Abstract
Wheat ( Triticum aestivum L.) production areas are expanding to soils low in available Mn in southern Georgia and to soils high in available Mn in northern Georgia. Useful data on Mn deficient and toxic levels in leaf tissue for top growth and physiological processes in wheat are needed to evaluate growth processes limiting wheat production. The objectives of this study were to correlate Mn deficiency and toxicity levels with top dry weight production, photosynthesis, chlorophyll concentration, and transpiration. Wheat plants were grown in 10 experimental concentrations ranging from 0.09 μ M to 9.1 m M in nutrient solution. Photosynthesis and transpriration measurements were made on blade 1 of plants grown in the greanhouse. Total chlorophyll and Mn concentrations were determined on the experimental tissue after freeze‐drying. Foliar dry weights on a per pot (15 plants) basis were also determined. Severe Mn deficiency depressed top dry weight, photosynthesis, and total chlorophyll concentration, but transpiration was unaffected. Mild Mn toxicity reduced top dry weight but not photosynthesis, total chlorophyll concentration, or transpiration. Critical Mn deficiency levels for reducing top dry weight and apparent photosynthesis rates were similar, namely 0.23 and 0.30 mmol kg −1 , repectively. Growth reduction from Mn deficiency is possibly due to reduced photosynthesis. Minimum Mn requirements for chlorophyll (0.14 mmol kg −1 ) is about one‐half of that for top production. The critical Mn deficiency level for transpiration could not be determined. The critical Mn toxicity level for top dry weight occurred at 7 mmol kg −1 . Concentrations of 19, 19, and 24 mmol kg −1 were required for the depression of photosynthesis, total chlorophyll concentration, and transpiration, respectively. Maximum growth and yield are expected when the range of Mn concentration in blade 1 is 0.23 to 7 mmol kg −1 . The critical levels are prelimilinary values to be used in evaluating Mn status of field‐grown wheat for possible deficiency and toxicity.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 12
Claim · model-written summary
Severe Mn deficiency depressed top dry weight, photosynthesis and chlorophyll concentration.
- Taxon
- Wheat
Triticum aestivume1 - Treatment
- Severe Mn deficiencye0
- Outcome
- top dry weight, photosynthesis, and total chlorophyll concentratione0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe Mn deficiency depressed top dry weight, photosynthesis, and total chlorophyll concentration, but transpiration was unaffected.”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Severe Mn deficiency did not affect transpiration.
- Taxon
- WheatTriticum aestivume1
- Treatment
- Severe Mn deficiencye0
- Outcome
- transpiratione0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Severe Mn deficiency depressed top dry weight, photosynthesis, and total chlorophyll concentration, but transpiration was unaffected.”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Mild Mn toxicity reduced top dry weight.
- Taxon
- WheatTriticum aestivume1
- Treatment
- Mild Mn toxicitye0
- Outcome
- top dry weighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mild Mn toxicity reduced top dry weight but not photosynthesis, total chlorophyll concentration, or transpiration.”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Mild Mn toxicity did not reduce photosynthesis, chlorophyll concentration or transpiration.
- Taxon
- WheatTriticum aestivume1
- Treatment
- Mild Mn toxicitye0
- Outcome
- photosynthesis, total chlorophyll concentration, or transpiratione0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mild Mn toxicity reduced top dry weight but not photosynthesis, total chlorophyll concentration, or transpiration.”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Critical Mn deficiency for top dry weight was 0.23 mmol kg −1.
- Taxon
- WheatTriticum aestivume1
- Outcome
- top dry weighte0
- Direction
- reducinge0
- Value
- 0.23 and 0.30 mmol kg −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Critical Mn deficiency levels for reducing top dry weight and apparent photosynthesis rates were similar, namely 0.23 and 0.30 mmol kg −1 , repectively.”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Critical Mn deficiency for apparent photosynthesis was 0.30 mmol kg −1.
- Taxon
- WheatTriticum aestivume1
- Outcome
- apparent photosynthesis ratese0
- Direction
- reducinge0
- Value
- 0.30 mmol kg −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Critical Mn deficiency levels for reducing top dry weight and apparent photosynthesis rates were similar, namely 0.23 and 0.30 mmol kg −1 , repectively.”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
The minimum Mn requirement for chlorophyll was 0.14 mmol kg −1, about half that for top production.
- Taxon
- WheatTriticum aestivume1
- Outcome
- Minimum Mn requirements for chlorophylle0
- Value
- 0.14 mmol kg −1e0
- Comparator
- top productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Minimum Mn requirements for chlorophyll (0.14 mmol kg −1 ) is about one‐half of that for top production.”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
The critical Mn toxicity level for top dry weight was 7 mmol kg −1.
- Taxon
- WheatTriticum aestivume1
- Outcome
- top dry weighte0
- Value
- 7 mmol kg −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical Mn toxicity level for top dry weight occurred at 7 mmol kg −1 .”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Photosynthesis was depressed at a Mn concentration of 19 mmol kg −1.
- Taxon
- WheatTriticum aestivume1
- Outcome
- photosynthesise0
- Direction
- depressione0
- Value
- 19, 19, and 24 mmol kg −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of 19, 19, and 24 mmol kg −1 were required for the depression of photosynthesis, total chlorophyll concentration, and transpiration, respectively.”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Chlorophyll concentration was depressed at a Mn concentration of 19 mmol kg −1.
- Taxon
- WheatTriticum aestivume1
- Outcome
- total chlorophyll concentratione0
- Direction
- depressione0
- Value
- 19, 19, and 24 mmol kg −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of 19, 19, and 24 mmol kg −1 were required for the depression of photosynthesis, total chlorophyll concentration, and transpiration, respectively.”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Transpiration was depressed at a Mn concentration of 24 mmol kg −1.
- Taxon
- WheatTriticum aestivume1
- Outcome
- transpiratione0
- Direction
- depressione0
- Value
- 24 mmol kg −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of 19, 19, and 24 mmol kg −1 were required for the depression of photosynthesis, total chlorophyll concentration, and transpiration, respectively.”
e1“Wheat ( Triticum aestivum L.)”
Claim · model-written summary
Maximum wheat growth and yield are expected at blade 1 Mn concentrations of 0.23 to 7 mmol kg −1.
- Taxon
- WheatTriticum aestivume1
- Organ / stage
- blade 1e0
- Outcome
- Maximum growth and yielde0
- Value
- 0.23 to 7 mmol kg −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum growth and yield are expected when the range of Mn concentration in blade 1 is 0.23 to 7 mmol kg −1 .”
e1“Wheat ( Triticum aestivum L.)”
The same questions in other papers
manganese atom · growth · Triticum aestivum (wheat)Results differ
7 papers in the same direction as this paper · 24 in the opposite direction
- positive
- positive
- positive
28 papers more in this group
See all 32 papers →manganese atom · physiology: photosynthesis · Triticum aestivum (wheat)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- 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.