Abstract
In the present study, the roles of foliarly applied 5-aminolevulinic acid (ALA) in photosynthetic parameters, ion contents and expression of several photosynthetic genes were investigated in rapeseed (Brassica napus L.) under well watered and drought conditions. Drought stress reduced relative plant growth rate and leaf water content (RWC), and contents of photosynthetic pigments, starch, soluble proteins and ions in roots. This type of stress, however, stimulated the accumulation of soluble sugars and free amino acids, as well as leaf proline contents. The transcript levels of photosynthetic genes were also down-regulated under drought stress. Exogenously applied ALA partially reduced growth inhibition and increased RWC and chlorophyll contents under drought conditions. The expression of photosynthetic genes was induced by ALA under both normal and drought conditions, which may contribute to an increased photosynthetic capacity. The ALA application further improved the accumulation of hexose and sucrose, accompanied by the maintenance of starch contents in the leaves and possibly relatively higher RWC under drought stress. Based on these results, we suggest that ALA promotes plant growth under drought stress via improving photosynthetic assimilation, increasing chlorophyll content and inducing the expression of several photosynthetic genes.
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Claims 10
Claim · model-written summary
Drought reduced growth rate and leaf water content.
- Taxon
- Brassica napus L.
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- Drought stresse0
- Outcome
- relative plant growth rate and leaf water content (RWC)e0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Drought stress reduced relative plant growth rate and leaf water content (RWC)”
t0“Brassica napus L.”
Claim · model-written summary
Drought reduced photosynthetic pigment, starch, soluble protein and root ion contents.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- Drought stresse0
- Outcome
- contents of photosynthetic pigments, starch, soluble proteins and ions in rootse0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress reduced relative plant growth rate and leaf water content (RWC), and contents of photosynthetic pigments, starch, soluble proteins and ions in roots.”
t0“Brassica napus L.”
Claim · model-written summary
Drought increased soluble sugars, free amino acids and leaf proline.
- Taxon
- Brassica napus L.Brassica napust0
- Outcome
- accumulation of soluble sugars and free amino acids, as well as leaf proline contentse0
- Direction
- stimulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This type of stress, however, stimulated the accumulation of soluble sugars and free amino acids, as well as leaf proline contents.”
t0“Brassica napus L.”
Claim · model-written summary
Drought downregulated photosynthetic gene transcripts.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- drought stresse0
- Gene
- photosynthetic genese0
- Outcome
- transcript levels of photosynthetic genese0
- Direction
- down-regulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The transcript levels of photosynthetic genes were also down-regulated under drought stress.”
t0“Brassica napus L.”
Claim · model-written summary
ALA partially reduced drought-induced growth inhibition.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- Exogenously applied ALAe0
- Outcome
- growth inhibitione0
- Direction
- reducede0
- Qualifier
- under drought conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenously applied ALA partially reduced growth inhibition and increased RWC and chlorophyll contents under drought conditions.”
t0“Brassica napus L.”
Claim · model-written summary
ALA increased RWC and chlorophyll under drought.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- Exogenously applied ALAe0
- Outcome
- RWC and chlorophyll contentse0
- Direction
- increasede0
- Qualifier
- under drought conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenously applied ALA partially reduced growth inhibition and increased RWC and chlorophyll contents under drought conditions.”
t0“Brassica napus L.”
Claim · model-written summary
ALA induced photosynthetic gene expression under normal and drought conditions.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- ALAe0
- Gene
- photosynthetic genese0
- Outcome
- expression of photosynthetic genese0
- Direction
- inducede0
- Qualifier
- under both normal and drought conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The expression of photosynthetic genes was induced by ALA under both normal and drought conditions”
t0“Brassica napus L.”
Claim · model-written summary
ALA improved hexose and sucrose accumulation under drought.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- ALA applicatione0
- Outcome
- accumulation of hexose and sucrosee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ALA application further improved the accumulation of hexose and sucrose, accompanied by the maintenance of starch contents in the leaves and possibly relatively higher RWC under drought stress.”
t0“Brassica napus L.”
Claim · model-written summary
ALA maintained leaf starch content under drought.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- ALA applicatione0
- Outcome
- starch contents in the leavese0
- Direction
- maintenancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ALA application further improved the accumulation of hexose and sucrose, accompanied by the maintenance of starch contents in the leaves and possibly relatively higher RWC under drought stress.”
t0“Brassica napus L.”
Claim · model-written summary
ALA possibly yielded relatively higher RWC under drought.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- ALA applicatione0
- Outcome
- RWCe0
- Direction
- highere0
- Qualifier
- possiblye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ALA application further improved the accumulation of hexose and sucrose, accompanied by the maintenance of starch contents in the leaves and possibly relatively higher RWC under drought stress.”
t0“Brassica napus L.”
The same questions in other papers
5-aminolevulinic acid · molecular: expression · Brassica napus (oilseed rape)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
5-aminolevulinic acid · disease · Brassica napus (oilseed rape)Results agree
1 paper in the same direction as this paper
- positive
5-aminolevulinic acid · molecular: metabolites · Brassica napus (oilseed rape)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.