Abstract
The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures. Leaf yellowing was observed 17 d after sowing when plants were grown in controlled environment chambers equipped with high-intensity discharge lamps at an irradiance of 800 μmol quanta m-2 s-1. The extent of leaf yellowing, measured as changes of total chlorophyll, increased when the CO2 partial pressure was raised from 37 to 70 Pa. Chlorosis was increased further by increasing the irradiance from 800 to 1100 μmol quanta m-2 s-1. Rates of photosynthetic O2 evolution by primary leaves, measured 17 d after sowing, were 20% lower for elevated compared with ambient CO2–grown plants. This result agreed with the level of chlorosis. However, soluble protein, Rubisco protein (ribulose, 1,5-bisphosphate carboxylase/oxygenase), and initial and total Rubisco activity 17 d after sowing were unaffected by CO2 enrichment and the extent of chlorosis. Leaf starch, sucrose, and glucose were increased by elevated CO2 treatment at almost every sampling. However, only glucose was correlated with leaf damage. Leaf yellowing also was observed on primary leaves of plants grown under microwave-powered sulfur lamps at 800 but not at 550 μmol quanta m-2 s-1. The extent of leaf yellowing on plants grown under microwave-powered sulfur lamps was unaffected by CO2 enrichment. It was concluded that leaf yellowing was influenced by irradiance, photoquality, and CO2 enrichment. Photobleaching of antenna chlorophyll, rather than premature senescence, was the most likely cause of visible leaf injury in barley.
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Claims 12
Claim · model-written summary
Leaf yellowing of barley primary leaves was observed 17 d after sowing in controlled environment chambers.
- Taxon
- Hordeum vulgare
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Hordeum vulgaree0 - Material
- cv. Brante0
- Organ / stage
- primary leavese0
- Outcome
- Leaf yellowinge1
- Setting
- controlled environment chamberse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures”
e1“Leaf yellowing was observed 17 d after sowing when plants were grown in controlled environment chambers”
Claim · model-written summary
Raising CO2 partial pressure from 37 to 70 Pa increased the extent of leaf yellowing in barley.
- Taxon
- Hordeum vulgareHordeum vulgaree0
- Treatment
- CO2 partial pressuree2
- Outcome
- extent of leaf yellowinge2
- Direction
- increasede2
- Comparator
- from 37e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures”
e2“The extent of leaf yellowing, measured as changes of total chlorophyll, increased when the CO2 partial pressure was raised from 37 to 70 Pa”
Claim · model-written summary
Increasing irradiance from 800 to 1100 further increased chlorosis of barley primary leaves.
- Taxon
- Hordeum vulgareHordeum vulgaree0
- Treatment
- irradiancee3
- Outcome
- Chlorosise3
- Direction
- increased furthere3
- Comparator
- from 800e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures”
e3“Chlorosis was increased further by increasing the irradiance from 800 to 1100”
Claim · model-written summary
Elevated CO2 lowered photosynthetic O2 evolution of barley primary leaves by 20% relative to ambient CO2.
- Taxon
- Hordeum vulgareHordeum vulgaree0
- Organ / stage
- primary leavese4
- Treatment
- elevatede4
- Outcome
- photosynthetic O2 evolutione4
- Direction
- lowere4
- Value
- 20%e4
- Comparator
- ambient CO2e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures”
e4“Rates of photosynthetic O2 evolution by primary leaves, measured 17 d after sowing, were 20% lower for elevated compared with ambient CO2”
Claim · model-written summary
CO2 enrichment did not change soluble protein of barley leaves 17 d after sowing.
- Taxon
- Hordeum vulgareHordeum vulgaree0
- Treatment
- CO2 enrichmente5
- Outcome
- soluble proteine5
- Direction
- unaffectede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures”
e5“However, soluble protein, Rubisco protein (ribulose, 1,5-bisphosphate carboxylase/oxygenase), and initial and total Rubisco activity 17 d after sowing were unaffected by CO2 enrichment”
Claim · model-written summary
CO2 enrichment did not change Rubisco protein of barley leaves 17 d after sowing.
- Taxon
- Hordeum vulgareHordeum vulgaree0
- Treatment
- CO2 enrichmente5
- Outcome
- Rubisco proteine5
- Direction
- unaffectede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures”
e5“However, soluble protein, Rubisco protein (ribulose, 1,5-bisphosphate carboxylase/oxygenase), and initial and total Rubisco activity 17 d after sowing were unaffected by CO2 enrichment”
Claim · model-written summary
CO2 enrichment did not change initial and total Rubisco activity of barley leaves 17 d after sowing.
- Taxon
- Hordeum vulgareHordeum vulgaree0
- Treatment
- CO2 enrichmente5
- Outcome
- initial and total Rubisco activitye5
- Direction
- unaffectede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures”
e5“However, soluble protein, Rubisco protein (ribulose, 1,5-bisphosphate carboxylase/oxygenase), and initial and total Rubisco activity 17 d after sowing were unaffected by CO2 enrichment”
Claim · model-written summary
Elevated CO2 treatment increased leaf starch, sucrose and glucose of barley at almost every sampling.
- Taxon
- Hordeum vulgareHordeum vulgaree0
- Treatment
- elevated CO2 treatmente6
- Outcome
- Leaf starch, sucrose, and glucosee6
- Direction
- increasede6
- Qualifier
- at almost every samplinge6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures”
e6“Leaf starch, sucrose, and glucose were increased by elevated CO2 treatment at almost every sampling”
Claim · model-written summary
Only leaf glucose of barley was correlated with leaf damage.
- Taxon
- Hordeum vulgareHordeum vulgaree0
- Compound
- glucosee7
- Outcome
- leaf damagee7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures”
e7“However, only glucose was correlated with leaf damage”
Claim · model-written summary
Barley leaves grown under microwave-powered sulfur lamps at 800 showed yellowing, not seen at 550.
- Taxon
- Hordeum vulgareHordeum vulgaree0
- Treatment
- microwave-powered sulfur lamps at 800e1
- Outcome
- Leaf yellowinge1
- Comparator
- 550e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures”
e1“Leaf yellowing also was observed on primary leaves of plants grown under microwave-powered sulfur lamps at 800 but not at 550”
Claim · model-written summary
CO2 enrichment did not change the extent of leaf yellowing under microwave-powered sulfur lamps.
- Taxon
- Hordeum vulgareHordeum vulgaree0
- Treatment
- CO2 enrichmente1
- Outcome
- extent of leaf yellowinge1
- Direction
- unaffectede1
- Qualifier
- on plants grown under microwave-powered sulfur lampse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The development of chlorosis was studied in primary leaves of barley plants (Hordeum vulgare L. cv. Brant) grown at ambient and twice-ambient CO2 partial pressures”
e1“The extent of leaf yellowing on plants grown under microwave-powered sulfur lamps was unaffected by CO2 enrichment”
Claim · model-written summary
Photobleaching of antenna chlorophyll, rather than premature senescence, is the most likely cause of barley visible leaf injury.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- visible leaf injurye1
- Qualifier
- Photobleaching of antenna chlorophyll, rather than premature senescencee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Photobleaching of antenna chlorophyll, rather than premature senescence, was the most likely cause of visible leaf injury in barley”
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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.