Abstract
Magnesium(Mg) is one of the essential nutrients for higher plants.It plays an essential role in photosynthesis and many other metabolic processes.Rice(Oryza sativa L.) plants were grown in hydroponics culture at three Mg~(2+) levels under a greenhouse conditions to investigate the effects of different Mg concentrations on root growth,Mg uptake and some related physiological characteristics of rice.The results showed that root dry matter weight,root to shoot ratio,total root length,root activity,bleeding sap flow rate,the concentrations of total free amino acids and Mg in bleeding sap,Mg influx rate and Mg uptake rate of rice were significantly related to Mg supply levels.At low Mg~(2+) supply(0.05 mmol/L),rice plants partitioned larger proportion of dry matter to the roots causing to an increase of total root length and root to shoot dry weight ratio before Mg deficiency in rice leaves,which might be one of adaptive low-Mg-stress mechanisms of rice at early growth stage.Moderate Mg~(2+) supply(1.0 mmol/L) was able to promote plant growth and development, increase dry matter yield,and enhance root activity and bleeding sap rate as well as the total free amino acids contents. Root activity and amino-synthesized power might be restrained to a certain extent by low or high levels of Mg~(2+) (5.0 mmol/L).The results also showed that Mg uptake,Mg concentrations in the bleeding saps,average Mg influx rate and the Mg uptake rate were significantly increased with an increase of Mg~(2+) concentrations in the nutrient solution.
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Claims 10
Claim · model-written summary
Root dry weight, root to shoot ratio, root length, root activity, sap flow, sap amino acids and magnesium, influx and uptake were significantly related to magnesium supply.
- Taxon
- rice
Oryza sativae0 - Treatment
- Mg supply levelse0
- Outcome
- root dry matter weight,root to shoot ratio,total root lengthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root dry matter weight,root to shoot ratio,total root length,root activity,bleeding sap flow rate,the concentrations of total free amino acids and Mg in bleeding sap,Mg influx rate and Mg uptake rate of rice were significantly related to Mg supply levels”
Claim · model-written summary
Low magnesium supply increased allocation of dry matter to roots.
- Taxon
- riceOryza sativae0
- Treatment
- low Mg~(2+) supply(0.05 mmol/L)e0
- Outcome
- proportion of dry matter to the rootse0
- Direction
- largere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low Mg~(2+) supply(0.05 mmol/L),rice plants partitioned larger proportion of dry matter to the roots”
Claim · model-written summary
Low magnesium supply increased total root length.
- Taxon
- riceOryza sativae0
- Treatment
- low Mg~(2+) supply(0.05 mmol/L)e0
- Outcome
- total root lengthe0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low Mg~(2+) supply(0.05 mmol/L),rice plants partitioned larger proportion of dry matter to the roots causing to an increase of total root length and root to shoot dry weight ratio before Mg deficiency in rice leaves”
Claim · model-written summary
Low magnesium supply increased the root to shoot dry weight ratio before leaf deficiency.
- Taxon
- riceOryza sativae0
- Treatment
- low Mg~(2+) supply(0.05 mmol/L)e0
- Outcome
- root to shoot dry weight ratioe0
- Direction
- increasee0
- Qualifier
- before Mg deficiency in rice leavese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low Mg~(2+) supply(0.05 mmol/L),rice plants partitioned larger proportion of dry matter to the roots causing to an increase of total root length and root to shoot dry weight ratio before Mg deficiency in rice leaves”
Claim · model-written summary
Moderate magnesium supply promoted plant growth and development.
- Taxon
- RiceOryza sativat0
- Treatment
- Moderate Mg~(2+) supply(1.0 mmol/L)e0
- Outcome
- plant growth and developmente0
- Direction
- promotee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moderate Mg~(2+) supply(1.0 mmol/L) was able to promote plant growth and development”
t0“rice”
Claim · model-written summary
Moderate magnesium supply increased dry matter yield.
- Taxon
- RiceOryza sativat0
- Treatment
- Moderate Mg~(2+) supply(1.0 mmol/L)e0
- Outcome
- dry matter yielde0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moderate Mg~(2+) supply(1.0 mmol/L) was able to promote plant growth and development, increase dry matter yield”
t0“rice”
Claim · model-written summary
Moderate magnesium supply enhanced root activity and bleeding sap rate.
- Taxon
- RiceOryza sativat0
- Treatment
- Moderate Mg~(2+) supply(1.0 mmol/L)e0
- Outcome
- root activity and bleeding sap ratee0
- Direction
- enhancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moderate Mg~(2+) supply(1.0 mmol/L) was able to promote plant growth and development, increase dry matter yield,and enhance root activity and bleeding sap rate as well as the total free amino acids contents”
t0“rice”
Claim · model-written summary
Moderate magnesium supply enhanced total free amino acid content.
- Taxon
- RiceOryza sativat0
- Treatment
- Moderate Mg~(2+) supply(1.0 mmol/L)e0
- Outcome
- total free amino acids contentse0
- Direction
- enhancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moderate Mg~(2+) supply(1.0 mmol/L) was able to promote plant growth and development, increase dry matter yield,and enhance root activity and bleeding sap rate as well as the total free amino acids contents”
t0“rice”
Claim · model-written summary
Low or high magnesium levels may restrain root activity and amino synthesis.
- Taxon
- RiceOryza sativat0
- Treatment
- low or high levels of Mg~(2+) (5.0 mmol/L)e0
- Outcome
- Root activity and amino-synthesized powere0
- Direction
- restrainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root activity and amino-synthesized power might be restrained to a certain extent by low or high levels of Mg~(2+) (5.0 mmol/L)”
t0“rice”
Claim · model-written summary
Magnesium uptake, sap magnesium concentration, mean influx and uptake rate increased with nutrient solution magnesium.
- Taxon
- RiceOryza sativat0
- Treatment
- Mg~(2+) concentrations in the nutrient solutione0
- Outcome
- Mg uptake,Mg concentrations in the bleeding saps,average Mg influx ratee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mg uptake,Mg concentrations in the bleeding saps,average Mg influx rate and the Mg uptake rate were significantly increased with an increase of Mg~(2+) concentrations in the nutrient solution”
t0“rice”
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