Abstract
Silicon (Si) is generally considered a beneficial element for the growth of higher plants, especially under stress conditions, but the mechanisms remain unclear. Here, we tested the hypothesis that Si improves salt tolerance through mediating important metabolism processes rather than acting as a mere mechanical barrier. Seedlings of sorghum (Sorghum bicolor L.) growing in hydroponic culture were treated with NaCl (100 mm) combined with or without Si (0.83 mm). The result showed that supplemental Si enhanced sorghum salt tolerance by decreasing Na(+) accumulation. Simultaneously, polyamine (PA) levels were increased and ethylene precursor (1-aminocyclopropane-1-carboxylic acid: ACC) concentrations were decreased. Several key PA synthesis genes were up-regulated by Si under salt stress. To further confirm the role of PA in Si-mediated salt tolerance, seedlings were exposed to spermidine (Spd) or a PA synthesis inhibitor (dicyclohexylammonium sulphate, DCHA) combined with salt and Si. Exogenous Spd showed similar effects as Si under salt stress whereas exogenous DCHA eliminated Si-enhanced salt tolerance and the beneficial effect of Si in decreasing Na(+) accumulation. These results indicate that PAs and ACC are involved in Si-induced salt tolerance in sorghum and provide evidence that Si plays an active role in mediating salt tolerance.
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Claims 8
Claim · model-written summary
Silicon enhanced sorghum salt tolerance.
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplemental Si enhanced sorghum salt tolerance by decreasing Na(+) accumulation”
e1“Seedlings of sorghum (Sorghum bicolor L.) growing in hydroponic culture were treated with NaCl (100 mm) combined with or without Si (0.83 mm)”
Claim · model-written summary
Silicon decreased sodium accumulation in salt stressed sorghum.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplemental Si enhanced sorghum salt tolerance by decreasing Na(+) accumulation”
e1“Seedlings of sorghum (Sorghum bicolor L.) growing in hydroponic culture were treated with NaCl (100 mm) combined with or without Si (0.83 mm)”
Claim · model-written summary
Silicon increased polyamine levels under salt stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Simultaneously, polyamine (PA) levels were increased”
e1“Seedlings of sorghum (Sorghum bicolor L.) growing in hydroponic culture were treated with NaCl (100 mm) combined with or without Si (0.83 mm)”
Claim · model-written summary
Silicon decreased concentrations of the ethylene precursor ACC under salt stress.
- Treatment
- Sie1
- Outcome
- ethylene precursor (1-aminocyclopropane-1-carboxylic acid: ACC) concentrationse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ethylene precursor (1-aminocyclopropane-1-carboxylic acid: ACC) concentrations were decreased”
e1“Seedlings of sorghum (Sorghum bicolor L.) growing in hydroponic culture were treated with NaCl (100 mm) combined with or without Si (0.83 mm)”
Claim · model-written summary
Silicon upregulated key polyamine synthesis genes under salt stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Several key PA synthesis genes were up-regulated by Si under salt stress”
e1“Seedlings of sorghum (Sorghum bicolor L.) growing in hydroponic culture were treated with NaCl (100 mm) combined with or without Si (0.83 mm)”
Claim · model-written summary
Exogenous spermidine produced effects similar to silicon under salt stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous Spd showed similar effects as Si under salt stress”
e1“Seedlings of sorghum (Sorghum bicolor L.) growing in hydroponic culture were treated with NaCl (100 mm) combined with or without Si (0.83 mm)”
Claim · model-written summary
DCHA eliminated silicon-enhanced salt tolerance.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous DCHA eliminated Si-enhanced salt tolerance”
e1“Seedlings of sorghum (Sorghum bicolor L.) growing in hydroponic culture were treated with NaCl (100 mm) combined with or without Si (0.83 mm)”
Claim · model-written summary
DCHA eliminated silicon reduction of sodium accumulation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous DCHA eliminated Si-enhanced salt tolerance and the beneficial effect of Si in decreasing Na(+) accumulation”
e1“Seedlings of sorghum (Sorghum bicolor L.) growing in hydroponic culture were treated with NaCl (100 mm) combined with or without Si (0.83 mm)”
The same questions in other papers
silicon atom · molecular: metabolites · SorghumResults agree
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- positive
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See all 7 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.