Abstract
A hydroponic experiment was employed to study the effects of excess iron on the photosynthetic characteristics and on the compositions and fluidity of chloroplast membrane in pea(Pisum sativum) seedling leaves.The results indicated that with the iron concentration increased,net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr),intercellular CO2 concentration(Ci),water use efficiency(WUE) and carboxylation efficiency(CE) showed various degree of downward trends.Chlorophyll content and maximal fluorescence(Fm),the PSⅡmaximal photochemical efficiency(Fv/Fm),PSⅡpotential photochemical efficiency(Fv/Fo),photosynthetic electron transport rate(ETR),maximum quantum yield(Yield) and photochemical quenching coefficient(qP) also declined.However,primary fluorescence(Fo) and non-photochemical quenching coefficient(qN) increased.At the same time,content of unsaturated fatty acids and membrane fluidity of chloroplast increased,while the saturated fatty acids decreased.These results suggested that the iron stress not only caused stomatal inhibition but also destroyed the photosynthetic structure directly.Furthermore,the iron stress also resulted in inactivation of photosynthesis center,decreases of both primary capture capacity and assimilation efficiency of light energy,and increasing leaf chloroplast membrane unsaturation degree,which caused a decline in photosynthetic capacity of pea seedlings finally.
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Claims 12
Claim · model-written summary
With increasing iron concentration, net photosynthetic rate, stomatal conductance and transpiration rate of pea seedling leaves showed downward trends.
- Taxon
- pea
Lathyrus oleraceust0 - Organ / stage
- seedling leavest0
- Treatment
- excess iront1
- Outcome
- net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr)e0
- Direction
- downward trendse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pea seedling leaves”
t1“excess iron stress”
e0“with the iron concentration increased,net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr),intercellular CO2 concentration(Ci),water use efficiency(WUE) and carboxylation efficiency(CE) showed various degree of downward trends”
Claim · model-written summary
With increasing iron concentration, intercellular CO2 concentration, water use efficiency and carboxylation efficiency of pea seedling leaves showed downward trends.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- seedling leavest0
- Treatment
- excess iront1
- Outcome
- intercellular CO2 concentration(Ci),water use efficiency(WUE) and carboxylation efficiency(CE)e0
- Direction
- downward trendse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pea seedling leaves”
t1“excess iron stress”
e0“with the iron concentration increased,net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr),intercellular CO2 concentration(Ci),water use efficiency(WUE) and carboxylation efficiency(CE) showed various degree of downward trends”
Claim · model-written summary
Excess iron lowered chlorophyll content and maximal fluorescence in pea seedling leaves.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- seedling leavest0
- Treatment
- excess iront1
- Outcome
- Chlorophyll content and maximal fluorescence(Fm)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pea seedling leaves”
t1“excess iron stress”
e0“Chlorophyll content and maximal fluorescence(Fm),the PSⅡmaximal photochemical efficiency(Fv/Fm),PSⅡpotential photochemical efficiency(Fv/Fo),photosynthetic electron transport rate(ETR),maximum quantum yield(Yield) and photochemical quenching coefficient(qP) also declined”
Claim · model-written summary
Excess iron lowered PSII maximal and potential photochemical efficiency and electron transport rate in pea seedling leaves.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- seedling leavest0
- Treatment
- excess iront1
- Outcome
- PSⅡmaximal photochemical efficiency(Fv/Fm),PSⅡpotential photochemical efficiency(Fv/Fo),photosynthetic electron transport rate(ETR)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pea seedling leaves”
t1“excess iron stress”
e0“Chlorophyll content and maximal fluorescence(Fm),the PSⅡmaximal photochemical efficiency(Fv/Fm),PSⅡpotential photochemical efficiency(Fv/Fo),photosynthetic electron transport rate(ETR),maximum quantum yield(Yield) and photochemical quenching coefficient(qP) also declined”
Claim · model-written summary
Excess iron lowered maximum quantum yield and photochemical quenching coefficient in pea seedling leaves.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- seedling leavest0
- Treatment
- excess iront1
- Outcome
- maximum quantum yield(Yield) and photochemical quenching coefficient(qP)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pea seedling leaves”
t1“excess iron stress”
e0“Chlorophyll content and maximal fluorescence(Fm),the PSⅡmaximal photochemical efficiency(Fv/Fm),PSⅡpotential photochemical efficiency(Fv/Fo),photosynthetic electron transport rate(ETR),maximum quantum yield(Yield) and photochemical quenching coefficient(qP) also declined”
Claim · model-written summary
Excess iron increased primary fluorescence and non-photochemical quenching coefficient in pea seedling leaves.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- seedling leavest0
- Treatment
- excess iront1
- Outcome
- primary fluorescence(Fo) and non-photochemical quenching coefficient(qN)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pea seedling leaves”
t1“excess iron stress”
e0“primary fluorescence(Fo) and non-photochemical quenching coefficient(qN) increased”
Claim · model-written summary
Excess iron increased chloroplast unsaturated fatty acid content and membrane fluidity in pea seedling leaves.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- seedling leavest0
- Treatment
- excess iront1
- Outcome
- content of unsaturated fatty acids and membrane fluidity of chloroplaste0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pea seedling leaves”
t1“excess iron stress”
e0“content of unsaturated fatty acids and membrane fluidity of chloroplast increased”
Claim · model-written summary
Excess iron decreased saturated fatty acids of chloroplast membranes in pea seedling leaves.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- seedling leavest0
- Treatment
- excess iront1
- Outcome
- saturated fatty acidse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pea seedling leaves”
t1“excess iron stress”
e0“the saturated fatty acids decreased”
Claim · model-written summary
The authors suggest iron stress caused stomatal inhibition in pea seedlings.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- iron stresse0
- Outcome
- stomatal inhibitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pea seedling leaves”
e0“the iron stress not only caused stomatal inhibition but also destroyed the photosynthetic structure directly”
Claim · model-written summary
The authors suggest iron stress directly destroyed the photosynthetic structure of pea seedlings.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- iron stresse0
- Outcome
- destroyed the photosynthetic structuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pea seedling leaves”
e0“the iron stress not only caused stomatal inhibition but also destroyed the photosynthetic structure directly”
Claim · model-written summary
The authors suggest iron stress resulted in inactivation of the photosynthesis center and decreased primary capture capacity and assimilation efficiency of light energy.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- iron stresse0
- Outcome
- inactivation of photosynthesis center,decreases of both primary capture capacity and assimilation efficiency of light energye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“pea seedling leaves”
e0“the iron stress also resulted in inactivation of photosynthesis center,decreases of both primary capture capacity and assimilation efficiency of light energy”
Claim · model-written summary
The authors suggest iron stress finally caused a decline in photosynthetic capacity of pea seedlings.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- excess iront1
- Outcome
- decline in photosynthetic capacitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“excess iron stress”
e0“which caused a decline in photosynthetic capacity of pea seedlings finally”
The same questions in other papers
iron atom · physiology: pigments · Lathyrus oleraceus (pea)Results differ
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See all 5 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.