Abstract
Manganese (Mn) is the second most prevalent transition metal in the Earth's crust but its availability is often limited due to rapid oxidation and low mobility of the oxidized forms. Acclimation to low Mn availability was studied in Arabidopsis seedlings subjected to Mn deficiency. As reported here, Mn deficiency caused a thorough change in the arrangement and characteristics of the root epidermal cells. A proportion of the extra hairs formed upon Mn deficiency were located in atrichoblast positions, indicative of a post-embryonic reprogramming of the cell fate acquired during embryogenesis. When plants were grown under a light intensity of >50 micromol m(-2) s(-1) in the presence of manganese root hair elongation was substantially inhibited, whereas Mn-deficient seedlings displayed stimulated root hair development. GeneChip analysis revealed several candidate genes with potential roles in the reprogramming of rhizodermal cells. None of the genes that function in epidermal cell fate specification were affected by Mn deficiency, indicating that the patterning mechanism which controls the differentiation of rhizodermal cells during embryogenesis have been bypassed under Mn-deficient conditions. This assumption is supported by the partial rescue of the hairless cpc mutant by Mn deficiency. Inductively coupled plasma-optical emission spectroscopy (ICP-OES) analysis revealed that, besides the anticipated reduction in Mn concentration, Mn deficiency caused an increase in iron concentration. This increase was associated with a decreased transcript level of the iron transporter IRT1, indicative of a more efficient transport of iron in the absence of Mn.
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Claims 10
Claim · model-written summary
Manganese deficiency changed the arrangement and traits of root epidermal cells.
- Taxon
- Arabidopsis
Arabidopsist0 - Treatment
- Mn deficiencye0
- Outcome
- arrangement and characteristics of the root epidermal cellse0
- Direction
- changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn deficiency caused a thorough change in the arrangement and characteristics of the root epidermal cells”
t0“Arabidopsis”
Claim · model-written summary
Some additional root hairs under Mn deficiency formed in atrichoblast positions.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Mn deficiencye0
- Outcome
- extra hairse0
- Direction
- extrae0
- Qualifier
- atrichoblast positionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A proportion of the extra hairs formed upon Mn deficiency were located in atrichoblast positions”
t0“Arabidopsis”
Claim · model-written summary
At light intensity above 50 micromol m(-2) s(-1), manganese presence inhibited root hair elongation.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- in the presence of manganesee0
- Outcome
- root hair elongatione0
- Direction
- inhibitede0
- Qualifier
- >50 micromol m(-2) s(-1)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When plants were grown under a light intensity of >50 micromol m(-2) s(-1) in the presence of manganese root hair elongation was substantially inhibited”
t0“Arabidopsis”
Claim · model-written summary
Mn-deficient seedlings showed stimulated root hair development.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Mn-deficiente0
- Outcome
- root hair developmente0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn-deficient seedlings displayed stimulated root hair development”
t0“Arabidopsis”
Claim · model-written summary
GeneChip analysis identified candidate genes with potential roles in rhizodermal cell reprogramming.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- candidate genese0
- Qualifier
- potential roles in the reprogramming of rhizodermal cellse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GeneChip analysis revealed several candidate genes with potential roles in the reprogramming of rhizodermal cells”
t0“Arabidopsis”
Claim · model-written summary
Mn deficiency did not affect epidermal cell fate specification genes.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Mn deficiencye0
- Gene
- genes that function in epidermal cell fate specificatione0
- Outcome
- genes that function in epidermal cell fate specificatione0
- Direction
- Nonee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the genes that function in epidermal cell fate specification were affected by Mn deficiency”
t0“Arabidopsis”
Claim · model-written summary
Mn deficiency partially rescued the hairless cpc mutant.
- Taxon
- ArabidopsisArabidopsist0
- Material
- cpc mutante0
- Treatment
- Mn deficiencye0
- Outcome
- hairless cpc mutante0
- Direction
- partial rescuee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the partial rescue of the hairless cpc mutant by Mn deficiency”
t0“Arabidopsis”
Claim · model-written summary
Mn concentration was reduced under Mn deficiency.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Mn deficiencye0
- Outcome
- Mn concentratione0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“besides the anticipated reduction in Mn concentration, Mn deficiency caused an increase in iron concentration”
t0“Arabidopsis”
Claim · model-written summary
Mn deficiency increased iron concentration.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Mn deficiencye0
- Outcome
- iron concentratione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn deficiency caused an increase in iron concentration”
t0“Arabidopsis”
Claim · model-written summary
Increased iron concentration was associated with a decreased IRT1 transcript level.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- IRT1e0
- Outcome
- transcript level of the iron transporter IRT1e0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This increase was associated with a decreased transcript level of the iron transporter IRT1”
t0“Arabidopsis”
The same questions in other papers
manganese atom · growth · ArabidopsisPositive and negative results
1 in the opposite direction
- positive
manganese atom · molecular: expression · ArabidopsisResults agree
2 papers in the same direction as this paper
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- 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.