Claim · model-written summary
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.
- Taxon
- perennial ryegrass
Lolium perennee0 - Outcome
- rapid and severe decline in leaf photosynthesise1
- Qualifier
- no opportunity for these changes in the leaf to occure1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“swards of perennial ryegrass”
e1“When stress is imposed with unnatural rapidity, as in the simulated swards, there is no opportunity for these changes in the leaf to occur and stress leads to a rapid and severe decline in leaf photosynthesis”
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 Canopy photosynthesis at saturating light intensity was reduced by more than 80% in stressed simulated 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.