Claim · model-written summary
Transition from growth irradiance to high photoinhibitory irradiance doubled the CO2 assimilation rate of barley leaves within minutes.
- Taxon
- barley
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Hordeum vulgaree0 - Treatment
- high photoinhibitory irradiancee1
- Outcome
- CO(2) assimilation ratee1
- Direction
- doublede1
- Qualifier
- within minutese1
- Comparator
- growth irradiancee1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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Verbatim
e0“The response of the Benson-Calvin cycle to changes in irradiance and photoinhibition was measured in low-light grown barley (Hordeum vulgare) leaves”
e1“Upon the transition from the growth irradiance (280 micromoles per square meter per second) to a high photoinhibitory irradiance (1400 micromoles per square meter per second), the CO(2) assimilation rate of the leaves doubled within minutes”
Title
Marie Dujardyn; Christine H. Foyer PLANT PHYSIOLOGY 1989. doi:10.1104/pp.91.4.1562
Other claims from this paper (13)
- Intervention effect High irradiance rapidly reduced the quantum efficiency of barley leaves.
- Intervention effect Exposure to high light increased the activities of NADP-malate dehydrogenase and fructose-1,6-bisphosphatase in barley leaves to near maximum values.
- Intervention effect Exposure to high light increased the activation state of ribulose-1,5-bisphosphate carboxylase in barley leaves.
- Intervention effect Ribulose-1,5-bisphosphate carboxylase activity in barley leaves remained constant throughout photoinhibitory irradiance.
- Intervention effect The transient increase in fructose-1,6-bisphosphatase and NADP-malate dehydrogenase activities during photoinhibition was followed by a decrease to much lower values.
- Intervention effect Exposure to high light increased the leaf contents of glucose 6-phosphate and fructose 6-phosphate in barley.
- Intervention effect After high light exposure, the leaf contents of glucose 6-phosphate and fructose 6-phosphate subsequently decreased in barley.
- Intervention effect During photoinhibition the ATP content of barley leaves reached a constant value much higher than in low light.
- Intervention effect During photoinhibition the glycerate 3-phosphate content of barley leaves greatly increased.
- Intervention effect During photoinhibition the ribulose-1,5-bisphosphate content of barley leaves decreased.
- Intervention effect The fructose-1,6-bisphosphate and triose phosphate contents of barley leaves increased initially and then remained constant.
- Mechanism During photoinhibition CO2 assimilation in barley was limited by regeneration of ribulose-1,5-bisphosphate rather than by carboxylase activity, related to restricted reducing equivalents.
- Mechanism Photoinhibition suggests that sucrose synthesis in barley leaves exceeded the rate of carbon assimilation.