Abstract
BACKGROUND AND AIMS: Retranslocation of iron (Fe) from source tissues enhances plant tolerance to Fe deficiency. Previous work has shown that silicon (Si) can alleviate Fe deficiency by enhancing acquisition and root to shoot translocation of Fe. Here the role of Si in Fe mobilization in older leaves and the subsequent retranslocation of Fe to young leaves of cucumber (Cucumis sativus) plants growing under Fe-limiting conditions was investigated. METHODS: Iron ((57)Fe or naturally occurring isotopes) was measured in leaves at different positions on plants hydroponically growing with or without Si supply. In parallel, the concentration of the Fe chelator nicotianamine (NA) along with the expression of nicotianamine synthase (NAS) involved in its biosynthesis and the expression of yellow stripe-like (YSL) transcripts mediating Fe-NA transport were also determined. KEY RESULTS: In plants not receiving Si, approximately half of the total Fe content remained in the oldest leaf. In contrast, Si-treated plants showed an almost even Fe distribution among leaves with four different developmental stages, thus providing evidence of enhanced Fe remobilization from source leaves. This Si-stimulated Fe export was paralleled by an increased NA accumulation and expression of the YSL1 transporter for phloem loading/unloading of the Fe-NA complex. CONCLUSIONS: The results suggest that Si enhances remobilization of Fe from older to younger leaves by a more efficient NA-mediated Fe transport via the phloem. In addition, from this and previous work, a model is proposed of how Si acts to improve Fe homeostasis under Fe deficiency in cucumber.
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Claims 6
Claim · model-written summary
Without silicon, approximately half of total iron remained in the oldest leaf.
- Taxon
- cucumber
Cucumis sativuse1 - Organ / stage
- oldest leafe0
- Treatment
- not receiving Sie0
- Outcome
- total Fe contente0
- Value
- approximately halfe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plants not receiving Si, approximately half of the total Fe content remained in the oldest leaf.”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
Silicon treatment produced nearly even iron distribution among leaves at four developmental stages.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Si-treatede0
- Outcome
- Fe distribution among leavese0
- Qualifier
- four different developmental stagese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si-treated plants showed an almost even Fe distribution among leaves with four different developmental stages”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
Silicon enhanced iron remobilization from source leaves.
- Taxon
- cucumberCucumis sativuse2
- Treatment
- Si-treatede1
- Outcome
- Fe remobilization from source leavese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evidence of enhanced Fe remobilization from source leaves”
e1“Si-treated plants”
e2“cucumber (Cucumis sativus)”
Claim · model-written summary
Silicon-stimulated iron export coincided with increased nicotianamine accumulation.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Si-stimulatede0
- Compound
- Fee0
- Outcome
- NA accumulatione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This Si-stimulated Fe export was paralleled by an increased NA accumulation”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
Silicon-stimulated iron export coincided with increased YSL1 transporter expression.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Si-stimulatede0
- Gene
- YSL1 transportere0
- Outcome
- expression of the YSL1 transportere0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This Si-stimulated Fe export was paralleled by an increased NA accumulation and expression of the YSL1 transporter”
e1“cucumber (Cucumis sativus)”
Claim · model-written summary
Authors suggest that silicon enhances iron movement to younger leaves through more efficient nicotianamine-mediated phloem transport.
- Taxon
- cucumberCucumis sativuse1
- Compound
- Fee0
- Outcome
- remobilization of Fe from older to younger leavese0
- Direction
- enhancese0
- Qualifier
- a more efficient NA-mediated Fe transport via the phloeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si enhances remobilization of Fe from older to younger leaves by a more efficient NA-mediated Fe transport via the phloem”
e1“cucumber (Cucumis sativus)”
The same questions in other papers
silicon atom · nutrient: content · Cucumis sativus (cucumber)Positive and negative results
18 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
17 papers more in this group
See all 21 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.