Abstract
Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-). No changes of abscisic acid (ABA) content were found in roots of stressed pea plants 9 d after the beginning of the treatments; however, accumulation of ABA in the leaves was observed. Old leaves accumulated ABA to a higher extent than young leaves. Accumulation of ABA in leaves of ammonium-fed plants and plants grown under low nitrogen supply occurred in the absence of both increased ABA xylem loading rate and enhanced aldehyde oxidase (AO, EC 1.2.3.1) activity in roots. Enhanced leaf AO activity was observed in all treatments, with the highest increase in old leaves. Among the three AO isoforms (AO-1, AO-2 and AO-3) detected in extracts of pea leaves, the lowest one AO-3 (highest mobility in the gel) correlated with ABA production and showed the highest increment in response to the treatments. The increase of AO activity detected in leaves after 2 weeks of stress application was less prominent than after 9 d, suggesting a transient enhancement of ABA production following the onset of stress. An increase of ABA xylem loading rate as well as AO root activity 4 d and 9 d after application of the treatments was observed only in salt-treated plants followed by a decrease after 14 d in 100 mM NaCl. Decreased cytokinin (trans-zeatin riboside) delivery rate into the xylem sap was observed in all treatments. The role of abscisic acid and cytokinins as positive and negative growth signals, as well as the involvement of root-generated ABA on ABA accumulation in leaves is discussed.
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Claims 11
Claim · model-written summary
Root ABA content was unchanged in stressed pea plants 9 d after the treatments began.
- Taxon
- Pisum sativum
Lathyrus oleraceuse0 - Organ / stage
- rootse1
- Treatment
- salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)e0
- Outcome
- abscisic acid (ABA) contente1
- Direction
- No changese1
- Qualifier
- 9 d after the beginning of the treatmentse1
- Comparator
- adequate nitrogen supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)”
e1“No changes of abscisic acid (ABA) content were found in roots of stressed pea plants 9 d after the beginning of the treatments”
Claim · model-written summary
ABA accumulated in pea leaves under the salt, ammonium and low nitrogen treatments.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Organ / stage
- leavese2
- Treatment
- salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)e0
- Outcome
- accumulation of ABA in the leavese2
- Direction
- increaseinferrede2
- Comparator
- adequate nitrogen supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)”
e2“accumulation of ABA in the leaves was observed”
Claim · model-written summary
Old pea leaves accumulated more ABA than young leaves.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Organ / stage
- Old leavese3
- Outcome
- accumulated ABAe3
- Direction
- highere3
- Comparator
- young leavese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)”
e3“Old leaves accumulated ABA to a higher extent than young leaves”
Claim · model-written summary
Leaf ABA accumulation in ammonium-fed and low-nitrogen pea plants occurred without increased ABA xylem loading or enhanced root AO activity.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Treatment
- ammonium-fed plants and plants grown under low nitrogen supplye4
- Outcome
- Accumulation of ABA in leavese4
- Qualifier
- in the absence of both increased ABA xylem loading rate and enhanced aldehyde oxidase (AO, EC 1.2.3.1) activity in rootse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)”
e4“Accumulation of ABA in leaves of ammonium-fed plants and plants grown under low nitrogen supply occurred in the absence of both increased ABA xylem loading rate and enhanced aldehyde oxidase (AO, EC 1.2.3.1) activity in roots”
Claim · model-written summary
Leaf aldehyde oxidase activity was enhanced in all treatments, most in old leaves.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Organ / stage
- old leavese5
- Treatment
- all treatmentse5
- Gene
- aldehyde oxidase (AO, EC 1.2.3.1)e4
- Outcome
- leaf AO activitye5
- Direction
- Enhancede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)”
e4“Accumulation of ABA in leaves of ammonium-fed plants and plants grown under low nitrogen supply occurred in the absence of both increased ABA xylem loading rate and enhanced aldehyde oxidase (AO, EC 1.2.3.1) activity in roots”
e5“Enhanced leaf AO activity was observed in all treatments, with the highest increase in old leaves”
Claim · model-written summary
The AO-3 isoform of leaf AO correlated with ABA production.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Gene
- AO-3e6
- Outcome
- ABA productione6
- Direction
- correlatede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)”
e6“the lowest one AO-3 (highest mobility in the gel) correlated with ABA production and showed the highest increment in response to the treatments”
Claim · model-written summary
The AO-3 isoform showed the highest increment in response to the treatments.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Treatment
- the treatmentse6
- Gene
- AO-3e6
- Outcome
- incremente6
- Direction
- higheste6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)”
e6“the lowest one AO-3 (highest mobility in the gel) correlated with ABA production and showed the highest increment in response to the treatments”
Claim · model-written summary
The increase of leaf AO activity after 2 weeks of stress was less prominent than after 9 d.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Organ / stage
- leavese7
- Treatment
- stress applicatione7
- Outcome
- increase of AO activitye7
- Direction
- less prominente7
- Comparator
- after 9 de7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)”
e7“The increase of AO activity detected in leaves after 2 weeks of stress application was less prominent than after 9 d”
Claim · model-written summary
In salt-treated plants, ABA xylem loading rate and root AO activity increased 4 d and 9 d after treatment.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Treatment
- salt-treated plantse7
- Outcome
- ABA xylem loading rate as well as AO root activitye7
- Direction
- increasee7
- Qualifier
- 4 d and 9 d after application of the treatmentse7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)”
e7“An increase of ABA xylem loading rate as well as AO root activity 4 d and 9 d after application of the treatments was observed only in salt-treated plants followed by a decrease after 14 d in 100 mM NaCl”
Claim · model-written summary
ABA xylem loading rate and root AO activity decreased after 14 d in 100 mM NaCl.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Treatment
- 100 mM NaCle7
- Outcome
- ABA xylem loading rate as well as AO root activitye7
- Direction
- decreasee7
- Qualifier
- after 14 d in 100 mM NaCle7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)”
e7“An increase of ABA xylem loading rate as well as AO root activity 4 d and 9 d after application of the treatments was observed only in salt-treated plants followed by a decrease after 14 d in 100 mM NaCl”
Claim · model-written summary
Cytokinin (trans-zeatin riboside) delivery rate into the xylem sap decreased in all treatments.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Treatment
- all treatmentse7
- Outcome
- cytokinin (trans-zeatin riboside) delivery rate into the xylem sape7
- Direction
- Decreasede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea plants (Pisum sativum L.) grown initially in nutrient solutions with adequate nitrogen supply (4 mM NO3-) were transferred to solutions containing salt (50 or 100 mM NaCl), ammonium (4 mM) or a low nitrogen supply (0.4 mM NO3-)”
e7“Decreased cytokinin (trans-zeatin riboside) delivery rate into the xylem sap was observed in all treatments”
The same questions in other papers
nitrogen · physiology: hormones · Lathyrus oleraceus (pea)Results agree
2 papers in the same direction as this paper
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- no effect
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.