Abstract
Abstract The influence of Co on Fe uptake and the Fe‐stress response mechanism of tomatoes (Lycopersicon esculentum Mill.) and soybeans [Glycine max (L.) Merr.] was studied. Iron‐efficient and ‐inefficient plants (T3238 fer + and T3238 fer tomatoes and A7 and T203 soybeans, respectively) were grown in nutrient solutions for seven and nine days at varying Fe and Co levels (0, 0; 1.0, 0; 1.0, 0.3; 1.0, 0.6; 1.0, 1.2; 1.0, 2.4; and 0, 1.2 mg liter–1 Fe and Co, respectively). Cobalt significantly (p≤0.05) decreased chlorophyll and foliar Fe and increased foliar and root Co in all cultivars. Cobalt effects on root Fe varied among cultivars. The Fe‐inefficient cultivars were most susceptible to chlorosis in the presence of Co, yet apparently exhibited true Fe deficiency. The Fe‐efficient cultivars appeared to exhibit a combination of Fe deficiency and Co toxicity. Chlorophyll formation was generally limited when foliar Fe was below 50 ug Fe g–1 dry weight regardless of Co treatment. Reductant and proton excretion from roots of efficient cultivars apparently did not occur at Co levels where Fe uptake was limiting chlorophyll formation. However, the Fe‐efficient cultivars appeared to remain efficient at low Co levels even though the outward measurable indicators (pH and excreted reductant) were not evident. The Fe‐stress response mechanism was not observed in Fe‐inefficient cultivars regardless of Co level.
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Claims 10
Claim · model-written summary
Cobalt significantly decreased chlorophyll in all tested cultivars.
- Taxon
- tomatoes (Lycopersicon esculentum Mill.) and soybeans [Glycine max (L.) Merr.]
Glycine max
Solanum lycopersicume1 - Treatment
- Cobalte0
- Outcome
- chlorophylle0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cobalt significantly (p≤0.05) decreased chlorophyll and foliar Fe and increased foliar and root Co in all cultivars.”
e1“tomatoes (Lycopersicon esculentum Mill.) and soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Cobalt significantly decreased foliar iron in all tested cultivars.
- Taxon
- tomatoes (Lycopersicon esculentum Mill.) and soybeans [Glycine max (L.) Merr.]Glycine maxSolanum lycopersicume1
- Treatment
- Cobalte0
- Outcome
- foliar Fee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cobalt significantly (p≤0.05) decreased chlorophyll and foliar Fe and increased foliar and root Co in all cultivars.”
e1“tomatoes (Lycopersicon esculentum Mill.) and soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Cobalt significantly increased foliar and root cobalt in all tested cultivars.
- Taxon
- tomatoes (Lycopersicon esculentum Mill.) and soybeans [Glycine max (L.) Merr.]Glycine maxSolanum lycopersicume1
- Treatment
- Cobalte0
- Outcome
- foliar and root Coe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cobalt significantly (p≤0.05) decreased chlorophyll and foliar Fe and increased foliar and root Co in all cultivars.”
e1“tomatoes (Lycopersicon esculentum Mill.) and soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Cobalt effects on root iron varied among cultivars.
- Taxon
- tomatoes (Lycopersicon esculentum Mill.) and soybeans [Glycine max (L.) Merr.]Glycine maxSolanum lycopersicume1
- Treatment
- Cobalte0
- Outcome
- root Fee0
- Direction
- variede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cobalt effects on root Fe varied among cultivars.”
e1“tomatoes (Lycopersicon esculentum Mill.) and soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Iron-inefficient cultivars were most susceptible to chlorosis with cobalt and apparently truly iron deficient.
Not reportedTaxon
Verbatim
e0“The Fe‐inefficient cultivars were most susceptible to chlorosis in the presence of Co, yet apparently exhibited true Fe deficiency.”
Claim · model-written summary
Iron-efficient cultivars appeared to have both iron deficiency and cobalt toxicity.
Not reportedTaxon
Verbatim
e0“The Fe‐efficient cultivars appeared to exhibit a combination of Fe deficiency and Co toxicity.”
Claim · model-written summary
Chlorophyll formation was generally limited below 50 ug Fe g–1 dry weight foliar iron regardless of cobalt treatment.
- Treatment
- Co treatmente0
- Outcome
- Chlorophyll formatione0
- Direction
- limitede0
- Value
- 50 ug Fe g–1 dry weighte0
- Qualifier
- foliar Fee0
Not reportedTaxon
Verbatim
e0“Chlorophyll formation was generally limited when foliar Fe was below 50 ug Fe g–1 dry weight regardless of Co treatment.”
Claim · model-written summary
Efficient cultivars apparently did not excrete reductant or protons at cobalt levels where iron uptake limited chlorophyll formation.
- Material
- efficient cultivarse0
- Treatment
- Co levelse0
- Outcome
- Reductant and proton excretion from rootse0
- Direction
- did not occure0
Not reportedTaxon
Verbatim
e0“Reductant and proton excretion from roots of efficient cultivars apparently did not occur at Co levels where Fe uptake was limiting chlorophyll formation.”
Claim · model-written summary
Iron-efficient cultivars appeared to remain efficient at low cobalt levels despite absent outward indicators.
Not reportedTaxon
Verbatim
e0“the Fe‐efficient cultivars appeared to remain efficient at low Co levels even though the outward measurable indicators (pH and excreted reductant) were not evident.”
Claim · model-written summary
The iron-stress response mechanism was not observed in iron-inefficient cultivars at any cobalt level.
Not reportedTaxon
Verbatim
e0“The Fe‐stress response mechanism was not observed in Fe‐inefficient cultivars regardless of Co level.”
The same questions in other papers
cobalt atom · physiology: pigments · Glycine max (soybean)Results differ
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
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See all 5 papers →cobalt atom · physiology: pigments · Solanum lycopersicum (tomato)Results differ
5 papers in the same direction as this paper · 3 in the opposite direction
- negative
- positive
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See all 9 papers →cobalt atom · nutrient: content · Glycine max (soybean)Positive and negative results
7 in the opposite direction
- positive
- positive
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See all 8 papers →cobalt atom · nutrient: content · Solanum lycopersicum (tomato)Results agree
1 paper in the same direction as this paper
- 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.