Abstract
Iron deficiency stress causes a severe reduction in plant growth. Although Fe deficiency causes an imbalance in divalent heavy metal nutrients, the mechanisms underlying the growth reduction caused by this imbalance remain unclear. We investigated Zn uptake and accumulation in maize under Fe-deficient conditions. Under Fe-deficient conditions, Zn uptake was 15-fold higher and Zn accumulation was 16-fold higher than that under normal nutrient conditions. The Zn content of maize leaves under Fe-deficient conditions was>0.4 mg g−1 dry weight, which was higher than the content of plants grown in a nutrient solution containing 50 μM ZnCl2. Plant growth under conditions of both Fe and Zn deficiency was significantly higher than that under only Fe-deficient conditions. Moreover, Fe deficiency increased the thiol content of the plant. These results indicate that Fe deficiency causes excess uptake and accumulation of Zn, and that the stress resulting from the Zn overload accelerates growth reduction in maize. Key words: iron deficiency, maize, thiol content, xylem sap, zinc excess.
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Claims 6
Claim · model-written summary
Zn uptake in maize under Fe-deficient conditions was 15-fold higher than under normal nutrient conditions.
- Treatment
- Fe-deficient conditionse0
- Outcome
- Zn uptakee0
- Direction
- highere0
- Value
- 15-folde0
- Comparator
- normal nutrient conditionse0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under Fe-deficient conditions, Zn uptake was 15-fold higher and Zn accumulation was 16-fold higher than that under normal nutrient conditions”
t0“Zea mays”
Claim · model-written summary
Zn accumulation in maize under Fe-deficient conditions was 16-fold higher than under normal nutrient conditions.
- Treatment
- Fe-deficient conditionse0
- Outcome
- Zn accumulatione0
- Direction
- highere0
- Value
- 16-folde0
- Comparator
- normal nutrient conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under Fe-deficient conditions, Zn uptake was 15-fold higher and Zn accumulation was 16-fold higher than that under normal nutrient conditions”
t0“Zea mays”
Claim · model-written summary
Zn content of maize leaves under Fe deficiency exceeded 0.4 mg g-1 dry weight, higher than in plants grown in nutrient solution with 50 uM ZnCl2.
- Organ / stage
- leavese1
- Treatment
- Fe-deficient conditionse1
- Outcome
- Zn contente1
- Direction
- highere1
- Value
- >0.4 mg g−1 dry weighte1
- Comparator
- plants grown in a nutrient solution containing 50 μM ZnCl2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The Zn content of maize leaves under Fe-deficient conditions was>0.4 mg g−1 dry weight, which was higher than the content of plants grown in a nutrient solution containing 50 μM ZnCl2”
Claim · model-written summary
Maize growth under both Fe and Zn deficiency was significantly higher than under Fe deficiency alone.
- Treatment
- both Fe and Zn deficiencye2
- Outcome
- Plant growthe2
- Direction
- highere2
- Comparator
- only Fe-deficient conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Plant growth under conditions of both Fe and Zn deficiency was significantly higher than that under only Fe-deficient conditions”
t0“Zea mays”
Claim · model-written summary
Fe deficiency increased the thiol content of maize plants.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Fe deficiency increased the thiol content of the plant”
t0“Zea mays”
Claim · model-written summary
The authors conclude that Fe deficiency causes excess Zn uptake and accumulation, and that the resulting Zn overload stress accelerates growth reduction in maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Fe deficiency causes excess uptake and accumulation of Zn, and that the stress resulting from the Zn overload accelerates growth reduction in maize”
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This paper is about lacking the nutrient, so it counts the other way round here.
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