Claim · model-written summary
Canopy photosynthesis at saturating light intensity was reduced by more than 80% in stressed simulated ryegrass swards.
- Taxon
- perennial ryegrass
Lolium perennee0 - Treatment
- stressede2
- Outcome
- Canopy photosynthesis at saturating light intensitye1
- Direction
- reducede1
- Value
- more than 80%e2
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“swards of perennial ryegrass”
e1“Canopy photosynthesis at saturating light intensity was reduced”
e2“by more than 80% in the stressed simulated swards”
Title
Water stress in field‐grown perennial ryegrass.
M. B. JONES; E. L. LEAFE; W. STILES Annals of Applied Biology 1980. doi:10.1111/j.1744-7348.1980.tb04772.x
Other claims from this paper (11)
- Observation Daily minimum leaf water potential in irrigated perennial ryegrass swards fell to -12 bars (-1.2 MPa).
- Observation Daily minimum leaf water potential in stressed field perennial ryegrass swards fell to -16 bars.
- Observation Daily minimum leaf water potential in stressed simulated perennial ryegrass swards fell to -20 bars.
- Intervention effect Dry-matter production was reduced in the water-stressed field ryegrass swards.
- Intervention effect Leaf extension declined markedly under water stress in both field and simulated ryegrass swards.
- Intervention effect Canopy photosynthesis at saturating light intensity was reduced by about half in stressed field ryegrass swards.
- Intervention effect The mean rate of leaf photosynthesis at saturating light intensity (Pmax/LAI) was reduced by about 40% in stressed field swards.
- Mechanism The reduction in leaf photosynthesis per unit leaf area in stressed field swards was attributed to increased stomatal resistance.
- Mechanism The more marked photosynthesis decline in stressed simulated swards resulted both from more complete stomatal closure and from a decrease in the quantum efficiency of photosynthesis.
- Mechanism When water stress occurs naturally in the field, changes in the leaves develop as stress develops and result in a less severe effect of water stress on leaf photosynthesis.
- Mechanism When stress is imposed with unnatural rapidity, as in simulated swards, the leaf has no opportunity to change and stress leads to a rapid and severe decline in leaf photosynthesis.