Abstract
Magnesium (Mg) plays important roles in photosynthesis and protein synthesis; however, latent Mg deficiencies are common phenomena that can influence food quality. Nevertheless, the effects of Mg fertilizer additions on plant carbon (C):nitrogen (N):phosphorus (P) stoichiometry, an important index of food quality, are unclear and the underlying mechanisms unexplored. We conducted a greenhouse experiment using low-Mg in situ soil without and with a gradient of Mg additions to investigate the effect of Mg fertilizer on growth and stoichiometry of maize and soybean and also measure these plants' main symbiotic microorganisms: arbuscular mycorrhizal fungi (AMF) and rhizobium, respectively. Our results showed that Mg addition significantly improved both plant species' growth and also increased N and P concentrations in soybean and maize, respectively, resulting in low C:N ratio and high N:P ratio in soybean and low C:P and N:P ratios in maize. These results presumably stemmed from the increase of nutrients supplied by activation-enhanced plant symbiotic microorganisms, an explanation supported by statistically significant positive correlations between plant stoichiometry and plants' symbiotic microorganisms' increased growth with Mg addition. We conclude that Mg supply can improve plant growth and alter plant stoichiometry via enhanced activity of plant symbiotic microorganisms. Possible mechanisms underlying this positive plant-soil feedback include an enhanced photosynthetic product flow to roots caused by adequate Mg supply.
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Claims 11
Claim · model-written summary
Magnesium addition significantly improved maize growth.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mg addition significantly improved both plant species' growth”
e1“growth and stoichiometry of maize and soybean”
Claim · model-written summary
Magnesium addition significantly improved soybean growth.
- Taxon
- soybean
Glycine maxe1 - Treatment
- Mg additione0
- Outcome
- growthe0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mg addition significantly improved both plant species' growth”
e1“growth and stoichiometry of maize and soybean”
Claim · model-written summary
Magnesium increased soybean nitrogen concentration.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Mg additione0
- Outcome
- Ne0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mg addition significantly improved both plant species' growth and also increased N and P concentrations in soybean and maize, respectively”
Claim · model-written summary
Magnesium increased maize phosphorus concentration.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mg addition significantly improved both plant species' growth and also increased N and P concentrations in soybean and maize, respectively”
Claim · model-written summary
Magnesium yielded low soybean C:N ratio.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Mg additione1
- Outcome
- C:N ratioe0
- Direction
- lowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low C:N ratio and high N:P ratio in soybean”
e1“Mg addition significantly improved both plant species' growth and also increased N and P concentrations in soybean and maize, respectively”
Claim · model-written summary
Magnesium yielded high soybean N:P ratio.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Mg additione1
- Outcome
- N:P ratioe0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low C:N ratio and high N:P ratio in soybean”
e1“Mg addition significantly improved both plant species' growth and also increased N and P concentrations in soybean and maize, respectively”
Claim · model-written summary
Magnesium yielded low maize C:P.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low C:P and N:P ratios in maize”
e1“Mg addition significantly improved both plant species' growth and also increased N and P concentrations in soybean and maize, respectively”
Claim · model-written summary
Magnesium yielded low maize N:P ratios.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low C:P and N:P ratios in maize”
e1“Mg addition significantly improved both plant species' growth and also increased N and P concentrations in soybean and maize, respectively”
Claim · model-written summary
Plant stoichiometry positively correlated with symbiont growth following magnesium addition.
- Treatment
- Mg additione0
- Interactor
- symbiotic microorganismse0symbiont
- Outcome
- plant stoichiometrye0
- Direction
- positive correlationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“statistically significant positive correlations between plant stoichiometry and plants' symbiotic microorganisms' increased growth with Mg addition”
e1“growth and stoichiometry of maize and soybean”
Claim · model-written summary
Authors attribute magnesium related plant growth and stoichiometry to increased symbiont activity.
- Treatment
- Mg supplye0
- Interactor
- plant symbiotic microorganismse0symbiont
- Outcome
- plant growth and alter plant stoichiometrye0
- Qualifier
- enhanced activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mg supply can improve plant growth and alter plant stoichiometry via enhanced activity of plant symbiotic microorganisms”
e1“growth and stoichiometry of maize and soybean”
Claim · model-written summary
Enhanced photosynthetic product flow to roots was proposed as a possible feedback mechanism.
- Treatment
- adequate Mg supplye0
- Outcome
- positive plant-soil feedbacke0
- Qualifier
- enhanced photosynthetic product flow to rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Possible mechanisms underlying this positive plant-soil feedback include an enhanced photosynthetic product flow to roots caused by adequate Mg supply”
e1“growth and stoichiometry of maize and soybean”
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