Abstract
Abstract Hydroponic studies with soybean (Glycine max [L.] Merr.) have shown that µmol L−1 additions of Mg2+ were as effective in ameliorating Al rhizotoxicity as additions of Ca2+in the mmol L−1 concentration range. The objectives of this study were to assess the ameliorative effects of Mg on soybean root growth in acidic subsoils and to relate the soil solution ionic compositions to soybean root growth. Roots of soybean cultivar Plant Introduction 416937 extending from a limed surface soil compartment grew for 28 days into a subsurface compartment containing acid subsoils from the Cecil (oxidic and kaolinitic), Creedmoor (montmorillonitic) and Norfolk (kaolinitic) series. The three Mg treatments consisted of native equilibrium soil solution concentrations in each soil (50 or 100 µmol L−1) and MgCl2 additions to achieve 150 and 300 µmol L−1 Mg (Mg150 and Mg300, respectively) in the soil solutions. Root elongations into Mg-treated subsoils were compared with a CaCO3 treatment limed to achieve a soil pH value of 6. Subsoil root growth responses to the Mg treatments were less than for the lime treatments. Root length relative to the limed treatments for all subsoils (RRL) was poorly related to the activity of the soil solution Al species (Al3+ and Al-hydroxyl species) and Mg2+. However, the RRL values were more closely related to the parameters associated with soil solution Ca activity, including (Ca2+), (Al3+)/(Ca2+) and (Al3+)/([Ca2+] + [Mg2+]), suggesting that Ca could be a primary factor ameliorating Al and H+ rhizotoxicity in these subsoils. Increased tolerance to Al rhizotoxicity of soybean by micromolar Mg additions to hydroponic solutions, inducing citrate secretion from roots to externally complex toxic Al, may be less important in acid subsoils with low native Ca levels.
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Claims 5
Claim · model-written summary
Magnesium treatments stimulated soybean subsoil root growth less than lime treatments.
- Taxon
- soybean
Glycine maxe1 - Treatment
- Mg treatmentse0
- Outcome
- Subsoil root growth responsese0
- Direction
- lesse0
- Comparator
- lime treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsoil root growth responses to the Mg treatments were less than for the lime treatments”
e1“soybean (Glycine max [L.] Merr.)”
Claim · model-written summary
Relative soybean root length was poorly related to soil-solution Al and Mg activity.
- Taxon
- soybeanGlycine maxe1
- Compound
- Al species (Al3+ and Al-hydroxyl species) and Mg2+e0
- Outcome
- Root length relative to the limed treatmentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root length relative to the limed treatments for all subsoils (RRL) was poorly related to the activity of the soil solution Al species (Al3+ and Al-hydroxyl species) and Mg2+”
e1“soybean (Glycine max [L.] Merr.)”
Claim · model-written summary
Relative soybean root length related more closely to Ca-associated solution parameters.
- Taxon
- soybeanGlycine maxe1
- Compound
- soil solution Ca activitye0
- Outcome
- RRL valuese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the RRL values were more closely related to the parameters associated with soil solution Ca activity, including (Ca2+), (Al3+)/(Ca2+) and (Al3+)/([Ca2+] + [Mg2+])”
e1“soybean (Glycine max [L.] Merr.)”
Claim · model-written summary
Calcium was suggested as the main ameliorating factor for Al and H+ rhizotoxicity.
- Taxon
- soybeanGlycine maxe1
- Compound
- Cae0
- Outcome
- Al and H+ rhizotoxicitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting that Ca could be a primary factor ameliorating Al and H+ rhizotoxicity in these subsoils”
e1“soybean (Glycine max [L.] Merr.)”
Claim · model-written summary
Magnesium-induced citrate secretion may be less important in acid subsoils with low native calcium.
- Taxon
- soybeanGlycine maxe1
- Compound
- citratee0
- Outcome
- citrate secretion from rootse0
- Qualifier
- acid subsoils with low native Ca levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inducing citrate secretion from roots to externally complex toxic Al, may be less important in acid subsoils with low native Ca levels”
e1“soybean (Glycine max [L.] Merr.)”
The same questions in other papers
magnesium atom · growth · Glycine max (soybean)Positive and negative results
7 papers in the same direction as this paper · 21 in the opposite direction
- no effect
- positive
- positive
25 papers more in this group
See all 29 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.