Abstract
The tolerance of three cultivars of rice (Oryza sativa L.) and three species of the genus Echinochloa to excess magnesium was examined in solution culture. In Echinochloa species, excess MgCl2 or MgSO4 in the culture solution (30 mM) reduced the growth to 33-42% of that in the control plants and caused symptoms resembling those of calcium deficiency. In rice cultivars, however, excess Mg in the culture solution reduced the growth only to 54-67% of that in the control and did not cause the symptoms like those of Ca deficiency. The effect of excess Mg on the mineral contents of plants differed between rice (Nipponbare) and Echinochloa oryzicola. The Mg content of the whole plants in rice increased in proportion to MgCl2 concentration in the culture solution up to 30 mM, while that in E. oryzicola leveled off when MgCl2 concentration exceeded 10 mM. The excess MgCl2 treatment greatly reduced the calcium content of the whole plants in E. oryzicola and slightly in rice. In rice, the excess Mg treatment increased the Mg content of shoots and roots, and the potassium and chloride contents of roots, but slightly decreased the Ca and K contents of shoots. In E. oryzicola, the excess Mg treatment increased the K and Cl contents of shoots and the Mg and K contents of roots, and slightly increased the Mg content of shoots, but greatly decreased the Ca content of shoots. These results indicate that rice is more tolerant than Echinochloa to excess Mg and that the tolerance is related to Ca deficiency.
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Claims 17
Claim · model-written summary
Excess magnesium reduced Echinochloa growth to 33–42% of control.
- Taxon
- Echinochloa
Echinochloae0 - Treatment
- excess MgCl2 or MgSO4 in the culture solution (30 mM)e0
- Outcome
- growthe0
- Direction
- reducede0
- Value
- 33-42%e0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Echinochloa species, excess MgCl2 or MgSO4 in the culture solution (30 mM) reduced the growth to 33-42% of that in the control plants”
Claim · model-written summary
Excess magnesium caused calcium deficiency-like symptoms in Echinochloa.
- Taxon
- EchinochloaEchinochloae0
- Treatment
- excess MgCl2 or MgSO4 in the culture solution (30 mM)e0
- Outcome
- symptoms resembling those of calcium deficiencye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Echinochloa species, excess MgCl2 or MgSO4 in the culture solution (30 mM) reduced the growth to 33-42% of that in the control plants and caused symptoms resembling those of calcium deficiency”
Claim · model-written summary
Excess magnesium reduced rice growth to 54–67% of control.
- Taxon
- rice
Oryza sativae0 - Treatment
- excess Mg in the culture solutione0
- Outcome
- growthe0
- Direction
- reducede0
- Value
- 54-67%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice cultivars, however, excess Mg in the culture solution reduced the growth only to 54-67% of that in the control”
Claim · model-written summary
Excess magnesium did not cause calcium deficiency-like symptoms in rice.
- Taxon
- riceOryza sativae0
- Treatment
- excess Mg in the culture solutione0
- Outcome
- symptoms like those of Ca deficiencye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice cultivars, however, excess Mg in the culture solution reduced the growth only to 54-67% of that in the control and did not cause the symptoms like those of Ca deficiency”
Claim · model-written summary
Whole-plant magnesium in rice increased with solution MgCl2 concentration up to 30 mM.
- Taxon
- riceOryza sativae0
- Treatment
- MgCl2 concentration in the culture solutione0
- Outcome
- Mg content of the whole plantse0
- Direction
- increasede0
- Value
- 30 mMe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Mg content of the whole plants in rice increased in proportion to MgCl2 concentration in the culture solution up to 30 mM”
Claim · model-written summary
Whole-plant magnesium in E. oryzicola leveled off above 10 mM MgCl2.
Verbatim
e0“The Mg content of the whole plants in rice increased in proportion to MgCl2 concentration in the culture solution up to 30 mM, while that in E. oryzicola leveled off when MgCl2 concentration exceeded 10 mM”
t0“Growth and Mineral Content of Rice and Echinochloa”
Claim · model-written summary
Excess MgCl2 greatly reduced whole-plant calcium in E. oryzicola.
- Taxon
- E. oryzicolaEchinochloa oryzicolae0
- Treatment
- excess MgCl2 treatmente0
- Outcome
- calcium content of the whole plantse0
- Direction
- greatly reducede0
Not reportedComparator
Verbatim
e0“The excess MgCl2 treatment greatly reduced the calcium content of the whole plants in E. oryzicola”
Claim · model-written summary
Excess MgCl2 slightly reduced whole-plant calcium in rice.
- Taxon
- riceOryza sativae0
- Treatment
- excess MgCl2 treatmente0
- Outcome
- calcium content of the whole plantse0
- Direction
- slightlye0
- Qualifier
- slightly in ricee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The excess MgCl2 treatment greatly reduced the calcium content of the whole plants in E. oryzicola and slightly in rice”
Claim · model-written summary
Excess magnesium increased magnesium in rice shoots and roots.
- Taxon
- riceOryza sativae0
- Treatment
- excess Mg treatmente0
- Outcome
- Mg content of shoots and rootse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice, the excess Mg treatment increased the Mg content of shoots and roots”
Claim · model-written summary
Excess magnesium increased potassium and chloride in rice roots.
- Taxon
- riceOryza sativae0
- Treatment
- excess Mg treatmente0
- Outcome
- potassium and chloride contents of rootse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice, the excess Mg treatment increased the Mg content of shoots and roots, and the potassium and chloride contents of roots”
Claim · model-written summary
Excess magnesium slightly decreased calcium and potassium in rice shoots.
- Taxon
- riceOryza sativae0
- Treatment
- excess Mg treatmente0
- Outcome
- Ca and K contents of shootse0
- Direction
- slightly decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice, the excess Mg treatment increased the Mg content of shoots and roots, and the potassium and chloride contents of roots, but slightly decreased the Ca and K contents of shoots”
Claim · model-written summary
Excess magnesium increased potassium and chloride in E. oryzicola shoots.
- Taxon
- E. oryzicolaEchinochloa oryzicolae0
- Treatment
- excess Mg treatmente0
- Outcome
- K and Cl contents of shootse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“In E. oryzicola, the excess Mg treatment increased the K and Cl contents of shoots”
Claim · model-written summary
Excess magnesium increased magnesium and potassium in E. oryzicola roots.
- Taxon
- E. oryzicolaEchinochloa oryzicolae0
- Treatment
- excess Mg treatmente0
- Outcome
- Mg and K contents of rootse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“In E. oryzicola, the excess Mg treatment increased the K and Cl contents of shoots and the Mg and K contents of roots”
Claim · model-written summary
Excess magnesium slightly increased shoot magnesium in E. oryzicola.
- Taxon
- E. oryzicolaEchinochloa oryzicolae0
- Treatment
- excess Mg treatmente0
- Outcome
- Mg content of shootse0
- Direction
- slightly increasede0
Not reportedComparator
Verbatim
e0“In E. oryzicola, the excess Mg treatment increased the K and Cl contents of shoots and the Mg and K contents of roots, and slightly increased the Mg content of shoots”
Claim · model-written summary
Excess magnesium greatly decreased shoot calcium in E. oryzicola.
- Taxon
- E. oryzicolaEchinochloa oryzicolae0
- Treatment
- excess Mg treatmente0
- Outcome
- Ca content of shootse0
- Direction
- greatly decreasede0
Not reportedComparator
Verbatim
e0“In E. oryzicola, the excess Mg treatment increased the K and Cl contents of shoots and the Mg and K contents of roots, and slightly increased the Mg content of shoots, but greatly decreased the Ca content of shoots”
Claim · model-written summary
Rice was more tolerant than Echinochloa to excess magnesium.
- Taxon
- riceOryza sativae0
- Outcome
- tolerante0
- Direction
- more tolerante0
- Comparator
- Echinochloae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice is more tolerant than Echinochloa to excess Mg”
Claim · model-written summary
Tolerance to excess magnesium was related to calcium deficiency.
- Taxon
- riceOryza sativae0t0
- Outcome
- tolerancee0
- Qualifier
- related to Ca deficiencye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the tolerance is related to Ca deficiency”
t0“Rice and Echinochloa”
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