Abstract
Wheat and barley grass were raised as seedlings in aerated solution cultures under high-pressure sodium vapour lamps in a growth cabinet. Manganese and copper were provided over a wide span of concentrations to induce a range in deficiency symptom expression. Plant response was documented in terms of biomass gain, in vivo chlorophyll fluorescence, CO2-saturated O2 evolution by leaf slices, single leaf H2O/CO2 exchange and A(pI) curves (assimilation as a function of intercellular CO2 partial pressure) at saturating light. Photosynthetic dysfunction due to trace element deficiency lowered O2 evolution (both area and chlorophyll basis) and slowed down leaf gas exchange. Both initial slope and CO2-saturated phases of A(pi) curves were similarly affected in the two species under either Cu or Mn deficiency. Induction kinetics of in vivo chlorophyll fluorescence proved distinctive for both species. Mn deficiency was often manifest as increased constant-yield (Fo) in combination with much reduced variable fluorescence (Fv). Increased ratio of Fo/ Fv was confirmed as a useful index for early diagnosis of Mn deficiency regardless of leaf Cu status. Barley grass (both H. glaucum Steud. and H. leporinum Link) was more tolerant of low Mn and Cu status than wheat, especially in terms of growth and photosynthetic response to Mn deficiency. Wheat plants made little growth once Mn supply was reduced to 10% of control level whereas barley grass was only moderately constrained.
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Claims 9
Claim · model-written summary
Trace element deficiency lowered leaf oxygen evolution in wheat and barley grass.
- Taxon
- Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )t0
- Treatment
- trace element deficiencye0
- Outcome
- O2 evolution (both area and chlorophyll basis)e0
- Direction
- lowerede0
Not reportedComparator
Verbatim
e0“Photosynthetic dysfunction due to trace element deficiency lowered O2 evolution (both area and chlorophyll basis)”
t0“Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )”
Claim · model-written summary
Trace element deficiency slowed leaf gas exchange in wheat and barley grass.
- Taxon
- Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )t0
- Treatment
- trace element deficiencye0
- Outcome
- leaf gas exchangee0
- Direction
- slowed downe0
Not reportedComparator
Verbatim
e0“Photosynthetic dysfunction due to trace element deficiency lowered O2 evolution (both area and chlorophyll basis) and slowed down leaf gas exchange”
t0“Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )”
Claim · model-written summary
Both phases of assimilation curves were similarly affected in the two species under either deficiency.
- Taxon
- Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )t0
- Treatment
- Cu or Mn deficiencye0
- Outcome
- initial slope and CO2-saturated phases of A(pi) curvese0
Not reportedComparatorDirection
Verbatim
e0“Both initial slope and CO2-saturated phases of A(pi) curves were similarly affected in the two species under either Cu or Mn deficiency.”
t0“Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )”
Claim · model-written summary
Chlorophyll fluorescence induction kinetics distinguished the two species.
Verbatim
e0“Induction kinetics of in vivo chlorophyll fluorescence proved distinctive for both species.”
t0“Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )”
Claim · model-written summary
Manganese deficiency often increased constant-yield fluorescence.
- Taxon
- Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )t0
- Treatment
- Mn deficiencye0
- Outcome
- constant-yield (Fo)e0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Mn deficiency was often manifest as increased constant-yield (Fo) in combination with much reduced variable fluorescence (Fv).”
t0“Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )”
Claim · model-written summary
Manganese deficiency markedly reduced variable fluorescence.
- Taxon
- Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )t0
- Treatment
- Mn deficiencye0
- Outcome
- variable fluorescence (Fv)e0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Mn deficiency was often manifest as increased constant-yield (Fo) in combination with much reduced variable fluorescence (Fv).”
t0“Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )”
Claim · model-written summary
The increased Fo/Fv ratio was useful for early diagnosis of manganese deficiency regardless of copper status.
- Taxon
- Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )t0
- Outcome
- useful index for early diagnosis of Mn deficiencye0
- Qualifier
- regardless of leaf Cu statuse0
Not reportedComparatorValue
Verbatim
e0“Increased ratio of Fo/ Fv was confirmed as a useful index for early diagnosis of Mn deficiency regardless of leaf Cu status.”
t0“Wheat ( Triticum aestivum ) and Barley Grass ( Hordeum glaucum and H. leporinum )”
Claim · model-written summary
Barley grass tolerated low manganese and copper status better than wheat.
Verbatim
e0“Barley grass (both H. glaucum Steud. and H. leporinum Link) was more tolerant of low Mn and Cu status than wheat, especially in terms of growth and photosynthetic response to Mn deficiency.”
Claim · model-written summary
Wheat grew little at 10% of control manganese supply, while barley grass was moderately constrained.
- Taxon
- Wheat
Triticum aestivume0 - Treatment
- Mn supply was reduced to 10% of control levele0
- Outcome
- growthe0
- Direction
- littlee0
- Value
- 10% of control levele0
- Comparator
- barley grasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat plants made little growth once Mn supply was reduced to 10% of control level whereas barley grass was only moderately constrained.”
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 →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.