Abstract
In order to investigate the effects of root hypoxia (1-2 % oxygen) on the nitrogen (N) metabolism of tomato plants (Solanum lycopersicum L. cv. Micro-Tom), a range of N compounds and N-assimilating enzymes were performed on roots and leaves of plants submitted to root hypoxia at the second leaf stage for three weeks. Obtained results showed that root hypoxia led to a significant decrease in dry weight (DW) production and nitrate content in roots and leaves. Conversely, shoot to root DW ratio and nitrite content were significantly increased. Contrary to that in leaves, glutamine synthetase activity was significantly enhanced in roots. The activities of nitrate and nitrite reductase were enhanced in roots as well as leaves. The higher increase in the NH(4)(+) content and in the protease activities in roots and leaves of hypoxically treated plants coincide with a greater decrease in soluble protein contents. Taken together, these results suggest that root hypoxia leaded to higher protein degradation. The hypoxia-induced increase in the aminating glutamate dehydrogenase activity may be considered as an alternative N assimilation pathway involved in detoxifying the NH(4)(+), accumulated under hypoxic conditions. With respect to hypoxic stress, the distinct sensitivity of the enzymes involved in N assimilation is discussed.
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Claims 10
Claim · model-written summary
Root hypoxia significantly decreased dry weight production and nitrate content in tomato roots and leaves.
- Taxon
- tomato
Solanum lycopersicumt0 - Organ / stage
- roots and leavese1
- Treatment
- root hypoxiae1
- Outcome
- dry weight (DW) production and nitrate contente1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Prolonged root hypoxia effects on enzymes involved in nitrogen assimilation pathway in tomato plants”
e1“Obtained results showed that root hypoxia led to a significant decrease in dry weight (DW) production and nitrate content in roots and leaves”
Claim · model-written summary
Root hypoxia significantly increased shoot to root DW ratio and nitrite content in tomato.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- root hypoxiae1
- Outcome
- shoot to root DW ratio and nitrite contente2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Prolonged root hypoxia effects on enzymes involved in nitrogen assimilation pathway in tomato plants”
e1“Obtained results showed that root hypoxia led to a significant decrease in dry weight (DW) production and nitrate content in roots and leaves”
e2“Conversely, shoot to root DW ratio and nitrite content were significantly increased”
Claim · model-written summary
Root hypoxia significantly enhanced glutamine synthetase activity in tomato roots.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- rootse3
- Treatment
- root hypoxiae1
- Gene
- glutamine synthetasee3
- Outcome
- glutamine synthetase activitye3
- Direction
- enhancede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Prolonged root hypoxia effects on enzymes involved in nitrogen assimilation pathway in tomato plants”
e1“Obtained results showed that root hypoxia led to a significant decrease in dry weight (DW) production and nitrate content in roots and leaves”
e3“glutamine synthetase activity was significantly enhanced in roots”
Claim · model-written summary
Root hypoxia enhanced nitrate and nitrite reductase activities in tomato roots and leaves.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- roots as well as leavese4
- Treatment
- root hypoxiae1
- Gene
- nitrate and nitrite reductasee4
- Outcome
- activities of nitrate and nitrite reductasee4
- Direction
- enhancede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Prolonged root hypoxia effects on enzymes involved in nitrogen assimilation pathway in tomato plants”
e1“Obtained results showed that root hypoxia led to a significant decrease in dry weight (DW) production and nitrate content in roots and leaves”
e4“The activities of nitrate and nitrite reductase were enhanced in roots as well as leaves”
Claim · model-written summary
Root hypoxia gave a higher increase in NH(4)(+) content in tomato roots and leaves.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- roots and leavese5
- Treatment
- root hypoxiae1
- Outcome
- NH(4)(+) contente5
- Direction
- higher increasee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Prolonged root hypoxia effects on enzymes involved in nitrogen assimilation pathway in tomato plants”
e1“Obtained results showed that root hypoxia led to a significant decrease in dry weight (DW) production and nitrate content in roots and leaves”
e5“The higher increase in the NH(4)(+) content and in the protease activities in roots and leaves of hypoxically treated plants coincide with a greater decrease in soluble protein contents”
Claim · model-written summary
Root hypoxia gave a higher increase in protease activities in tomato roots and leaves.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- roots and leavese5
- Treatment
- root hypoxiae1
- Outcome
- protease activitiese5
- Direction
- higher increasee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Prolonged root hypoxia effects on enzymes involved in nitrogen assimilation pathway in tomato plants”
e1“Obtained results showed that root hypoxia led to a significant decrease in dry weight (DW) production and nitrate content in roots and leaves”
e5“The higher increase in the NH(4)(+) content and in the protease activities in roots and leaves of hypoxically treated plants coincide with a greater decrease in soluble protein contents”
Claim · model-written summary
Root hypoxia coincided with a greater decrease in soluble protein contents in tomato.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- root hypoxiae1
- Outcome
- soluble protein contentse5
- Direction
- greater decreasee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Prolonged root hypoxia effects on enzymes involved in nitrogen assimilation pathway in tomato plants”
e1“Obtained results showed that root hypoxia led to a significant decrease in dry weight (DW) production and nitrate content in roots and leaves”
e5“The higher increase in the NH(4)(+) content and in the protease activities in roots and leaves of hypoxically treated plants coincide with a greater decrease in soluble protein contents”
Claim · model-written summary
Root hypoxia led to higher protein degradation in tomato.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- root hypoxiae6
- Outcome
- protein degradatione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Prolonged root hypoxia effects on enzymes involved in nitrogen assimilation pathway in tomato plants”
e6“Taken together, these results suggest that root hypoxia leaded to higher protein degradation”
Claim · model-written summary
Hypoxia increased aminating glutamate dehydrogenase activity in tomato.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- hypoxiae7
- Gene
- aminating glutamate dehydrogenasee7
- Outcome
- aminating glutamate dehydrogenase activitye7
- Direction
- increasee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Prolonged root hypoxia effects on enzymes involved in nitrogen assimilation pathway in tomato plants”
e7“The hypoxia-induced increase in the aminating glutamate dehydrogenase activity may be considered as an alternative N assimilation pathway involved in detoxifying the NH(4)(+), accumulated under hypoxic conditions”
Claim · model-written summary
The hypoxia-induced glutamate dehydrogenase activity may be an alternative N assimilation pathway in tomato that detoxifies NH(4)(+).
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- alternative N assimilation pathwaye7
- Qualifier
- detoxifying the NH(4)(+)e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Prolonged root hypoxia effects on enzymes involved in nitrogen assimilation pathway in tomato plants”
e7“The hypoxia-induced increase in the aminating glutamate dehydrogenase activity may be considered as an alternative N assimilation pathway involved in detoxifying the NH(4)(+), accumulated under hypoxic conditions”
The same questions in other papers
flooding · growth · Solanum lycopersicum (tomato)Results differ
17 papers in the same direction as this paper · 4 in the opposite direction
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