium, or iron”
t0“Tomato”
Claim · model-written summary
Nitrogen, potassium and iron starvation did not induce transporter expression.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- starvation of nitrogen, potassium, or irone0
- Outcome
- expressione0
- Comparator
- Pi starvatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Their expression is markedly induced by Pi starvation but not by starvation of nitrogen, potassium, or iron”
t0“Tomato”
Claim · model-written summary
Under Pi starvation, transporter transcripts were primarily in root epidermis.
- Taxon
- TomatoSolanum lycopersicumt0
- Organ / stage
- root epidermise0
- Treatment
- Pi starvatione0
- Outcome
- transcriptse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The transcripts are primarily localized in root epidermis under Pi starvation”
t0“Tomato”
Claim · model-written summary
LePT1 message accumulated in palisade parenchyma of Pi-starved leaves.
- Taxon
- TomatoSolanum lycopersicumt0
- Organ / stage
- palisade parenchyma cellse0
- Gene
- LePT1e0
- Outcome
- Accumulation of LePT1 messagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accumulation of LePT1 message was also observed in palisade parenchyma cells of Pi-starved leaves”
t0“Tomato”
Claim · model-written summary
Epidermal Pi transporters may contribute to nutrient acquisition under natural conditions.
- Taxon
- TomatoSolanum lycopersicumt0
- Gene
- Pi transporterse0
- Outcome
- acquiring the nutriente0
- Qualifier
- under natural conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“epidermally localized Pi transporters may play a significant role in acquiring the nutrient under natural conditions”
t0“Tomato”
Claim · model-written summary
Pi starvation signals may arise internally from changes in cellular phosphorus concentration.
- Taxon
- TomatoSolanum lycopersicumt0
- Compound
- phosphoruse0
- Outcome
- Pi-starvation responsee0
- Qualifier
- changes in cellular concentration of phosphoruse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“signal(s) for the Pi-starvation response may arise internally because of the changes in cellular concentration of phosphorus”
t0“Tomato”
The same questions in other papers
iron atom · molecular: expression · Solanum lycopersicum (tomato)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- no effect
potassium · molecular: expression · Solanum lycopersicum (tomato)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- no effect
- no effect
nitrogen · molecular: expression · Solanum lycopersicum (tomato)Positive and negative results
3 papers in the same direction as this paper · 4 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- positive
4 papers more in this group
See all 8 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.