Abstract
Abstract Genotypic differences in tolerating toxic levels of heavy metals have been observed in various plant species. This research was conducted to study the effect of manganese (Mn), iron (Fe), calcium (Ca), and magnesium (Mg) accumulation on two tobacco genotypes, Tobacco Introduction (T.I.) 1112 and KY 14, that have exhibited different sensitivity to toxic levels of Mn. The investigation was carried out employing a solution culture technique in which combinations of three levels of Mn exposure at varying strengths and pH of an Hoagland solution were made. Increasing the strength of the Hoagland solution suppressed Mn uptake and the occurrence of Mn toxicity symptoms in both genotypes, suggesting the potential role of other ions on reducing Mn toxicity. A change in solution pH from 4.5 to 6.5 had no significant effect on the accumulation of Mn, Fe, Ca, and Mg in tobacco leaves as well as the occurrence of Mn toxicity symptoms in the tobacco plant. Accumulations of Mn, Fe, Ca and Mg were significantly higher in leaves of the Mn‐tolerant genotype (T.I. 1112) than in those of the Mn‐sensitive genotype (KY 14), but ratios of Mn/cation (cation denotes Fe or Ca or Mg) were almost the same in both genotypes. These data suggest that the difference between the Mn‐sensitive and Mn‐tolerant tobacco genotypes were not due to the simple imbalance of Mn in relation to Ca, Mg and Fe in the plant. Plant physiological studies are currently under way to elucidate this difference in Mn tolerance between the two genotypes.
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Claims 6
Claim · model-written summary
Increasing Hoagland solution strength suppressed manganese uptake in both tobacco genotypes.
- Taxon
- tobacco
Nicotiana tabacumt0 - Treatment
- Increasing the strength of the Hoagland solutione0
- Outcome
- Mn uptakee0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the strength of the Hoagland solution suppressed Mn uptake and the occurrence of Mn toxicity symptoms in both genotypes”
t0“tobacco genotypes”
Claim · model-written summary
Increasing Hoagland solution strength suppressed manganese toxicity symptoms in both tobacco genotypes.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- Increasing the strength of the Hoagland solutione0
- Outcome
- Mn toxicity symptomse0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the strength of the Hoagland solution suppressed Mn uptake and the occurrence of Mn toxicity symptoms in both genotypes”
t0“tobacco genotypes”
Claim · model-written summary
Changing solution pH from 4.5 to 6.5 had no significant effect on leaf Mn, Fe, Ca and Mg accumulation.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- leavese0
- Treatment
- solution pH from 4.5 to 6.5e0
- Outcome
- accumulation of Mn, Fe, Ca, and Mge0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A change in solution pH from 4.5 to 6.5 had no significant effect on the accumulation of Mn, Fe, Ca, and Mg in tobacco leaves”
Claim · model-written summary
Changing solution pH from 4.5 to 6.5 had no significant effect on manganese toxicity symptoms.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- solution pH from 4.5 to 6.5e0
- Outcome
- occurrence of Mn toxicity symptomse0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A change in solution pH from 4.5 to 6.5 had no significant effect on the accumulation of Mn, Fe, Ca, and Mg in tobacco leaves as well as the occurrence of Mn toxicity symptoms in the tobacco plant”
Claim · model-written summary
Leaves of T.I. 1112 accumulated significantly more Mn, Fe, Ca and Mg than KY 14 leaves.
Verbatim
e0“Accumulations of Mn, Fe, Ca and Mg were significantly higher in leaves of the Mn‐tolerant genotype (T.I. 1112) than in those of the Mn‐sensitive genotype (KY 14)”
Claim · model-written summary
Mn/cation ratios were almost the same in the two tobacco genotypes.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- ratios of Mn/catione0
- Direction
- almost the samee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ratios of Mn/cation (cation denotes Fe or Ca or Mg) were almost the same in both genotypes”
t0“tobacco genotypes”
The same questions in other papers
ph · molecular: metabolites · Nicotiana tabacum (tobacco)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- no effect
ph · crop injury · Nicotiana tabacum (tobacco)Results agree
1 paper in the same direction as this paper
- no effect
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.