Abstract
ABSTRACT The effects of exogenous silicon (Si) on key growth parameters and mineral nutrients were investigated in maize grown at high zinc (Zn). Four treatments with three replicates were investigated consisting of a control (basal nutrients with 0.05 mM Zn with or without 1.0 mM Si added), 0.5 mM Zn, and 0.5 mM Zn plus 1.0 mM Si. Plants growing with high Zn alone had a lower chlorophyll (Chl.) content, leaf relative water content (RWC) and produced less biomass than the control plants. Proline content and membrane permeability was higher in zinc-treated plants than in untreated controls. Compared with the plants treated with high Zn alone, added Si significantly increased plant growth, chlorophyll content, and RWC and significantly reduced the membrane permeability and proline content. As expected, added high Zn increased leaf and root Zn, but reduced leaf phosphorus (P) and iron (Fe). Added Si reduced Zn concentration and increased Fe in leaves of maize. It can be concluded that improvement in the key growth parameters tested and mineral nutrition status in maize plants grown at high Zn induced by Si addition may protect membrane permeability under high zinc, thus mitigating Zn toxicity and improving the growth of maize plants. The results of the present experiment support the conclusion that Si may be involved in physiological and nutritional changes in plants grown at high Zn.
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Claims 8
Claim · model-written summary
High zinc reduced maize chlorophyll, relative water content and biomass compared with control plants.
- Treatment
- high Zn alonee0
- Outcome
- chlorophyll (Chl.) content, leaf relative water content (RWC) and produced less biomasse0
- Direction
- lowere0
- Comparator
- the control plantse0
Not reportedTaxon
Verbatim
e0“Plants growing with high Zn alone had a lower chlorophyll (Chl.) content, leaf relative water content (RWC) and produced less biomass than the control plants.”
Claim · model-written summary
Zinc treatment increased maize proline content and membrane permeability against controls.
- Treatment
- zinc-treatede0
- Outcome
- Proline content and membrane permeabilitye0
- Direction
- highere0
- Comparator
- untreated controlse0
Not reportedTaxon
Verbatim
e0“Proline content and membrane permeability was higher in zinc-treated plants than in untreated controls.”
Claim · model-written summary
Silicon increased maize growth, chlorophyll and relative water content versus high zinc alone.
- Treatment
- added Sie0
- Outcome
- plant growth, chlorophyll content, and RWCe0
- Direction
- increasede0
- Comparator
- plants treated with high Zn alonee0
Not reportedTaxon
Verbatim
e0“Compared with the plants treated with high Zn alone, added Si significantly increased plant growth, chlorophyll content, and RWC”
Claim · model-written summary
Silicon reduced membrane permeability and proline content versus high zinc alone.
Not reportedTaxonComparator
Verbatim
e0“added Si significantly increased plant growth, chlorophyll content, and RWC and significantly reduced the membrane permeability and proline content.”
Claim · model-written summary
High zinc increased leaf and root zinc content.
Not reportedTaxonComparator
Verbatim
e0“added high Zn increased leaf and root Zn”
Claim · model-written summary
High zinc reduced leaf phosphorus and iron.
Not reportedTaxonTreatmentComparator
Verbatim
e0“reduced leaf phosphorus (P) and iron (Fe).”
Claim · model-written summary
Silicon reduced leaf zinc concentration in maize.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Added Si reduced Zn concentration and increased Fe in leaves of maize.”
Claim · model-written summary
Silicon increased leaf iron in maize.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Added Si reduced Zn concentration and increased Fe in leaves of maize.”
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