Abstract
Taking the moderate heat-tolerant cucumber cultivar 'Jinchun 4' as test material,a quartz sand culture experiment was conducted in a growth chamber to investigate the effects of exogenous spermidine(Spd) on the nitrogen metabolism of cucumber seedlings under high temperature(42 ℃) stress.Short term high temperature stress,especially within 4 hours,decreased the plant nitrate N content while increased the plant ammonium N content,whereas pretreated with exogenous Spd increased the plant nitrate N and ammonium N contents and nitrate reductase(NR) activity.Longer term high temperature stress increased the root nitrate N content but blocked the nitrate N translocation to shoot,deactivated root NR activity,and increased the ammonium N content in root and leaf significantly.Foliar spraying Spd under high temperature stress promoted the nitrate N translocation from root to shoot,and increased the NR activity in root and leaf.From the viewpoint of long-term effect,exogenous Spd could have the effects of preventing the excessive accumulation of ammonium N in cucumber seedlings,and of promoting the normalization of the nitrogen metabolism of cucumber seedlings under high temperature stress.
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Claims 11
Claim · model-written summary
Short heat exposure decreased plant nitrate nitrogen content.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- high temperature stresse0
- Outcome
- plant nitrate N contente0
- Direction
- decreasede0
- Qualifier
- within 4 hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber”
e0“Short term high temperature stress,especially within 4 hours,decreased the plant nitrate N content”
Claim · model-written summary
Short heat exposure increased plant ammonium nitrogen content.
- Taxon
- cucumberCucumis sativust0
- Treatment
- high temperature stresse0
- Outcome
- plant ammonium N contente0
- Direction
- increasede0
- Qualifier
- within 4 hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber”
e0“Short term high temperature stress,especially within 4 hours,decreased the plant nitrate N content while increased the plant ammonium N content”
Claim · model-written summary
Spermidine pretreatment raised plant nitrate and ammonium nitrogen contents under heat.
- Taxon
- cucumberCucumis sativust0
- Treatment
- exogenous Spde0
- Outcome
- plant nitrate N and ammonium N contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber”
e0“pretreated with exogenous Spd increased the plant nitrate N and ammonium N contents and nitrate reductase(NR) activity”
Claim · model-written summary
Spermidine pretreatment raised nitrate reductase activity under heat.
- Taxon
- cucumberCucumis sativust0
- Treatment
- exogenous Spde0
- Gene
- nitrate reductase(NR)e0
- Outcome
- nitrate reductase(NR) activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber”
e0“pretreated with exogenous Spd increased the plant nitrate N and ammonium N contents and nitrate reductase(NR) activity”
Claim · model-written summary
Longer heat stress increased root nitrate nitrogen content.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- roote0
- Treatment
- high temperature stresse0
- Outcome
- root nitrate N contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber”
e0“Longer term high temperature stress increased the root nitrate N content”
Claim · model-written summary
Longer heat stress blocked nitrate nitrogen translocation from root to shoot.
- Taxon
- cucumberCucumis sativust0
- Treatment
- high temperature stresse0
- Outcome
- nitrate N translocation to shoote0
- Direction
- blockede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber”
e0“Longer term high temperature stress increased the root nitrate N content but blocked the nitrate N translocation to shoot”
Claim · model-written summary
Longer heat stress deactivated root nitrate reductase activity.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- roote0
- Treatment
- high temperature stresse1
- Gene
- NRe0
- Outcome
- root NR activitye0
- Direction
- deactivatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber”
e0“deactivated root NR activity”
e1“Longer term high temperature stress”
Claim · model-written summary
Longer heat stress significantly increased ammonium nitrogen in roots and leaves.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- root and leafe0
- Treatment
- high temperature stresse0
- Outcome
- ammonium N content in root and leafe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber”
e0“Longer term high temperature stress increased the root nitrate N content but blocked the nitrate N translocation to shoot,deactivated root NR activity,and increased the ammonium N content in root and leaf significantly”
Claim · model-written summary
Foliar spermidine under heat promoted nitrate translocation from root to shoot.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Foliar spraying Spde0
- Outcome
- nitrate N translocation from root to shoote0
- Direction
- promotede0
- Qualifier
- high temperature stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber”
e0“Foliar spraying Spd under high temperature stress promoted the nitrate N translocation from root to shoot”
Claim · model-written summary
Foliar spermidine under heat increased root and leaf nitrate reductase activity.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- root and leafe0
- Treatment
- Foliar spraying Spde0
- Gene
- NRe0
- Outcome
- NR activity in root and leafe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber”
e0“Foliar spraying Spd under high temperature stress promoted the nitrate N translocation from root to shoot,and increased the NR activity in root and leaf”
Claim · model-written summary
Authors concluded spermidine could prevent excess ammonium accumulation and normalize nitrogen metabolism under long-term heat.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- exogenous Spde0
- Outcome
- excessive accumulation of ammonium N in cucumber seedlingse0
- Qualifier
- high temperature stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous Spd could have the effects of preventing the excessive accumulation of ammonium N in cucumber seedlings,and of promoting the normalization of the nitrogen metabolism of cucumber seedlings under high temperature stress”
The same questions in other papers
spermidine · nutrient: content · Cucumis sativus (cucumber)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
spermidine · physiology: enzyme activity · Cucumis sativus (cucumber)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
heat · nutrient: content · Cucumis sativus (cucumber)Positive and negative results
1 in the opposite direction
- positive
heat · physiology: enzyme activity · Cucumis sativus (cucumber)Positive and negative results
1 in the opposite direction
- positive
application · nutrient: content · Cucumis sativus (cucumber)Positive and negative results
14 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
16 papers more in this group
See all 20 papers →application · physiology: enzyme activity · Cucumis sativus (cucumber)Results agree
4 papers in the same direction as this paper
- 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.