Abstract
BACKGROUND: Tomato is one of the most popular vegetables, and middle tolerance for salt stress. Spermidine (Spd) has an important role in plant defense mechanisms against abiotic stress; however, relatively few data are available regarding Spd in responses of tomato to saline-alkaline stress. The effect of 0.25 mmol/L Spd on some physiological parameters of two tomato cultivars grown in 75 mmol/L saline-alkaline solutions were studied. Two cultivars are cv. Jinpeng chaoguan which is a highly salt-tolerant ecotype and cv. Zhongza No. 9 which is more salt-sensitive ecotype. RESULTS: Saline-alkaline stress upset nitrogen metabolism, induced the antioxidant enzyme activities, and accumulated much more reactive oxygen species (ROS) and osmoregulation substances in two tomato cultivars leaves. Under saline-alkaline stress condition, Spd-treated seedlings accumulated more osmoregulation substances and had greater activities of antioxidative enzymes. Exogenous Spd counteracted the stress-induced increase of contents of malondialdehyde and ammonium, glutamate dehydrogenase activity, and decreased in nitrate, nitrate reductase, nitrite reductase, glutamine synthetase, glutamate synthase, glutamate oxaloacetate transaminase, and glutamate pyruvate transaminase activities. Additionally, the effect of Spd was more significantly in salt-sensitive cultivar 'Zhongza No. 9'. CONCLUSIONS: Overall, exogenous spermidine can attenuate negative effects of saline-alkaline stress on tomato seedlings which effects may depend on the plant species, and even cultivars.
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Claims 8
Claim · model-written summary
Saline-alkaline stress disrupted nitrogen metabolism in both tomato cultivars.
- Taxon
- tomato
Solanum lycopersicume0 - Organ / stage
- leavese0
- Treatment
- Saline-alkaline stresse0
- Outcome
- nitrogen metabolisme0
- Direction
- upsete0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Saline-alkaline stress upset nitrogen metabolism, induced the antioxidant enzyme activities, and accumulated much more reactive oxygen species (ROS) and osmoregulation substances in two tomato cultivars leaves.”
Claim · model-written summary
Saline-alkaline stress induced antioxidant enzyme activities in both tomato cultivars.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- leavese0
- Treatment
- Saline-alkaline stresse0
- Outcome
- antioxidant enzyme activitiese0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Saline-alkaline stress upset nitrogen metabolism, induced the antioxidant enzyme activities, and accumulated much more reactive oxygen species (ROS) and osmoregulation substances in two tomato cultivars leaves.”
Claim · model-written summary
Saline-alkaline stress increased reactive oxygen species and osmoregulation substances in leaves.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- leavese0
- Treatment
- Saline-alkaline stresse0
- Outcome
- reactive oxygen species (ROS) and osmoregulation substancese0
- Direction
- accumulated much moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Saline-alkaline stress upset nitrogen metabolism, induced the antioxidant enzyme activities, and accumulated much more reactive oxygen species (ROS) and osmoregulation substances in two tomato cultivars leaves.”
Claim · model-written summary
Spermidine-treated seedlings accumulated more osmoregulation substances under saline-alkaline stress.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Spd-treatede0
- Outcome
- osmoregulation substancese0
- Direction
- accumulated moree0
- Qualifier
- Under saline-alkaline stress conditione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato seedling”
e0“Under saline-alkaline stress condition, Spd-treated seedlings accumulated more osmoregulation substances and had greater activities of antioxidative enzymes.”
Claim · model-written summary
Spermidine-treated seedlings had greater antioxidant enzyme activities under saline-alkaline stress.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Spd-treatede0
- Outcome
- activities of antioxidative enzymese0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato seedling”
e0“Under saline-alkaline stress condition, Spd-treated seedlings accumulated more osmoregulation substances and had greater activities of antioxidative enzymes.”
Claim · model-written summary
Exogenous spermidine counteracted stress-induced increases in malondialdehyde and ammonium contents and glutamate dehydrogenase activity.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Exogenous Spde0
- Outcome
- contents of malondialdehyde and ammonium, glutamate dehydrogenase activitye0
- Direction
- counteractede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato seedling”
e0“Exogenous Spd counteracted the stress-induced increase of contents of malondialdehyde and ammonium, glutamate dehydrogenase activity”
Claim · model-written summary
Exogenous spermidine counteracted stress-related decreases in nitrate and nitrogen metabolism enzyme activities.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Exogenous Spde1
- Outcome
- nitrate, nitrate reductase, nitrite reductasee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato seedling”
e0“decreased in nitrate, nitrate reductase, nitrite reductase, glutamine synthetase, glutamate synthase, glutamate oxaloacetate transaminase, and glutamate pyruvate transaminase activities”
e1“Exogenous Spd counteracted the stress-induced increase”
Claim · model-written summary
The spermidine effect was more pronounced in salt-sensitive Zhongza No. 9.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- Zhongza No. 9e0
- Outcome
- effect of Spde0
- Direction
- more significantlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato seedling”
e0“the effect of Spd was more significantly in salt-sensitive cultivar 'Zhongza No. 9'”
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