Abstract
The sodium transport and distribution of sweet pepper (Capsicum annuum L.) under saline conditions were studied after transferring the plants to a sodium-free nutrient solution. Sodium stress up to 60 mM did not affect the growth of sweet pepper, as it appears able to counteract the unfavourable physiological effects of sodium efficiently. Sodium was particularly accumulated in the basal pith cells of the stem and in the root cells, while almost no sodium was directed to the leaves or the fruits. The sodium concentration in the pith cells and xylem sap gradually decreased towards the shoot tip. Removal of sodium from the medium resulted in a 50% release of sodium from the plant after 1 week without affecting the gradient in the pith cells. In contrast, the concentration profile in the xylem sap was completely changed: the sodium concentration in the xylem sap at the stem base was similar to that at the top. Phloem transport was studied in a split root experiment, in which both portions of the roots were exposed to 15 mM NaCl and one part was fed with additional 22NaCl. During continuous exposure to 15 mM NaCl no label was detected in unlabelled root parts. However, after transferring the plants to a sodium-free solution, 22 Na was rapidly released from the unlabelled roots, indicating a downward phloem transport. It was concluded that pith cells, the intermediates between the xylem and phloem, play a decisive role in the recirculation of sodium throughout the plant. Release of sodium from the plants following transfer to a sodium-free solution may be explained by changes in the diffusion resistance for passive sodium efflux from the cells.
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Claims 11
Claim · model-written summary
Sodium stress up to 60 mM does not affect the growth of sweet pepper.
- Taxon
- sweet pepper
Capsicum annuume1 - Treatment
- Sodium stress up to 60 mMe1
- Outcome
- growthe1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sodium transport and distribution of sweet pepper (Capsicum annuum L.)”
e1“Sodium stress up to 60 mM did not affect the growth of sweet pepper”
Claim · model-written summary
Sodium is particularly accumulated in the basal pith cells of the stem and in the root cells of sweet pepper.
- Taxon
- sweet pepperCapsicum annuume0
- Organ / stage
- basal pith cells of the stem and in the root cellse1
- Outcome
- particularly accumulatede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sodium transport and distribution of sweet pepper (Capsicum annuum L.)”
e1“Sodium was particularly accumulated in the basal pith cells of the stem and in the root cells, while almost no sodium was directed to the leaves or the fruits”
Claim · model-written summary
Almost no sodium is directed to the leaves or the fruits of sweet pepper.
- Taxon
- sweet pepperCapsicum annuume0
- Organ / stage
- leaves or the fruitse1
- Outcome
- directed to the leaves or the fruitse1
- Qualifier
- almost no sodiume1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sodium transport and distribution of sweet pepper (Capsicum annuum L.)”
e1“Sodium was particularly accumulated in the basal pith cells of the stem and in the root cells, while almost no sodium was directed to the leaves or the fruits”
Claim · model-written summary
The sodium concentration in the pith cells and xylem sap gradually decreases towards the shoot tip of sweet pepper.
- Taxon
- sweet pepperCapsicum annuume0
- Outcome
- sodium concentration in the pith cells and xylem sape1
- Direction
- gradually decreasede1
- Qualifier
- towards the shoot tipe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sodium transport and distribution of sweet pepper (Capsicum annuum L.)”
e1“The sodium concentration in the pith cells and xylem sap gradually decreased towards the shoot tip”
Claim · model-written summary
Removal of sodium from the medium releases about 50% of the sodium from sweet pepper plants after 1 week.
- Taxon
- sweet pepperCapsicum annuume0
- Treatment
- Removal of sodium from the mediume1
- Outcome
- release of sodium from the plante1
- Direction
- increaseinferrede1
- Value
- 50%e1
- Qualifier
- after 1 weeke1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sodium transport and distribution of sweet pepper (Capsicum annuum L.)”
e1“Removal of sodium from the medium resulted in a 50% release of sodium from the plant after 1 week without affecting the gradient in the pith cells”
Claim · model-written summary
After removal of sodium from the medium, the concentration profile in the xylem sap of sweet pepper is completely changed.
- Taxon
- sweet pepperCapsicum annuume0
- Treatment
- Removal of sodium from the mediume1
- Outcome
- concentration profile in the xylem sape2
- Direction
- completely changede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sodium transport and distribution of sweet pepper (Capsicum annuum L.)”
e1“Removal of sodium from the medium resulted in a 50% release of sodium from the plant after 1 week without affecting the gradient in the pith cells”
e2“In contrast, the concentration profile in the xylem sap was completely changed: the sodium concentration in the xylem sap at the stem base was similar to that at the top”
Claim · model-written summary
After removal of sodium, the xylem sap sodium concentration at the stem base is similar to that at the top of sweet pepper.
- Taxon
- sweet pepperCapsicum annuume0
- Outcome
- sodium concentration in the xylem sap at the stem basee2
- Direction
- no_changeinferrede2
- Comparator
- that at the tope2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sodium transport and distribution of sweet pepper (Capsicum annuum L.)”
e2“In contrast, the concentration profile in the xylem sap was completely changed: the sodium concentration in the xylem sap at the stem base was similar to that at the top”
Claim · model-written summary
During continuous exposure to 15 mM NaCl, no label was detected in unlabelled root parts of sweet pepper.
- Taxon
- sweet pepperCapsicum annuume0
- Outcome
- label was detected in unlabelled root partse1
- Qualifier
- During continuous exposure to 15 mM NaCle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sodium transport and distribution of sweet pepper (Capsicum annuum L.)”
e1“During continuous exposure to 15 mM NaCl no label was detected in unlabelled root parts”
Claim · model-written summary
After transfer to a sodium-free solution, 22Na is rapidly released from the unlabelled roots, indicating downward phloem transport.
- Taxon
- sweet pepperCapsicum annuume0
- Treatment
- transferring the plants to a sodium-free solutione1
- Outcome
- released from the unlabelled rootse1
- Direction
- rapidly releasede1
- Qualifier
- indicating a downward phloem transporte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sodium transport and distribution of sweet pepper (Capsicum annuum L.)”
e1“after transferring the plants to a sodium-free solution, 22 Na was rapidly released from the unlabelled roots, indicating a downward phloem transport”
Claim · model-written summary
The authors conclude that pith cells play a decisive role in the recirculation of sodium throughout sweet pepper plants.
- Taxon
- sweet pepperCapsicum annuume0
- Organ / stage
- pith cellse1
- Outcome
- recirculation of sodium throughout the plante1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sodium transport and distribution of sweet pepper (Capsicum annuum L.)”
e1“It was concluded that pith cells, the intermediates between the xylem and phloem, play a decisive role in the recirculation of sodium throughout the plant”
Claim · model-written summary
Release of sodium from sweet pepper plants after transfer to sodium-free solution may be explained by changes in diffusion resistance for passive sodium efflux.
- Taxon
- sweet pepperCapsicum annuume0
- Outcome
- Release of sodium from the plantse1
- Qualifier
- changes in the diffusion resistance for passive sodium efflux from the cellse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sodium transport and distribution of sweet pepper (Capsicum annuum L.)”
e1“Release of sodium from the plants following transfer to a sodium-free solution may be explained by changes in the diffusion resistance for passive sodium efflux from the cells”
The same questions in other papers
sodium atom · growth · Capsicum annuum (sweet pepper)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 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.