Claim · model-written summary
The authors conclude that maize root metabolism depends on photosynthetic assimilates over longer periods but mainly on metabolic reserves in the short term.
Zea maysNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the growth of maize ( Zea mays L.cv. INRA F 7 × F 2 ) under constant climatic conditions, the effects of reductions in irradiance simulating a cloudy day were studied”
e1“Over longer periods, root metabolism depends on photosynthetic assimilates, but in the short term it is much more dependent on the level of metabolic reserves than on the direct flow of photosynthetic translocates”
Title
The effect of a day at low irradiance of a maize crop
D. Massimino; M. André; C. Richaud; et al. Physiologia Plantarum 1981. doi:10.1111/j.1399-3054.1981.tb00894.x
Other claims from this paper (13)
- Intervention effect Reducing irradiance to simulate a cloudy day had important and lasting effects on root activity in maize.
- Intervention effect After photosynthesis was reduced, it took about 2 hours before uptake of nitrate and ammonium started to fall in maize.
- Intervention effect After photosynthesis was reduced, it took three hours before K+ uptake started to fall in maize.
- Intervention effect After photosynthesis was reduced, it took four hours before phosphate uptake started to fall in maize.
- Intervention effect Root respiration of maize started to fall after 3 hours of reduced irradiance.
- Intervention effect Phosphate uptake of maize was reduced by a mean of 27% under reduced irradiance.
- Intervention effect Nitrate uptake of maize was reduced by 47% under reduced irradiance.
- Intervention effect K+ uptake of maize was reduced by 55% under reduced irradiance.
- Intervention effect Root respiration of maize was reduced by 55% under reduced irradiance.
- Intervention effect After irradiance returned to its initial level, maize root activities took 3 days to recover their initial rates.
- Intervention effect After irradiance returned to its initial level, shoot respiration of maize was re-established after one day.
- Intervention effect The effects of reduced irradiance on photosynthesis and transpiration of maize were immediate.
- Mechanism The authors interpret the delayed effect of changed photosynthesis on root activities as indicating considerable metabolic reserves in maize.