Claim · model-written summary
Several photosynthetic enzymes were unaltered by low temperature and light in sorghum or maize.
- Treatment
- low temperatures (10 C) and light (170 w m(-2))e0
- Outcome
- activity of several photosynthetic enzymese0
- Direction
- unalterede0
Sorghum
Zea maysNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity of several photosynthetic enzymes was unaltered by exposure of sorghum or maize to low temperatures (10 C) and light (170 w m(-2))”
Title
Anthony O. Taylor; C. Roger Slack; Hugh G. McPherson PLANT PHYSIOLOGY 1974. doi:10.1104/pp.54.5.696
Other claims from this paper (14)
- Intervention effect NADP-malate dehydrogenase activity was reduced under low temperature and light.
- Intervention effect Pyruvate Pi dikinase activity was reduced under low temperature and light.
- Mechanism The reduction in enzyme activity was largely attributed to loss of enzyme.
- Association NADP-malate dehydrogenase loss was greater in sorghum than maize.
- Intervention effect No NADP-malate dehydrogenase loss occurred in either species at 10 C with reduced light.
- Intervention effect Maize leaf catalase activity declined with low temperature in light.
- Intervention effect Pyruvate Pi dikinase activation after illumination was slower at 10 C than 25 C.
- Intervention effect Low temperature had no immediate measurable effect on NADP-malate dehydrogenease activation in vivo.
- Observation In vitro tests showed a similar differential temperature effect on the two enzymes.
- Observation Arrhenius plots revealed further low temperature sensitivity of pyruvate Pi dikinase in sorghum and maize.
- Intervention effect Activation energy of pyruvate Pi dikinase sharply increased below 12 C with or without Triton X-100.
- Intervention effect Activation energies of five other maize leaf enzymes did not change from 6 to 30 C.
- Association Lower temperature similarly slowed pyruvate Pi dikinase activation, photosynthesis and stomatal opening responses.
- Observation Pyruvate Pi dikinase activation slightly preceded rising photosynthesis rates.