Abstract
Effects of aeration of flooded rooting medium (quartz sand) on the Fe mobilization and the chlorosis of soybean (Glycine max Merr, L. cv. A7) were investigated. Control plants grown on well‐drained sand mobilized enough Fe from sand and stayed green during the entire experiment. Flooding of the rooting media, irrespective of roots being aerated or not, caused the top 2–3 trifoliate leaves of soybean to turn chlorotic. The lowest chlorophyll concentration of these leaves was reached ca. nine days after commencement of flooding. Leaves of soybean whose roots were flooded, but not aerated, gradually recovered from chlorosis (regreened). By the 37th day, the newly formed leaves contained the same concentration of chlorophyll as the control plants. Leaves of soybean, whose roots were flooded and also aerated, contrary to expectation, never recovered from chlorosis. Also leaves formed by these plants after the onset of flooding were more chlorotic when compared with the flooded and unaerated plants. No clear relation could be detected between the concentrations of Fe, P, K, Ca, Mg, and Mn in the leaves, and the development of, or recovery from chlorosis. These observations along with similar observations by others under calcareous conditions indicate that an insufficient oxygen supply to the roots may not be the direct cause of leaf chlorosis under flooded conditions.
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Claims 9
Claim · model-written summary
Control soybean plants grown on well-drained sand mobilized enough Fe from the sand and stayed green throughout the experiment.
- Taxon
- soybean
Glycine maxe0 - Material
- A7e0
- Outcome
- stayed greene1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max Merr, L. cv. A7)”
e1“Control plants grown on well‐drained sand mobilized enough Fe from sand and stayed green during the entire experiment”
Claim · model-written summary
Flooding of the rooting medium, whether roots were aerated or not, made the top 2-3 trifoliate leaves of soybean turn chlorotic.
- Taxon
- soybeanGlycine maxe0
- Material
- A7e0
- Treatment
- Flooding of the rooting mediae2
- Outcome
- top 2–3 trifoliate leaves of soybean to turn chlorotice2
- Comparator
- Control plants grown on well‐drained sande1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max Merr, L. cv. A7)”
e1“Control plants grown on well‐drained sand”
e2“Flooding of the rooting media, irrespective of roots being aerated or not, caused the top 2–3 trifoliate leaves of soybean to turn chlorotic”
Claim · model-written summary
The lowest leaf chlorophyll concentration was reached about nine days after flooding began.
- Taxon
- soybeanGlycine maxe0
- Material
- A7e0
- Outcome
- lowest chlorophyll concentratione1
- Value
- nine dayse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max Merr, L. cv. A7)”
e1“The lowest chlorophyll concentration of these leaves was reached ca. nine days after commencement of flooding”
Claim · model-written summary
Leaves of soybean whose roots were flooded but not aerated gradually recovered from chlorosis (regreened).
- Taxon
- soybeanGlycine maxe0
- Material
- A7e0
- Treatment
- flooded, but not aeratede1
- Outcome
- recovered from chlorosise1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max Merr, L. cv. A7)”
e1“Leaves of soybean whose roots were flooded, but not aerated, gradually recovered from chlorosis (regreened)”
Claim · model-written summary
By the 37th day newly formed leaves of flooded, unaerated soybean contained the same chlorophyll concentration as control plants.
- Taxon
- soybeanGlycine maxe0
- Material
- A7e0
- Treatment
- flooded, but not aeratede1
- Outcome
- concentration of chlorophylle2
- Direction
- no_changeinferrede2
- Value
- By the 37th daye2
- Comparator
- control plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max Merr, L. cv. A7)”
e1“Leaves of soybean whose roots were flooded, but not aerated”
e2“By the 37th day, the newly formed leaves contained the same concentration of chlorophyll as the control plants”
Claim · model-written summary
Leaves of soybean whose roots were flooded and also aerated never recovered from chlorosis, contrary to expectation.
- Taxon
- soybeanGlycine maxe0
- Material
- A7e0
- Treatment
- flooded and also aeratede1
- Outcome
- never recovered from chlorosise1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max Merr, L. cv. A7)”
e1“Leaves of soybean, whose roots were flooded and also aerated, contrary to expectation, never recovered from chlorosis”
Claim · model-written summary
Leaves formed after the onset of flooding were more chlorotic in plants with flooded and aerated roots than in flooded and unaerated plants.
- Taxon
- soybeanGlycine maxe0
- Material
- A7e0
- Treatment
- flooded and also aeratede1
- Outcome
- more chlorotice2
- Direction
- more chlorotice2
- Comparator
- flooded and unaerated plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max Merr, L. cv. A7)”
e1“whose roots were flooded and also aerated”
e2“Also leaves formed by these plants after the onset of flooding were more chlorotic when compared with the flooded and unaerated plants”
Claim · model-written summary
No clear relation was detected between leaf concentrations of Fe, P, K, Ca, Mg and Mn and the development of, or recovery from, chlorosis.
- Taxon
- soybeanGlycine maxe0
- Material
- A7e0
- Organ / stage
- leavese1
- Compound
- Fe, P, K, Ca, Mg, and Mne1
- Outcome
- development of, or recovery from chlorosise1
- Direction
- no_changeinferrede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max Merr, L. cv. A7)”
e1“No clear relation could be detected between the concentrations of Fe, P, K, Ca, Mg, and Mn in the leaves, and the development of, or recovery from chlorosis”
Claim · model-written summary
The authors conclude that insufficient oxygen supply to the roots may not be the direct cause of leaf chlorosis under flooded conditions.
- Taxon
- soybeanGlycine maxe0
- Material
- A7e0
- Treatment
- flooded conditionse1
- Outcome
- leaf chlorosise1
- Qualifier
- insufficient oxygen supply to the roots may not be the direct causee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean (Glycine max Merr, L. cv. A7)”
e1“an insufficient oxygen supply to the roots may not be the direct cause of leaf chlorosis under flooded conditions”
The same questions in other papers
in vitro · organism · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
flooding · physiology: pigments · Glycine max (soybean)Positive and negative results
10 in the opposite direction
- negative
- negative
- negative
7 papers more in this group
See all 11 papers →flooding · organism · Glycine max (soybean)Results agree
1 paper in the same direction as this paper
- negative
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.