Abstract
spp.) is a tree species considered for the remediation of soil contaminated by metals, including zinc (Zn). To improve poplar's capacity for Zn assimilation and compartmentalization, it is necessary to understand the physiological and biochemical mechanisms that enable these features as well as their regulation at the molecular level. We observed that the molecular response of poplar roots to Zn excess overlapped with that activated by hypoxia. Therefore, we tested the effect of Zn excess on hypoxia-sensing components and investigated the consequence of root hypoxia on poplar fitness and Zn accumulation capacity. Our results suggest that high intracellular Zn concentrations mimic iron deficiency and inhibit the activity of the oxygen sensors Plant Cysteine Oxidases, leading to the stabilization and activation of ERF-VII transcription factors, which are key regulators of the molecular response to hypoxia. Remarkably, excess Zn and waterlogging similarly decreased poplar growth and development. Simultaneous excess Zn and waterlogging did not exacerbate these parameters, although Zn uptake was limited. This study unveils the contribution of the oxygen-sensing machinery to the Zn excess response in poplar, which may be exploited to improve Zn tolerance and increase Zn accumulation capacity in plants.
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Claims 8
Claim · model-written summary
The molecular response of poplar roots to excess Zn overlapped with hypoxia.
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“molecular response of poplar roots to Zn excess overlapped with that activated by hypoxia”
Claim · model-written summary
High intracellular Zn mimicked iron deficiency.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high intracellular Zn concentrations mimic iron deficiency”
t0“Poplar”
Claim · model-written summary
High intracellular Zn inhibited Plant Cysteine Oxidase activity.
- Gene
- Plant Cysteine Oxidasese0
- Compound
- Zne0
- Outcome
- activity of the oxygen sensors Plant Cysteine Oxidasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high intracellular Zn concentrations mimic iron deficiency and inhibit the activity of the oxygen sensors Plant Cysteine Oxidases”
t0“Poplar”
Claim · model-written summary
Inhibition of oxygen sensors stabilized and activated ERF-VII transcription factors.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leading to the stabilization and activation of ERF-VII transcription factors”
t0“Poplar”
Claim · model-written summary
Excess Zn decreased poplar growth and development.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excess Zn and waterlogging similarly decreased poplar growth and development”
Claim · model-written summary
Waterlogging decreased poplar growth and development.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excess Zn and waterlogging similarly decreased poplar growth and development”
Claim · model-written summary
Combined excess Zn and waterlogging did not further exacerbate growth and development.
- Treatment
- Simultaneous excess Zn and waterlogginge0
- Outcome
- these parameterse0
- Direction
- did not exacerbatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Simultaneous excess Zn and waterlogging did not exacerbate these parameters”
t0“Poplar”
Claim · model-written summary
Combined excess Zn and waterlogging limited Zn uptake.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Simultaneous excess Zn and waterlogging did not exacerbate these parameters, although Zn uptake was limited”
t0“Poplar”
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flooding · growth · Populus (poplar)Positive and negative results
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- positive
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See all 8 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.