Abstract
Severely iron-deficient peanuts (Arachis hypogaaea L.) grown on calcareous soils in central Thailand failed to nodulate until given foliar iron applications. Glasshouse experiments were conducted on two cultivars (Tainan 9 and Robut 33-1) to identify which stage of the nodule symbiosis was most sensitive to iron-deficiency. Iron-deficiency did not limit growth of soil or rhizosphere populations of peanut liradyrhizobium. Similar numbers of root nodule initials formed in the roots of both control and iron-sprayed plants, showing that iron-deficiency did not directly affect root infection and nodule initiation. Plants sprayed with iron produced greater numbers of excisable nodules and carried a greater nodule mass than untreated plants. Five days after iron application, nodules on sprayed plants of CV. Tainan 9 contained 200-fold higher bacteroid numbers per unit weight and 14-fold higher concentrations of leghaemoglobain. The onset of nitrogenase activity was also delayed by iron deficiency in both cultivars. Tainan 9 appeared more sensitive to iron-deficiency than Robut 33-1 in terms of nodule mass produced, but both cultivars showed the same effect of iron-deficiency on nitrogenase activity per plant. It is concluded that the failure of the infecting rhizobia to obtain adequate amounts of iron from the plant results in arrested nodule development and a failure of nitrogen fixation.
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Claims 11
Claim · model-written summary
Severely iron-deficient peanuts grown on calcareous soils in central Thailand failed to nodulate until given foliar iron applications.
- Taxon
- peanuts
Arachis hypogaeae0 - Treatment
- foliar iron applicationse0
- Interactor
- Bradyrhizobium sp.
Bradyrhizobiumt1symbiont - Outcome
- failed to nodulatee0
- Direction
- failed to nodulate until givene0
- Setting
- central Thailande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severely iron-deficient peanuts (Arachis hypogaaea L.) grown on calcareous soils in central Thailand failed to nodulate until given foliar iron applications”
t0“peanut”
t1“Bradyrhizobium sp.”
Claim · model-written summary
Iron deficiency did not limit growth of soil or rhizosphere populations of peanut bradyrhizobia.
- Taxon
- peanutArachis hypogaeae0
- Treatment
- Iron-deficiencye0
- Interactor
- liradyrhizobiume0symbiont
- Outcome
- growth of soil or rhizosphere populationse0
- Direction
- did not limite0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron-deficiency did not limit growth of soil or rhizosphere populations of peanut liradyrhizobium”
t0“peanut”
Claim · model-written summary
Similar numbers of root nodule initials formed in control and iron-sprayed plants.
- Taxon
- peanutArachis hypogaeat0
- Treatment
- iron-sprayede0
- Outcome
- numbers of root nodule initialse0
- Direction
- Similare0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar numbers of root nodule initials formed in the roots of both control and iron-sprayed plants”
t0“peanut”
Claim · model-written summary
Iron-sprayed plants produced greater numbers of excisable nodules than untreated plants.
- Taxon
- peanutArachis hypogaeat0
- Treatment
- sprayed with irone0
- Outcome
- numbers of excisable nodulese0
- Direction
- greatere0
- Comparator
- untreated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants sprayed with iron produced greater numbers of excisable nodules and carried a greater nodule mass than untreated plants”
t0“peanut”
Claim · model-written summary
Iron-sprayed plants carried a greater nodule mass than untreated plants.
- Taxon
- peanutArachis hypogaeat0
- Treatment
- sprayed with irone0
- Outcome
- nodule masse0
- Direction
- greatere0
- Comparator
- untreated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants sprayed with iron produced greater numbers of excisable nodules and carried a greater nodule mass than untreated plants”
t0“peanut”
Claim · model-written summary
Five days after iron application, nodules on sprayed Tainan 9 plants contained 200-fold higher bacteroid numbers per unit weight.
- Taxon
- peanutArachis hypogaeat0
- Material
- Tainan 9e0
- Organ / stage
- nodulese0
- Treatment
- iron applicatione0
- Outcome
- bacteroid numbers per unit weighte0
- Direction
- highere0
- Value
- 200-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Five days after iron application, nodules on sprayed plants of CV. Tainan 9 contained 200-fold higher bacteroid numbers per unit weight and 14-fold higher concentrations of leghaemoglobain”
t0“peanut”
Claim · model-written summary
Five days after iron application, nodules on sprayed Tainan 9 plants had 14-fold higher leghaemoglobin concentrations.
- Taxon
- peanutArachis hypogaeat0
- Material
- Tainan 9e0
- Organ / stage
- nodulese0
- Treatment
- iron applicatione0
- Outcome
- concentrations of leghaemoglobaine0
- Direction
- highere0
- Value
- 14-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Five days after iron application, nodules on sprayed plants of CV. Tainan 9 contained 200-fold higher bacteroid numbers per unit weight and 14-fold higher concentrations of leghaemoglobain”
t0“peanut”
Claim · model-written summary
The onset of nitrogenase activity was delayed by iron deficiency in both cultivars.
- Taxon
- peanutArachis hypogaeat0
- Treatment
- iron deficiencye0
- Outcome
- onset of nitrogenase activitye0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The onset of nitrogenase activity was also delayed by iron deficiency in both cultivars”
t0“peanut”
Claim · model-written summary
Tainan 9 appeared more sensitive to iron deficiency than Robut 33-1 in nodule mass produced.
- Taxon
- peanutArachis hypogaeat0
- Material
- Tainan 9e0
- Treatment
- iron-deficiencye0
- Outcome
- nodule mass producede0
- Direction
- more sensitivee0
- Comparator
- Robut 33-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tainan 9 appeared more sensitive to iron-deficiency than Robut 33-1 in terms of nodule mass produced”
t0“peanut”
Claim · model-written summary
Both cultivars showed the same effect of iron deficiency on nitrogenase activity per plant.
- Taxon
- peanutArachis hypogaeat0
- Treatment
- iron-deficiencye0
- Outcome
- nitrogenase activity per plante0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both cultivars showed the same effect of iron-deficiency on nitrogenase activity per plant”
t0“peanut”
Claim · model-written summary
The authors conclude that failure of the infecting rhizobia to obtain adequate iron from the plant results in arrested nodule development and failure of nitrogen fixation.
- Taxon
- peanutArachis hypogaeat0
- Interactor
- rhizobiae0symbiont
- Compound
- irone0
- Outcome
- arrested nodule developmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the failure of the infecting rhizobia to obtain adequate amounts of iron from the plant results in arrested nodule development and a failure of nitrogen fixation”
t0“peanut”
The same questions in other papers
iron atom · symbiosis · Arachis hypogaea (peanut)Results differ
4 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
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See all 6 papers →iron atom · Bradyrhizobium · Arachis hypogaea (peanut)Results agree
1 paper in the same direction as this paper
- positive
iron atom · physiology: enzyme activity · Arachis hypogaea (peanut)Results agree
2 papers in the same direction as this paper
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
application · Bradyrhizobium · Arachis hypogaea (peanut)Results agree
1 paper in the same direction as this paper
- positive
application · symbiosis · Arachis hypogaea (peanut)Results agree
14 papers in the same direction as this paper
- positive
- positive
- positive
11 papers more in this group
See all 15 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.