Abstract
Abstract Chickpea plants (Cicer arietinum L cv. ILC 195) were grown for 24 days in water culture under two regimes of nitrogen nutrition (NO3 or NH4‐N) with or without Fe. For plants fed with NO3‐N, Fe stress severely depressed fresh weight accumulation and chlorotic symptoms of Fe‐deficiency developed rapidly. Little difference in growth occurred in the NH4‐fed plants, whether or not Fe was withheld, with no visual evidence of Fe‐deficiency indicating a beneficial effect of NH4 in depressing the symptoms of Fe chlorosis. Typical pH changes were measured in the nutrient solution of the control plants in relation to nitrogen supply, increasing with NO3 and decreasing with NH4‐nutrition. With both forms of nitrogen, plants acidified the nutrient solution in response to Fe‐stress. Under NH4‐nutrition, acidification was enhanced by withholding Fe. In the NO3‐fed plants the uptake of all nutrients was reduced by the stress but proportionally NO3‐ and K+ were most affected. Total anion uptake was depressed more than that of cation uptake. For the NH4‐fed plants withholding Fe resulted in an increased uptake of all ions except NH4 + which was depressed. Regardless of the form of N‐supply, when Fe was withheld from the nutrient solution the net H+ efflux calculated from the (C‐A) uptake values was closely balanced by the OH” added to the nutrient solution to compensate for the pH changes. Evidence of accumulation of organic acids in the Fe‐stressed plants was found, especially in the NO3‐fed plants, indicating a role for these internally produced anion charges in balancing cation charge in relation to the depression of NO3 ‐ uptake associated with Fe‐stress.
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Claims 16
Claim · model-written summary
Fe stress severely depressed fresh weight accumulation in nitrate-fed chickpea.
Verbatim
e0“For plants fed with NO3‐N, Fe stress severely depressed fresh weight accumulation”
t0“chickpea plants”
Claim · model-written summary
Nitrate-fed chickpea rapidly developed Fe-deficiency chlorosis under Fe stress.
- Taxon
- plantsViridiplantaet0
- Treatment
- Fe stresse0
- Outcome
- chlorotic symptoms of Fe‐deficiencye0
- Qualifier
- rapidlye0
Verbatim
e0“For plants fed with NO3‐N, Fe stress severely depressed fresh weight accumulation and chlorotic symptoms of Fe‐deficiency developed rapidly.”
t0“chickpea plants”
Claim · model-written summary
Ammonium-fed chickpea growth changed little when Fe was withheld.
Verbatim
e0“Little difference in growth occurred in the NH4‐fed plants, whether or not Fe was withheld”
Claim · model-written summary
Ammonium-fed chickpea had no visible Fe-deficiency symptoms under Fe withholding.
- Taxon
- plantsViridiplantaet0
- Outcome
- no visual evidence of Fe‐deficiencye0
Verbatim
e0“with no visual evidence of Fe‐deficiency indicating a beneficial effect of NH4 in depressing the symptoms of Fe chlorosis.”
t0“chickpea plants”
Claim · model-written summary
Nitrate nutrition increased nutrient-solution pH in control chickpea.
Verbatim
e0“Typical pH changes were measured in the nutrient solution of the control plants in relation to nitrogen supply, increasing with NO3”
t0“chickpea plants”
Claim · model-written summary
Ammonium nutrition decreased nutrient-solution pH in control chickpea.
Verbatim
e0“Typical pH changes were measured in the nutrient solution of the control plants in relation to nitrogen supply, increasing with NO3 and decreasing with NH4‐nutrition.”
t0“chickpea plants”
Claim · model-written summary
Under both nitrogen forms, Fe-stressed chickpea acidified the nutrient solution.
- Taxon
- plantsViridiplantaet0
- Treatment
- Fe‐stresse0
- Outcome
- acidified the nutrient solutione0
Verbatim
e0“With both forms of nitrogen, plants acidified the nutrient solution in response to Fe‐stress.”
t0“chickpea plants”
Claim · model-written summary
Withholding Fe enhanced acidification under ammonium nutrition.
Verbatim
e0“Under NH4‐nutrition, acidification was enhanced by withholding Fe.”
t0“chickpea plants”
Claim · model-written summary
Fe stress reduced uptake of all nutrients in nitrate-fed chickpea.
Verbatim
e0“In the NO3‐fed plants the uptake of all nutrients was reduced by the stress”
t0“chickpea plants”
Claim · model-written summary
Nitrate and potassium uptake were proportionally most affected by Fe stress in nitrate-fed chickpea.
- Taxon
- plantsViridiplantaet0
- Treatment
- the stresse0
- Outcome
- NO3‐ and K+ were most affectede0
Verbatim
e0“In the NO3‐fed plants the uptake of all nutrients was reduced by the stress but proportionally NO3‐ and K+ were most affected.”
t0“chickpea plants”
Claim · model-written summary
Fe stress depressed total anion uptake more than cation uptake.
Not reportedTaxonTreatment
Verbatim
e0“Total anion uptake was depressed more than that of cation uptake.”
Claim · model-written summary
Withholding Fe increased uptake of all ions except ammonium in ammonium-fed chickpea.
Verbatim
e0“For the NH4‐fed plants withholding Fe resulted in an increased uptake of all ions except NH4 + which was depressed.”
t0“chickpea plants”
Claim · model-written summary
Withholding Fe depressed ammonium uptake in ammonium-fed chickpea.
Verbatim
e0“For the NH4‐fed plants withholding Fe resulted in an increased uptake of all ions except NH4 + which was depressed.”
t0“chickpea plants”
Claim · model-written summary
Under Fe withholding, calculated net H+ efflux closely balanced OH” added to counter pH change.
- Taxon
- plantsViridiplantaet0
- Treatment
- Fe was withhelde0
- Outcome
- net H+ effluxe0
- Comparator
- OH” added to the nutrient solutione0
Verbatim
e0“Regardless of the form of N‐supply, when Fe was withheld from the nutrient solution the net H+ efflux calculated from the (C‐A) uptake values was closely balanced by the OH” added to the nutrient solution to compensate for the pH changes.”
t0“chickpea plants”
Claim · model-written summary
Organic acids accumulated in Fe-stressed chickpea, especially under nitrate nutrition.
- Taxon
- plantsViridiplantaet0
- Treatment
- Fe‐stressede0
- Outcome
- accumulation of organic acidse0
- Qualifier
- especially in the NO3‐fed plantse0
Verbatim
e0“Evidence of accumulation of organic acids in the Fe‐stressed plants was found, especially in the NO3‐fed plants”
t0“chickpea plants”
Claim · model-written summary
The authors suggest internally produced organic acid anions help balance cation charge as nitrate uptake falls under Fe stress.
Not reportedTaxon
Verbatim
e0“indicating a role for these internally produced anion charges in balancing cation charge in relation to the depression of NO3 ‐ uptake associated with Fe‐stress.”
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This paper is about lacking the nutrient, so it counts the other way round here.
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See all 6 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.