Abstract
Abstract The role of both acidity release and ferric reduction by scutellum was investigated in relation to iron (Fe) mobilization from endosperm and transport to axis organs (shoot + root) during early seedling development of maize (Zea mays L.). Effect of scutellum zinc (Zn) transfer to growing axis organs was also evaluated. Acidity release and translocation of Fe or Zn from an agar medium to axis organs were decreased when scutellum dorsal sides of intact seedlings were embedded into a pH buffered agar medium. Across genotypes root growth during at least 3 days was correlated to scutellar acidity release. Orthovanadate or pyrazole (1 mM) did not inhibit Fe translocation to axis organs. Thus, Fe translocation was not closely associated with scutellum plasma membrane H+-ATPases or alcohol dehydrogenase. Addition of Fe2+-citrate facilitated Fe translocation from agar medium to axis organs by 20%, compared to FeSO4. Extracellular reduction of Fe2+ to Fe3+ was associated with release of reductants from scutellum, which was dramatically inhibited by low temperature (7°C). This process was not affected by solution pH within range of 3.5–6.5 units or by copper (Cu2+), Zn2+, and manganese (Mn2+) added to assay-solution Fe. Keywords: MaizeGrainIronZincTransportAxis organs
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Claims 9
Claim · model-written summary
Embedding the scutellum dorsal sides of intact maize seedlings in a pH buffered agar medium decreased acidity release and Fe or Zn translocation to axis organs.
- Organ / stage
- scutellume1
- Treatment
- embedded into a pH buffered agar mediume1
- Outcome
- Acidity release and translocation of Fe or Zne1
- Direction
- decreasede1
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early seedling development of maize (Zea mays L.)”
e1“Acidity release and translocation of Fe or Zn from an agar medium to axis organs were decreased when scutellum dorsal sides of intact seedlings were embedded into a pH buffered agar medium”
Claim · model-written summary
Orthovanadate or pyrazole (1 mM) did not inhibit Fe translocation to axis organs in maize.
- Treatment
- Orthovanadate or pyrazole (1 mM)e4
- Outcome
- Fe translocation to axis organse4
- Direction
- did not inhibite4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early seedling development of maize (Zea mays L.)”
e4“Orthovanadate or pyrazole (1 mM) did not inhibit Fe translocation to axis organs”
Claim · model-written summary
Fe translocation was not closely associated with scutellum plasma membrane H+-ATPases in maize.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early seedling development of maize (Zea mays L.)”
e5“Thus, Fe translocation was not closely associated with scutellum plasma membrane H+-ATPases or alcohol dehydrogenase”
Claim · model-written summary
Across maize genotypes, root growth during at least 3 days was correlated with scutellar acidity release.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early seedling development of maize (Zea mays L.)”
e6“Across genotypes root growth during at least 3 days was correlated to scutellar acidity release”
Claim · model-written summary
Adding Fe2+-citrate facilitated Fe translocation to maize axis organs by 20% compared with FeSO4.
- Treatment
- Addition of Fe2+-citratee7
- Outcome
- Fe translocation from agar medium to axis organse7
- Direction
- facilitatede7
- Value
- 20%e7
- Comparator
- FeSO4e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early seedling development of maize (Zea mays L.)”
e7“Addition of Fe2+-citrate facilitated Fe translocation from agar medium to axis organs by 20%, compared to FeSO4”
Claim · model-written summary
Extracellular reduction of Fe2+ to Fe3+ was associated with release of reductants from maize scutellum.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early seedling development of maize (Zea mays L.)”
e2“Extracellular reduction of Fe2+ to Fe3+ was associated with release of reductants from scutellum, which was dramatically inhibited by low temperature (7°C)”
Claim · model-written summary
Low temperature (7°C) dramatically inhibited release of reductants from the maize scutellum.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early seedling development of maize (Zea mays L.)”
e2“Extracellular reduction of Fe2+ to Fe3+ was associated with release of reductants from scutellum, which was dramatically inhibited by low temperature (7°C)”
Claim · model-written summary
Solution pH within 3.5-6.5 did not affect extracellular reduction of Fe2+ to Fe3+ in maize.
- Treatment
- solution pH within range of 3.5–6.5 unitse3
- Outcome
- Extracellular reduction of Fe2+ to Fe3+e2
- Direction
- not affectede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early seedling development of maize (Zea mays L.)”
e2“Extracellular reduction of Fe2+ to Fe3+ was associated with release of reductants from scutellum, which was dramatically inhibited by low temperature (7°C)”
e3“This process was not affected by solution pH within range of 3.5–6.5 units or by copper (Cu2+), Zn2+, and manganese (Mn2+) added to assay-solution Fe”
Claim · model-written summary
Copper, Zn2+ and manganese added to assay-solution Fe did not affect extracellular reduction of Fe2+ to Fe3+ in maize.
- Treatment
- copper (Cu2+), Zn2+, and manganese (Mn2+) added to assay-solution Fee3
- Outcome
- Extracellular reduction of Fe2+ to Fe3+e2
- Direction
- not affectede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early seedling development of maize (Zea mays L.)”
e2“Extracellular reduction of Fe2+ to Fe3+ was associated with release of reductants from scutellum, which was dramatically inhibited by low temperature (7°C)”
e3“This process was not affected by solution pH within range of 3.5–6.5 units or by copper (Cu2+), Zn2+, and manganese (Mn2+) added to assay-solution Fe”
The same questions in other papers
copper atom · nutrient: content · Zea mays (maize)Results differ
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- positive
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1 paper in the same direction as this paper · 1 in the opposite direction
- positive
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manganese atom · nutrient: content · Zea mays (maize)Positive and negative results
1 paper in the same direction as this paper · 14 in the opposite direction
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4 papers in the same direction as this paper · 49 in the opposite direction
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See all 54 papers →copper(2+) · nutrient: content · Zea mays (maize)Results agree
2 papers in the same direction as this paper
- negative
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manganese(2+) · nutrient: content · Zea mays (maize)Results agree
2 papers in the same direction as this paper
- negative
- no effect
in vitro · quality: sugar starch · Zea mays (maize)Positive and negative results
2 in the opposite direction
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ph · nutrient: content · Zea mays (maize)Positive and negative results
7 papers in the same direction as this paper · 12 in the opposite direction
- positive
- positive
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See all 20 papers →8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.