Abstract
Understanding the effects of root Fe deficiency on the uptake and translocation of toxic metals can be important for improving the phytoremediation strategies of polluted soils. The present study investigated how Fe nutritional status affects the uptake and root-to-shoot-translocation of Pb in hydroponically grown seedlings of (Mill.) Swingle. The interactions of Fe deficiency and Pb were assessed by measuring the root Fe(III) reductase activity, carboxylic acids concentration in root exudates, root and shoot biomass, and accumulation of Pb and other metals (Fe, Zn, Mn, and Cu) in roots and leaves of Fe-sufficient (+Fe) and Fe-deficient (-Fe) plants. The results indicate that Fe deficiency induced 18-fold higher Fe(III) reductase activity in roots compared with +Fe plants, which was followed by increased root exudation of citric acid (28.2 ± 1.39 in +Fe and 498 ± 256.4 μmol g DW 2 h in -Fe plants). Iron deficiency also induces a significant decrease of root and shoot dry weight compared with the control +Fe plants, whereas 2-wk Pb (20 μM) treatment did not influence root and shoot growth. Iron-sufficient plants accumulated more Pb (56.8 ± 17.29 μg g) in leaves than -Fe plants (21.5 ± 8.10 μg g). Two weeks of exposure to Pb significantly decreased Fe(III) reductase activity and accumulation of Fe, Zn, and Mn in the roots of -Fe plants. It is hypothesized that 2 wk of root exposure to Pb blocks functioning of a specific Fe transport system activated under Fe deficiency.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Fe deficiency induced 18-fold higher root Fe(III) reductase activity than in Fe-sufficient plants.
- Taxon
- Ailanthus altissima
.jpg?width=60)
Ailanthus altissimust0 - Organ / stage
- rootse0
- Treatment
- Fe deficiencye0
- Outcome
- Fe(III) reductase activitye0
- Direction
- highere0
- Value
- 18-folde0
- Comparator
- +Fe plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Ailanthus altissima”
e0“Fe deficiency induced 18-fold higher Fe(III) reductase activity in roots compared with +Fe plants”
Claim · model-written summary
Root exudation of citric acid increased in Fe-deficient plants relative to +Fe plants.
- Taxon
- Ailanthus altissimaAilanthus altissimust0
- Treatment
- -Fe plantse0
- Outcome
- root exudation of citric acide0
- Direction
- increasede0
- Value
- 498 ± 256.4 μmol g DW 2 he0
- Qualifier
- 28.2 ± 1.39 in +Fee0
- Comparator
- +Fee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ailanthus altissima”
e0“increased root exudation of citric acid (28.2 ± 1.39 in +Fe and 498 ± 256.4 μmol g DW 2 h in -Fe plants)”
Claim · model-written summary
Iron deficiency significantly decreased root and shoot dry weight compared with control +Fe plants.
- Taxon
- Ailanthus altissimaAilanthus altissimust0
- Treatment
- Iron deficiencye0
- Outcome
- root and shoot dry weighte0
- Direction
- decreasee0
- Comparator
- control +Fe plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ailanthus altissima”
e0“Iron deficiency also induces a significant decrease of root and shoot dry weight compared with the control +Fe plants”
Claim · model-written summary
A 2-week Pb (20 μM) treatment did not influence root and shoot growth.
- Taxon
- Ailanthus altissimaAilanthus altissimust0
- Treatment
- 2-wk Pb (20 μM) treatmente0
- Outcome
- root and shoot growthe0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ailanthus altissima”
e0“2-wk Pb (20 μM) treatment did not influence root and shoot growth”
Claim · model-written summary
Iron-sufficient plants accumulated more Pb in leaves than Fe-deficient plants.
- Taxon
- Ailanthus altissimaAilanthus altissimust0
- Organ / stage
- leavese0
- Treatment
- Iron-sufficient plantse0
- Outcome
- Pbe0
- Direction
- moree0
- Value
- 56.8 ± 17.29 μg ge0
- Qualifier
- 21.5 ± 8.10 μg ge0
- Comparator
- -Fe plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ailanthus altissima”
e0“Iron-sufficient plants accumulated more Pb (56.8 ± 17.29 μg g) in leaves than -Fe plants (21.5 ± 8.10 μg g)”
Claim · model-written summary
Two weeks of Pb exposure significantly decreased Fe(III) reductase activity in the roots of Fe-deficient plants.
- Taxon
- Ailanthus altissimaAilanthus altissimust0
- Organ / stage
- rootse0
- Treatment
- Two weeks of exposure to Pbe0
- Outcome
- Fe(III) reductase activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ailanthus altissima”
e0“Two weeks of exposure to Pb significantly decreased Fe(III) reductase activity and accumulation of Fe, Zn, and Mn in the roots of -Fe plants”
Claim · model-written summary
Two weeks of Pb exposure significantly decreased accumulation of Fe, Zn and Mn in the roots of Fe-deficient plants.
- Taxon
- Ailanthus altissimaAilanthus altissimust0
- Organ / stage
- rootse0
- Treatment
- Two weeks of exposure to Pbe0
- Outcome
- accumulation of Fe, Zn, and Mne0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ailanthus altissima”
e0“Two weeks of exposure to Pb significantly decreased Fe(III) reductase activity and accumulation of Fe, Zn, and Mn in the roots of -Fe plants”
Claim · model-written summary
The authors hypothesize that root exposure to Pb for 2 weeks blocks the functioning of a specific Fe transport system activated under Fe deficiency.
- Taxon
- Ailanthus altissimaAilanthus altissimust0
- Treatment
- root exposure to Pbe0
- Outcome
- functioning of a specific Fe transport systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Ailanthus altissima”
e0“It is hypothesized that 2 wk of root exposure to Pb blocks functioning of a specific Fe transport system activated under Fe deficiency”
The same questions in other papers
lead atom · growth · Ailanthus altissimus (tree-of-heaven)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
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.