Abstract
Cadmium (Cd) is harmful to plant growth and can be easily transferred from soil to plants. Plant cell wall plays important role in preventing Cd from entering cells. Salicylic acid (SA) mediated defense response increases plant resistance to heavy metals. In this study, all tomato seedlings were pre-treated with 100 μM SA for 3 d, then seedlings were used to analyze the role of SA in regulating plant cell wall resistance to Cd stress. The results showed that exogenous SA significantly reduced Cd accumulation in tomato plants and changed Cd distribution. By analyzing the cell wall composition, it was found cellulose, hemicellulose, pectin, and lignin were induced by SA. Interestingly, the content of Cd in pectin decreased by SA pretreatment, however it was increased in cellulose. Gene expression analysis showed SA up-regulated the expression level of lignin and cellulose synthase genes, but down-regulated the expression of pectin methylesterase related genes. In addition, SA down-regulated the activity of pectin methylesterase. These results indicated that SA pretreatment up-regulated cell wall polysaccharide synthesis and related gene expression to thicken the cell wall and block Cd from passing through. Furthermore, SA decreased pectin methylesterase activity and content to reduce cell wall Cd accumulation and change the Cd partition ratio.
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Claims 10
Claim · model-written summary
Salicylic acid reduced cadmium accumulation in tomato plants.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- exogenous SAe0
- Outcome
- Cd accumulatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous SA significantly reduced Cd accumulation in tomato plants”
Claim · model-written summary
Salicylic acid changed cadmium distribution in tomato.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- SAe0
- Outcome
- Cd distributione0
- Direction
- changede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced Cd accumulation in tomato plants and changed Cd distribution”
Claim · model-written summary
Salicylic acid induced cellulose, hemicellulose, pectin and lignin in tomato cell walls.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SAe0
- Outcome
- cellulose, hemicellulose, pectin, and lignine0
- Direction
- inducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cellulose, hemicellulose, pectin, and lignin were induced by SA”
t0“tomato”
Claim · model-written summary
Salicylic acid pretreatment decreased cadmium content in pectin.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SA pretreatmente0
- Outcome
- content of Cd in pectine0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of Cd in pectin decreased by SA pretreatment”
t0“tomato”
Claim · model-written summary
Salicylic acid pretreatment increased cadmium content in cellulose.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- cellulosee0
- Treatment
- SA pretreatmente0
- Outcome
- content of Cde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of Cd in pectin decreased by SA pretreatment, however it was increased in cellulose”
t0“tomato”
Claim · model-written summary
Salicylic acid up-regulated lignin and cellulose synthase gene expression.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SAe0
- Gene
- lignin and cellulose synthase genese0
- Outcome
- expression levele0
- Direction
- up-regulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SA up-regulated the expression level of lignin and cellulose synthase genes”
t0“tomato”
Claim · model-written summary
Salicylic acid down-regulated pectin methylesterase related gene expression.
- Taxon
- tomatoSolanum lycopersicumt0
- Gene
- pectin methylesterase related genese0
- Outcome
- expression of pectin methylesterase related genese0
- Direction
- down-regulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“down-regulated the expression of pectin methylesterase related genes”
t0“tomato”
Claim · model-written summary
Salicylic acid down-regulated pectin methylesterase activity.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SAe0
- Gene
- pectin methylesterasee0
- Outcome
- activity of pectin methylesterasee0
- Direction
- down-regulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SA down-regulated the activity of pectin methylesterase”
t0“tomato”
Claim · model-written summary
The authors infer that SA-enhanced cell-wall synthesis thickens the wall and blocks cadmium passage.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SA pretreatmente0
- Outcome
- block Cd from passing throughe0
- Qualifier
- thicken the cell walle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SA pretreatment up-regulated cell wall polysaccharide synthesis and related gene expression to thicken the cell wall and block Cd from passing through”
t0“tomato”
Claim · model-written summary
The authors infer that reduced pectin methylesterase activity and content lowers cell-wall cadmium accumulation and changes its partition.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- SAe0
- Gene
- pectin methylesterasee0
- Outcome
- cell wall Cd accumulation and change the Cd partition ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SA decreased pectin methylesterase activity and content to reduce cell wall Cd accumulation and change the Cd partition ratio”
t0“tomato”
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See all 12 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.