Abstract
Abstract Silicon (Si) supplied as sodium silicate (1·8 m m ) clearly decreased symptoms of manganese (Mn) toxicity in Cucumis sativus L. (cv. Chinesische Schlange) grown in nutrient solution with low to elevated Mn concentrations (0·5–1000 µ m ). Despite approximately the same total Mn content in the leaves, plants not treated with Si had higher Mn concentrations in the intercellular washing fluid (IWF) compared with plants treated with Si, especially in the BaCl 2 ‐ and DTPA‐exchangeable fraction of the leaf apoplast. The Mn concentration of the IWF correlated positively with the severity of Mn‐toxicity symptoms and negatively with the Si supply. Furthermore, in Si‐treated plants less Mn was located in the symplast (< 10%) and more Mn was bound to the cell wall (> 90%) compared with non‐Si‐treated plants (about 50% in each compartment). Manganese present in Si‐treated plants is therefore less available and for this reason less toxic than in plants not treated with Si. It is concluded that Si‐mediated tolerance of Mn in C. sativus is a consequence of stronger binding of Mn to cell walls and a lowering of Mn concentration within the symplast. These results support the role of Si as an important beneficial element in plant nutrition.
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Claims 8
Claim · model-written summary
Silicon decreased manganese toxicity symptoms.
- Taxon
- Cucumis sativus L.
Cucumis sativuse0 - Material
- Chinesische Schlangee0
- Treatment
- Silicon (Si) supplied as sodium silicate (1·8 m m )e0
- Outcome
- symptoms of manganese (Mn) toxicitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Silicon (Si) supplied as sodium silicate (1·8 m m ) clearly decreased symptoms of manganese (Mn) toxicity in Cucumis sativus L. (cv. Chinesische Schlange) grown in nutrient solution with low to elevated Mn concentrations (0·5–1000 µ m ).”
Claim · model-written summary
Total leaf Mn content was approximately equal with and without silicon.
Verbatim
e0“Despite approximately the same total Mn content in the leaves, plants not treated with Si had higher Mn concentrations in the intercellular washing fluid (IWF) compared with plants treated with Si”
Claim · model-written summary
Without silicon, Mn in intercellular washing fluid was higher, especially in the exchangeable apoplast fractions.
Verbatim
e0“plants not treated with Si had higher Mn concentrations in the intercellular washing fluid (IWF) compared with plants treated with Si, especially in the BaCl 2 ‐ and DTPA‐exchangeable fraction of the leaf apoplast.”
Claim · model-written summary
IWF Mn concentration was positively correlated with symptom severity.
- Taxon
- Cucumis sativus L.Cucumis sativust0
- Compound
- Mne0
- Outcome
- severity of Mn‐toxicity symptomse0
- Direction
- positivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Mn concentration of the IWF correlated positively with the severity of Mn‐toxicity symptoms”
t0“Cucumis sativus L.”
Claim · model-written summary
IWF Mn concentration was negatively correlated with silicon supply.
- Taxon
- Cucumis sativus L.Cucumis sativust0
- Treatment
- Si supplye0
- Outcome
- Mn concentration of the IWFe0
- Direction
- negativelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Mn concentration of the IWF correlated positively with the severity of Mn‐toxicity symptoms and negatively with the Si supply.”
t0“Cucumis sativus L.”
Claim · model-written summary
Silicon treated plants had less symplastic and more cell wall bound Mn.
Verbatim
e0“in Si‐treated plants less Mn was located in the symplast (< 10%) and more Mn was bound to the cell wall (> 90%) compared with non‐Si‐treated plants (about 50% in each compartment)”
Claim · model-written summary
More Mn was bound to the cell wall under silicon treatment.
Verbatim
e0“more Mn was bound to the cell wall (> 90%) compared with non‐Si‐treated plants (about 50% in each compartment)”
Claim · model-written summary
The authors attribute silicon mediated Mn tolerance to cell wall binding and lower symplastic Mn.
- Taxon
- C. sativusCucumis sativuse0
- Outcome
- tolerance of Mne0
- Qualifier
- stronger binding of Mn to cell walls and a lowering of Mn concentration within the symplaste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si‐mediated tolerance of Mn in C. sativus is a consequence of stronger binding of Mn to cell walls and a lowering of Mn concentration within the symplast.”
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