Abstract
Abstract Iron (Fe) deficiency is common in calcareous soils. Application of FeEDDHA is effective in correction of Fe deficiency in such soils. However, it may decrease concentration and uptake of some micronutrients including manganese (Mn). The effect of Fe on Mn status of different soybean [Glycin max (L.) Merr.] genotypes was studied in a greenhouse experiment in a completely randomized design with three replicates. The treatments consisted of three Fe levels (0, 2.5, and 5 mg Fe kg−1 as FeEDDHA) and 12 soybean genotypes. Results showed that application of Fe increased top dry weight of Wells, Black hack, Elgin, and A3237, but decreased that of Steel and A3935 and had no effect on other genotypes. Addition of Fe increased concentration and uptake of Fe, but decreased that of Mn in all genotypes. The Fe:Mn ratio greater than 0.4 in plant tops when both Fe and Mn were in the nutrient sufficiency range were considered to be an indication of tolerance to Fe deficiency, as these genotypes did not respond to Fe fertilizer. Regression equations showed that the highest reduction of Mn concentration occurred at 2.5 mg Fe kg−1. Manganese concentration was reduced by 13, 17, and 19% due to the dilution effect only in Black hack, A3237, and Elgin, respectively. Iron application did not cause either Fe toxicity in soybean or suppression in root:shoot ratio. It seems that Fe addition reduced Mn concentration in some soybean genotypes probably either by reduction of Mn concentration and/or translocation of Mn from root to shoot. The fact that soybeans are highly sensitive to Fe and Mn deficiencies and use of expensive FeEDDHA might accentuate Mn deficiency or imbalance in soybeans demonstrates a need to screen out and select soybean genotypes resistant to Fe stress.
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Claims 19
Claim · model-written summary
Fe application increased top dry weight in soybean genotype Wells.
- Taxon
- soybean
Glycine maxt0 - Material
- Wellse0
- Treatment
- application of Fee0
- Outcome
- top dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that application of Fe increased top dry weight of Wells, Black hack, Elgin, and A3237, but decreased that of Steel and A3935 and had no effect on other genotypes.”
t0“Soybean”
Claim · model-written summary
Fe application increased top dry weight in soybean genotype Black hack.
- Taxon
- soybeanGlycine maxt0
- Material
- Black hacke0
- Treatment
- application of Fee0
- Outcome
- top dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that application of Fe increased top dry weight of Wells, Black hack, Elgin, and A3237, but decreased that of Steel and A3935 and had no effect on other genotypes.”
t0“Soybean”
Claim · model-written summary
Fe application increased top dry weight in soybean genotype Elgin.
- Taxon
- soybeanGlycine maxt0
- Material
- Elgine0
- Treatment
- application of Fee0
- Outcome
- top dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that application of Fe increased top dry weight of Wells, Black hack, Elgin, and A3237, but decreased that of Steel and A3935 and had no effect on other genotypes.”
t0“Soybean”
Claim · model-written summary
Fe application increased top dry weight in soybean genotype A3237.
- Taxon
- soybeanGlycine maxt0
- Material
- A3237e0
- Treatment
- application of Fee0
- Outcome
- top dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that application of Fe increased top dry weight of Wells, Black hack, Elgin, and A3237, but decreased that of Steel and A3935 and had no effect on other genotypes.”
t0“Soybean”
Claim · model-written summary
Fe application decreased top dry weight in soybean genotype Steel.
- Taxon
- soybeanGlycine maxt0
- Material
- Steele0
- Treatment
- application of Fee0
- Outcome
- top dry weighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that application of Fe increased top dry weight of Wells, Black hack, Elgin, and A3237, but decreased that of Steel and A3935 and had no effect on other genotypes.”
t0“Soybean”
Claim · model-written summary
Fe application decreased top dry weight in soybean genotype A3935.
- Taxon
- soybeanGlycine maxt0
- Material
- A3935e0
- Treatment
- application of Fee0
- Outcome
- top dry weighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that application of Fe increased top dry weight of Wells, Black hack, Elgin, and A3237, but decreased that of Steel and A3935 and had no effect on other genotypes.”
t0“Soybean”
Claim · model-written summary
Fe application had no effect on top dry weight in the other soybean genotypes.
- Taxon
- soybeanGlycine maxt0
- Material
- other genotypese0
- Treatment
- application of Fee0
- Outcome
- top dry weighte0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that application of Fe increased top dry weight of Wells, Black hack, Elgin, and A3237, but decreased that of Steel and A3935 and had no effect on other genotypes.”
t0“Soybean”
Claim · model-written summary
Fe addition increased Fe concentration and uptake in all soybean genotypes.
- Taxon
- soybeanGlycine maxt0
- Material
- all genotypese0
- Treatment
- Addition of Fee0
- Outcome
- concentration and uptake of Fee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of Fe increased concentration and uptake of Fe, but decreased that of Mn in all genotypes.”
t0“Soybean”
Claim · model-written summary
Fe addition decreased Mn concentration and uptake in all soybean genotypes.
- Taxon
- soybeanGlycine maxt0
- Material
- all genotypese0
- Treatment
- Addition of Fee0
- Outcome
- uptake of Fe, but decreased that of Mne0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of Fe increased concentration and uptake of Fe, but decreased that of Mn in all genotypes.”
t0“Soybean”
Claim · model-written summary
A plant-top Fe:Mn ratio greater than 0.4 indicated Fe-deficiency tolerance when both nutrients were sufficient.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- plant topse0
- Outcome
- tolerance to Fe deficiencye0
- Value
- greater than 0.4e0
- Qualifier
- when both Fe and Mn were in the nutrient sufficiency rangee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Fe:Mn ratio greater than 0.4 in plant tops when both Fe and Mn were in the nutrient sufficiency range were considered to be an indication of tolerance to Fe deficiency, as these genotypes did not respond to Fe fertilizer.”
t0“Soybean”
Claim · model-written summary
Genotypes meeting this Fe:Mn criterion did not respond to Fe fertilizer.
- Taxon
- soybeanGlycine maxt0
- Material
- these genotypese0
- Treatment
- Fe fertilizere0
- Outcome
- respond to Fe fertilizere0
- Direction
- did not responde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Fe:Mn ratio greater than 0.4 in plant tops when both Fe and Mn were in the nutrient sufficiency range were considered to be an indication of tolerance to Fe deficiency, as these genotypes did not respond to Fe fertilizer.”
t0“Soybean”
Claim · model-written summary
The largest Mn concentration reduction occurred at 2.5 mg Fe kg−1.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 2.5 mg Fe kg−1e0
- Outcome
- Mn concentratione0
- Direction
- highest reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regression equations showed that the highest reduction of Mn concentration occurred at 2.5 mg Fe kg−1.”
t0“Soybean”
Claim · model-written summary
Mn concentration was reduced by 13 in Black hack due to dilution.
- Taxon
- soybeanGlycine maxt0
- Material
- Black hacke0
- Outcome
- Manganese concentratione0
- Direction
- reducede0
- Value
- 13e0
- Qualifier
- due to the dilution effecte0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Manganese concentration was reduced by 13, 17, and 19% due to the dilution effect only in Black hack, A3237, and Elgin, respectively.”
t0“Soybean”
Claim · model-written summary
Mn concentration was reduced by 17 in A3237 due to dilution.
- Taxon
- soybeanGlycine maxt0
- Material
- A3237e0
- Outcome
- Manganese concentratione0
- Direction
- reducede0
- Value
- 17e0
- Qualifier
- due to the dilution effecte0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Manganese concentration was reduced by 13, 17, and 19% due to the dilution effect only in Black hack, A3237, and Elgin, respectively.”
t0“Soybean”
Claim · model-written summary
Mn concentration was reduced by 19% in Elgin due to dilution.
- Taxon
- soybeanGlycine maxt0
- Material
- Elgine0
- Outcome
- Manganese concentratione0
- Direction
- reducede0
- Value
- 19%e0
- Qualifier
- due to the dilution effecte0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Manganese concentration was reduced by 13, 17, and 19% due to the dilution effect only in Black hack, A3237, and Elgin, respectively.”
t0“Soybean”
Claim · model-written summary
Iron application caused no Fe toxicity in soybean.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Iron applicatione0
- Outcome
- Fe toxicitye0
- Direction
- did not causee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron application did not cause either Fe toxicity in soybean or suppression in root:shoot ratio.”
Claim · model-written summary
Iron application did not suppress the root:shoot ratio in soybean.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Iron applicatione0
- Outcome
- root:shoot ratioe0
- Direction
- did not causee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron application did not cause either Fe toxicity in soybean or suppression in root:shoot ratio.”
Claim · model-written summary
Fe addition may have reduced Mn concentration through reduced Mn concentration or altered root-to-shoot translocation.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Fe additione0
- Outcome
- Mn concentratione0
- Direction
- reducede0
- Qualifier
- probably either by reduction of Mn concentration and/or translocation of Mn from root to shoote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It seems that Fe addition reduced Mn concentration in some soybean genotypes probably either by reduction of Mn concentration and/or translocation of Mn from root to shoot.”
Claim · model-written summary
The authors recommend screening and selecting soybean genotypes resistant to Fe stress.
- Taxon
- soybeanGlycine maxe0
- Outcome
- screen out and select soybean genotypes resistant to Fe stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fact that soybeans are highly sensitive to Fe and Mn deficiencies and use of expensive FeEDDHA might accentuate Mn deficiency or imbalance in soybeans demonstrates a need to screen out and select soybean genotypes resistant to Fe stress.”
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