Abstract
Abstract Magnesium (Mg) is known as one of the essential nutrients for higher plants; yet, the preliminary physiological responses of field crops to its deficiency or excess, particularly to its interaction with potassium (K), remain largely unknown. In this study, we observed that Mg deficiency in rice ( Oryza sativa ) [less than 1.1 mg g −1 dry weight (DW) in the shoot] resulted in significant reduction in shoot biomass, decrease in total chlorophyll concentration and net photosynthetic rate and reduction in activities of both nitrate reductase [NR; enzyme classification (EC) 1.6.6.1] and glutamine synthetase (EC 6.3.1.2) in the leaves. However, the Mg‐deficient plant contained higher starch in the leaves, and partitioned larger biomass into roots. Excess of Mg (more than 3.0 mg g −1 DW in the shoot), together with low K supply, suppressed NR activity and decreased concentration of soluble sugar in the leaves. There were great antagonistic and moderately synergistic effects between K and Mg, but the effects of K were much more significant than those of Mg on their uptake and translocation, NR activity and net photosynthetic rate in the leaves. The optimum weight ratio of K to Mg ranged between 22 and 25 in the leaves at tillering stage. Mg deficiency was not compensated for by moderate supply of K but was aggravated by excess supply of K, suggesting specific roles of Mg in both dry matter production and partition of carbon assimilates in rice.
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Claims 8
Claim · model-written summary
Mg deficiency in rice significantly reduced shoot biomass.
- Taxon
- rice
Oryza sativae1 - Treatment
- Mg deficiencye1
- Outcome
- shoot biomasse1
- Direction
- significant reductione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mg deficiency in rice ( Oryza sativa ) [less than 1.1 mg g −1 dry weight (DW) in the shoot] resulted in significant reduction in shoot biomass”
Claim · model-written summary
Mg-deficient rice had higher starch in the leaves.
- Taxon
- riceOryza sativae1
- Treatment
- Mg deficiencye1
- Outcome
- starch in the leavese3
- Direction
- highere3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mg deficiency in rice ( Oryza sativa ) [less than 1.1 mg g −1 dry weight (DW) in the shoot] resulted in significant reduction in shoot biomass”
e3“contained higher starch in the leaves, and partitioned larger biomass into roots”
Claim · model-written summary
Mg deficiency shifted larger biomass partitioning into roots in rice.
- Taxon
- riceOryza sativae1
- Treatment
- Mg deficiencye1
- Outcome
- partitioned larger biomass into rootse3
- Direction
- largere3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mg deficiency in rice ( Oryza sativa ) [less than 1.1 mg g −1 dry weight (DW) in the shoot] resulted in significant reduction in shoot biomass”
e3“contained higher starch in the leaves, and partitioned larger biomass into roots”
Claim · model-written summary
Excess Mg with low K suppressed nitrate reductase activity in rice leaves.
- Taxon
- riceOryza sativae1
- Treatment
- Excess of Mge4
- Outcome
- NR activitye4
- Direction
- suppressede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mg deficiency in rice ( Oryza sativa ) [less than 1.1 mg g −1 dry weight (DW) in the shoot] resulted in significant reduction in shoot biomass”
e4“Excess of Mg (more than 3.0 mg g −1 DW in the shoot), together with low K supply, suppressed NR activity and decreased concentration of soluble sugar in the leaves”
Claim · model-written summary
Excess Mg with low K decreased soluble sugar concentration in rice leaves.
- Taxon
- riceOryza sativae1
- Treatment
- Excess of Mge4
- Outcome
- concentration of soluble sugare4
- Direction
- decreasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mg deficiency in rice ( Oryza sativa ) [less than 1.1 mg g −1 dry weight (DW) in the shoot] resulted in significant reduction in shoot biomass”
e4“Excess of Mg (more than 3.0 mg g −1 DW in the shoot), together with low K supply, suppressed NR activity and decreased concentration of soluble sugar in the leaves”
Claim · model-written summary
Potassium and magnesium showed antagonistic and moderately synergistic effects in rice.
- Taxon
- riceOryza sativae1
- Outcome
- antagonistic and moderately synergistic effectse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mg deficiency in rice ( Oryza sativa ) [less than 1.1 mg g −1 dry weight (DW) in the shoot] resulted in significant reduction in shoot biomass”
e5“There were great antagonistic and moderately synergistic effects between K and Mg”
Claim · model-written summary
Effects of K on uptake and translocation of nutrients were much larger than those of Mg in rice.
- Taxon
- riceOryza sativae1
- Outcome
- uptake and translocatione6
- Qualifier
- much more significante6
- Comparator
- Mge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mg deficiency in rice ( Oryza sativa ) [less than 1.1 mg g −1 dry weight (DW) in the shoot] resulted in significant reduction in shoot biomass”
e6“the effects of K were much more significant than those of Mg on their uptake and translocation, NR activity and net photosynthetic rate in the leaves”
Claim · model-written summary
The optimum K to Mg weight ratio in rice leaves at tillering stage was 22 to 25.
- Taxon
- riceOryza sativae1
- Organ / stage
- leaves at tillering stagee7
- Outcome
- optimum weight ratio of K to Mge7
- Value
- 22 and 25e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mg deficiency in rice ( Oryza sativa ) [less than 1.1 mg g −1 dry weight (DW) in the shoot] resulted in significant reduction in shoot biomass”
e7“The optimum weight ratio of K to Mg ranged between 22 and 25 in the leaves at tillering stage”
The same questions in other papers
magnesium atom · growth · Oryza sativa (rice)Results differ
10 papers in the same direction as this paper · 5 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- positive
- positive
12 papers more in this group
See all 16 papers →magnesium atom · physiology: osmolytes · Oryza sativa (rice)Positive and negative results
2 in the opposite direction
- positive
- positive
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.