Abstract
One of the beneficial effects of silicon (Si) is to improve nutrient imbalance including deficiency and excess of nutrients, however the molecular mechanisms underlying this effect are still poorly understood. In this study, we investigated the interaction between Si and zinc (Zn) in rice by using a mutant ( lsi1 ) defective in Si uptake and its wild‐type (WT, cv. Oochikara) at different Zn levels. High Zn inhibited the root elongation of both WT and lsi1 mutant, but Si did not alleviate this inhibition in both lines. By contrast, Si supply decreased Zn concentration in both the roots and shoots of the WT, but not in the lsi1 mutant. A short‐term (24 h) labeling experiment with stable isotope 67 Zn showed that Si decreased 67 Zn uptake, but did not affect the root‐to‐shoot translocation and distribution ratio to different organs of 67 Zn in the WT. Furthermore, Si accumulated in the shoots, rather than Si in the external solution, is required for suppressing Zn uptake, but this was not caused by Si‐decreased transpiration. A kinetic study showed that Si did not affect K m value of root Zn uptake, but decreased V max value in the WT. Analysis of genes related with Zn transport showed that among ZIP family genes, the expression of only OsZIP1 implicated in Zn uptake, was down‐regulated by Si in the WT, but not in the lsi1 mutant. These results indicate that Si accumulated in the shoots suppresses the Zn uptake through down‐regulating the transporter gene involved in Zn uptake in rice.
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Claims 15
Claim · model-written summary
High zinc inhibited root elongation in wild-type rice.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Zn inhibited the root elongation of both WT and lsi1 mutant, but Si did not alleviate this inhibition in both lines.”
t0“rice”
Claim · model-written summary
High zinc inhibited root elongation in lsi1 rice.
- Taxon
- rice
Oryza sativat0 - Material
- lsi1 mutante0
- Treatment
- High Zne0
- Outcome
- root elongatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Zn inhibited the root elongation of both WT and lsi1 mutant, but Si did not alleviate this inhibition in both lines.”
t0“rice”
Claim · model-written summary
Silicon did not alleviate zinc inhibition of root elongation in wild-type rice.
- Taxon
- riceOryza sativat0
- Material
- WTe0
- Treatment
- Sie0
- Outcome
- root elongatione0
- Direction
- did not alleviatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Zn inhibited the root elongation of both WT and lsi1 mutant, but Si did not alleviate this inhibition in both lines.”
t0“rice”
Claim · model-written summary
Silicon did not alleviate zinc inhibition of root elongation in lsi1 rice.
- Taxon
- riceOryza sativat0
- Material
- lsi1 mutante0
- Treatment
- Sie0
- Outcome
- root elongatione0
- Direction
- did not alleviatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High Zn inhibited the root elongation of both WT and lsi1 mutant, but Si did not alleviate this inhibition in both lines.”
t0“rice”
Claim · model-written summary
Silicon decreased zinc concentration in roots and shoots of wild-type rice.
- Taxon
- riceOryza sativat0
- Material
- WTe0
- Organ / stage
- roots and shootse0
- Treatment
- Si supplye0
- Outcome
- Zn concentratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By contrast, Si supply decreased Zn concentration in both the roots and shoots of the WT, but not in the lsi1 mutant.”
t0“rice”
Claim · model-written summary
Silicon did not decrease zinc concentration in lsi1 rice.
- Taxon
- riceOryza sativat0
- Material
- lsi1 mutante0
- Organ / stage
- roots and shootse0
- Treatment
- Si supplye0
- Outcome
- Zn concentratione0
- Direction
- but note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By contrast, Si supply decreased Zn concentration in both the roots and shoots of the WT, but not in the lsi1 mutant.”
t0“rice”
Claim · model-written summary
Silicon decreased isotope zinc uptake in wild-type rice in a 24-hour experiment.
- Taxon
- riceOryza sativat0
- Material
- WTe0
- Treatment
- Sie0
- Outcome
- 67 Zn uptakee0
- Direction
- decreasede0
- Qualifier
- 24 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A short‐term (24 h) labeling experiment with stable isotope 67 Zn showed that Si decreased 67 Zn uptake, but did not affect the root‐to‐shoot translocation and distribution ratio to different organs of 67 Zn in the WT.”
t0“rice”
Claim · model-written summary
Silicon did not affect zinc translocation or distribution ratios in wild-type rice.
- Taxon
- riceOryza sativat0
- Material
- WTe0
- Treatment
- Sie0
- Outcome
- root‐to‐shoot translocation and distribution ratio to different organs of 67 Zne0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A short‐term (24 h) labeling experiment with stable isotope 67 Zn showed that Si decreased 67 Zn uptake, but did not affect the root‐to‐shoot translocation and distribution ratio to different organs of 67 Zn in the WT.”
t0“rice”
Claim · model-written summary
Shoot silicon accumulation, rather than external silicon, is required for zinc uptake suppression.
- Taxon
- riceOryza sativat0
- Organ / stage
- shootse0
- Compound
- Sie0
- Outcome
- Zn uptakee0
- Direction
- suppressinge0
- Comparator
- Si in the external solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Furthermore, Si accumulated in the shoots, rather than Si in the external solution, is required for suppressing Zn uptake, but this was not caused by Si‐decreased transpiration.”
t0“rice”
Claim · model-written summary
Zinc uptake suppression was not caused by silicon-decreased transpiration.
- Taxon
- riceOryza sativat0
- Outcome
- Zn uptakee0
- Qualifier
- not caused by Si‐decreased transpiratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Furthermore, Si accumulated in the shoots, rather than Si in the external solution, is required for suppressing Zn uptake, but this was not caused by Si‐decreased transpiration.”
t0“rice”
Claim · model-written summary
Silicon did not affect the Km of root zinc uptake in wild-type rice.
- Taxon
- riceOryza sativat0
- Material
- WTe0
- Treatment
- Sie0
- Outcome
- K m value of root Zn uptakee0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A kinetic study showed that Si did not affect K m value of root Zn uptake, but decreased V max value in the WT.”
t0“rice”
Claim · model-written summary
Silicon decreased the Vmax of zinc uptake in wild-type rice.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A kinetic study showed that Si did not affect K m value of root Zn uptake, but decreased V max value in the WT.”
t0“rice”
Claim · model-written summary
Silicon downregulated only OsZIP1 among ZIP-family genes in wild-type rice.
- Taxon
- riceOryza sativat0
- Material
- WTe0
- Treatment
- Sie0
- Gene
- OsZIP1e0
- Outcome
- expressione0
- Direction
- down‐regulatede0
- Qualifier
- among ZIP family genese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analysis of genes related with Zn transport showed that among ZIP family genes, the expression of only OsZIP1 implicated in Zn uptake, was down‐regulated by Si in the WT, but not in the lsi1 mutant.”
t0“rice”
Claim · model-written summary
Silicon did not downregulate OsZIP1 in lsi1 rice.
- Taxon
- riceOryza sativat0
- Material
- lsi1 mutante0
- Treatment
- Sie0
- Gene
- OsZIP1e0
- Outcome
- expressione0
- Direction
- but note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analysis of genes related with Zn transport showed that among ZIP family genes, the expression of only OsZIP1 implicated in Zn uptake, was down‐regulated by Si in the WT, but not in the lsi1 mutant.”
t0“rice”
Claim · model-written summary
Shoot silicon suppresses rice zinc uptake through transporter gene downregulation.
- Taxon
- riceOryza sativae0
- Organ / stage
- shootse0
- Compound
- Sie0
- Outcome
- Zn uptakee0
- Direction
- suppressese0
- Qualifier
- through down‐regulating the transporter gene involved in Zn uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results indicate that Si accumulated in the shoots suppresses the Zn uptake through down‐regulating the transporter gene involved in Zn uptake in rice.”
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