Abstract
Abstract Effect of light intensity on Mn‐induced chlorosiss was investigated with bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings. The seedlings were grown in nutrient solutions containing different concentrations of Mn in enclosures which transmitted different percentages of the total solar radiation. At high levels of Mn in nutrient solution, the increase in light intensity increased the Mn uptake by the plant and resulted in a decrease in the chlorophyll content of the leaves. Even at similar levels of Mn concentrations within the leaves, high light intensity increased the severity of Mn‐induced chlorosis. Photobleaching experiments were carried out with isolated chloroplasts suspended in media containing 0, 10‐4 , 10‐3,10‐2 and 10‐1 M Mn2+. Addition of Mn2+ to the medium decreased the extent of photobleacing of chlorophyll with increaing Mn2+ concentration up to 10‐3 M . In concentrations of Mn2+ higher than 10‐3 M, the extent of bleaching was increased again, accompanied by precipitation of oxidized manganese in the medium. It is suggested that high light intensity stimulates not only the Mn uptake by the plant but also the destruction of chlorophyll when Mn in excess. Key words: manganese toxicitychlorosisphotooxidation Phaseolus vulgaris L Zea mays L
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Claims 14
Claim · model-written summary
At high nutrient Mn, stronger light increased bush bean Mn uptake.
- Taxon
- bush beane0
- Treatment
- increase in light intensitye1
- Outcome
- Mn uptakee1
- Direction
- increasede1
- Qualifier
- At high levels of Mn in nutrient solutione1
Not reportedComparator
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e1“At high levels of Mn in nutrient solution, the increase in light intensity increased the Mn uptake by the plant and resulted in a decrease in the chlorophyll content of the leaves.”
Claim · model-written summary
At high nutrient Mn, stronger light decrease bush bean chlorophyll content.
- Taxon
- bush beane0
- Treatment
- increase in light intensitye1
- Outcome
- chlorophyll contente1
- Direction
- decreasee1
- Qualifier
- At high levels of Mn in nutrient solutione1
Not reportedComparator
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e1“At high levels of Mn in nutrient solution, the increase in light intensity increased the Mn uptake by the plant and resulted in a decrease in the chlorophyll content of the leaves.”
Claim · model-written summary
At similar leaf Mn, high light increased Mn chlorosis severity in bush bean.
- Taxon
- bush beane0
- Treatment
- high light intensitye2
- Outcome
- severity of Mn‐induced chlorosise2
- Direction
- increasede2
- Qualifier
- Even at similar levels of Mn concentrations within the leavese2
Not reportedComparator
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e2“Even at similar levels of Mn concentrations within the leaves, high light intensity increased the severity of Mn‐induced chlorosis.”
Claim · model-written summary
Mn addition up to 10‐3 M reduced chlorophyll photobleaching in isolated bush bean chloroplasts.
- Taxon
- bush beane0
- Treatment
- Addition of Mn2+ to the mediume3
- Outcome
- extent of photobleacing of chlorophylle3
- Direction
- decreasede3
- Qualifier
- up to 10‐3 Me3
Not reportedComparator
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e3“Addition of Mn2+ to the medium decreased the extent of photobleacing of chlorophyll with increaing Mn2+ concentration up to 10‐3 M .”
Claim · model-written summary
Above 10‐3 M Mn, chlorophyll bleaching increased in isolated bush bean chloroplasts.
Not reportedComparator
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e4“In concentrations of Mn2+ higher than 10‐3 M, the extent of bleaching was increased again, accompanied by precipitation of oxidized manganese in the medium.”
Claim · model-written summary
Above 10‐3 M Mn, oxidized manganese precipitated in the bush bean chloroplast medium.
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e4“In concentrations of Mn2+ higher than 10‐3 M, the extent of bleaching was increased again, accompanied by precipitation of oxidized manganese in the medium.”
Claim · model-written summary
Authors suggest high light stimulates Mn uptake and chlorophyll destruction in Mn-excess bush bean.
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e5“It is suggested that high light intensity stimulates not only the Mn uptake by the plant but also the destruction of chlorophyll when Mn in excess.”
Claim · model-written summary
At high nutrient Mn, stronger light increased corn Mn uptake.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- increase in light intensitye1
- Outcome
- Mn uptakee1
- Direction
- increasede1
- Qualifier
- At high levels of Mn in nutrient solutione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e1“At high levels of Mn in nutrient solution, the increase in light intensity increased the Mn uptake by the plant and resulted in a decrease in the chlorophyll content of the leaves.”
Claim · model-written summary
At high nutrient Mn, stronger light decrease corn chlorophyll content.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- increase in light intensitye1
- Outcome
- chlorophyll contente1
- Direction
- decreasee1
- Qualifier
- At high levels of Mn in nutrient solutione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e1“At high levels of Mn in nutrient solution, the increase in light intensity increased the Mn uptake by the plant and resulted in a decrease in the chlorophyll content of the leaves.”
Claim · model-written summary
At similar leaf Mn, high light increased Mn chlorosis severity in corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- high light intensitye2
- Outcome
- severity of Mn‐induced chlorosise2
- Direction
- increasede2
- Qualifier
- Even at similar levels of Mn concentrations within the leavese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e2“Even at similar levels of Mn concentrations within the leaves, high light intensity increased the severity of Mn‐induced chlorosis.”
Claim · model-written summary
Mn addition up to 10‐3 M reduced chlorophyll photobleaching in isolated corn chloroplasts.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Addition of Mn2+ to the mediume3
- Outcome
- extent of photobleacing of chlorophylle3
- Direction
- decreasede3
- Qualifier
- up to 10‐3 Me3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e3“Addition of Mn2+ to the medium decreased the extent of photobleacing of chlorophyll with increaing Mn2+ concentration up to 10‐3 M .”
Claim · model-written summary
Above 10‐3 M Mn, chlorophyll bleaching increased in isolated corn chloroplasts.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Mn2+ higher than 10‐3 Me4
- Outcome
- extent of bleachinge4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e4“In concentrations of Mn2+ higher than 10‐3 M, the extent of bleaching was increased again, accompanied by precipitation of oxidized manganese in the medium.”
Claim · model-written summary
Above 10‐3 M Mn, oxidized manganese precipitated in the corn chloroplast medium.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- precipitation of oxidized manganesee4
- Qualifier
- Mn2+ higher than 10‐3 Me4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e4“In concentrations of Mn2+ higher than 10‐3 M, the extent of bleaching was increased again, accompanied by precipitation of oxidized manganese in the medium.”
Claim · model-written summary
Authors suggest high light stimulates Mn uptake and chlorophyll destruction in Mn-excess corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- high light intensitye5
- Outcome
- Mn uptake by the plant but also the destruction of chlorophylle5
- Qualifier
- when Mn in excesse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bush bean (Phaseolus vulgaris L.) and corn (Zea mays L.) seedlings”
e5“It is suggested that high light intensity stimulates not only the Mn uptake by the plant but also the destruction of chlorophyll when Mn in excess.”
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See all 21 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.