Abstract
It has been confirmed that shading leaves from day 5 onwards lowers the rate of CO2 fixation when they are placed in saturating irradiances. The reduction due to shade treatment is about 46 per cent and a similar reduction in maximum chlorophyll content of the leaf follows shading. Maximum amounts of total soluble protein and of Fraction I protein are less in shaded leaves than in control leaves and prolonged treatment leads to a decline in leaf protein content. The relative amounts of different protein are also affected by treatment; in control leaves Fraction I protein accounts for about 45 per cent of the total but in shaded leaves the value is about 30 per cent. Increases and decreases in leaf protein amount, with concomitant changes in the ratio of Fraction I to total protein can be brought about by removing shades and re-applying them. Such changes can be induced even in fully expanded leaves in which net protein synthesis is not usually found. Maximal amounts of leaf protein are found in irradiances of 60 W m−2 or more, with lower values at lower light intensities. Where the first leaf is held in a stream of CO2-free air a lower level of protein is found. This, and the ratio of Fraction I to total protein, are similar to values for shaded leaves, and suggest the involvement of photosynthetic carbon fixation in determining leaf protein amount. A 1:1 linear correlation between amount of Fraction I protein and RuDP carboxylase activity is shown but the rate of CO2 incorporation by leaf extracts is 2–3 times greater than that of the intact leaf. The significance of this and the effect of irradiance on leaf protein amount are discussed.
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Claims 11
Claim · model-written summary
Shading from day 5 lowered leaf CO2 fixation at saturating irradiance by about 46 per cent.
- Taxon
- Barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- shading leaves from day 5 onwardse0
- Outcome
- rate of CO2 fixatione0
- Direction
- lowerse0
- Value
- 46 per cente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“shading leaves from day 5 onwards lowers the rate of CO2 fixation when they are placed in saturating irradiances. The reduction due to shade treatment is about 46 per cent”
t0“Barley”
Claim · model-written summary
Shading similarly reduced maximum leaf chlorophyll content.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- shadinge0
- Outcome
- maximum chlorophyll content of the leafe0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a similar reduction in maximum chlorophyll content of the leaf follows shading”
t0“Barley”
Claim · model-written summary
Shaded leaves had less maximum total soluble protein than control leaves.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- shaded leavese0
- Outcome
- total soluble proteine0
- Direction
- lesse0
- Comparator
- control leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum amounts of total soluble protein and of Fraction I protein are less in shaded leaves than in control leaves”
t0“Barley”
Claim · model-written summary
Shaded leaves had less maximum Fraction I protein than control leaves.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- shaded leavese0
- Outcome
- Fraction I proteine0
- Direction
- lesse0
- Comparator
- control leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum amounts of total soluble protein and of Fraction I protein are less in shaded leaves than in control leaves”
t0“Barley”
Claim · model-written summary
Prolonged shade led to declining leaf protein content.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- prolonged treatmente0
- Outcome
- leaf protein contente0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prolonged treatment leads to a decline in leaf protein content”
t0“Barley”
Claim · model-written summary
Fraction I protein comprised about 45 per cent of total protein in control leaves versus about 30 per cent in shaded leaves.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- shaded leavese0
- Outcome
- Fraction I proteine0
- Value
- 30 per cente0
- Qualifier
- 45 per cente0
- Comparator
- control leavese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in control leaves Fraction I protein accounts for about 45 per cent of the total but in shaded leaves the value is about 30 per cent”
t0“Barley”
Claim · model-written summary
Removing and reapplying shades changed leaf protein amount and the Fraction I to total protein ratio, even in fully expanded leaves.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- removing shades and re-applying theme0
- Outcome
- leaf protein amounte0
- Direction
- Increases and decreasese0
- Qualifier
- fully expanded leavese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increases and decreases in leaf protein amount, with concomitant changes in the ratio of Fraction I to total protein can be brought about by removing shades and re-applying them. Such changes can be induced even in fully expanded leaves”
t0“Barley”
Claim · model-written summary
Maximum leaf protein occurred at irradiance of 60 W m−2 or more, with lower values at lower intensities.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- leaf proteine0
- Direction
- Maximale0
- Value
- 60 W m−2e0
- Comparator
- lower light intensitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximal amounts of leaf protein are found in irradiances of 60 W m−2 or more, with lower values at lower light intensities”
t0“Barley”
Claim · model-written summary
CO2-free air lowered first-leaf protein to a level similar to shaded leaves.
- Taxon
- BarleyHordeum vulgaret0
- Organ / stage
- first leafe0
- Treatment
- stream of CO2-free aire0
- Outcome
- proteine0
- Direction
- lowere0
- Comparator
- shaded leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Where the first leaf is held in a stream of CO2-free air a lower level of protein is found. This, and the ratio of Fraction I to total protein, are similar to values for shaded leaves”
t0“Barley”
Claim · model-written summary
Fraction I protein amount correlated linearly 1:1 with RuDP carboxylase activity.
- Taxon
- BarleyHordeum vulgaret0
- Gene
- Fraction I proteine0
- Outcome
- RuDP carboxylase activitye0
- Value
- 1:1e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 1:1 linear correlation between amount of Fraction I protein and RuDP carboxylase activity is shown”
t0“Barley”
Claim · model-written summary
CO2 incorporation by leaf extracts was two to three times that of intact leaves.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- rate of CO2 incorporatione0
- Direction
- greatere0
- Value
- 2–3 timese0
- Comparator
- intact leafe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rate of CO2 incorporation by leaf extracts is 2–3 times greater than that of the intact leaf”
t0“Barley”
The same questions in other papers
shade · physiology: pigments · Hordeum vulgare (barley)Results agree
1 paper in the same direction as this paper
- no effect
co2 · quality: protein · Hordeum vulgare (barley)Results agree
6 papers in the same direction as this paper
- negative
- negative
- negative
3 papers more in this group
See all 7 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.