Abstract
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. Hourly and daily measurements made in an assimilation chamber (C 2 3A) showed important and lasting effects in root activity. After reduction of photosynthesis, it took approximately 2 hours to start a lowering of the uptake of NO 3 − and NH 4 + , three hours for K + and four hours for phosphate. Root respiration started to fall after 3 hours. The level to which these activities were reduced also varied. Phosphate uptake was reduced by a mean of 27%, nitrate uptake by 47%, and K + uptake by 55% while the root respiration was reduced by 55%. After return to the initial irradiance, root activities took 3 days to recover their initial rates. Shoot respiration was re‐established after one day, while the effects on photosynthesis and transpiration were immediate. The delay of the effect of a change of photosynthesis on the activities of the root, indicates the existence of considerable metabolic reserves. 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.
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Claims 14
Claim · model-written summary
Reducing irradiance to simulate a cloudy day had important and lasting effects on root activity in maize.
Zea maysNot reportedComparatorDirection
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“showed important and lasting effects in root activity”
Claim · model-written summary
After photosynthesis was reduced, it took about 2 hours before uptake of nitrate and ammonium started to fall in maize.
- Treatment
- reductions in irradiancee0
- Outcome
- uptake of NO 3 − and NH 4 +e1
- Direction
- loweringe1
- Value
- approximately 2 hourse1
Not reportedComparator
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“approximately 2 hours to start a lowering of the uptake of NO 3 − and NH 4 +”
Claim · model-written summary
After photosynthesis was reduced, it took three hours before K+ uptake started to fall in maize.
Not reportedComparator
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“approximately 2 hours to start a lowering of the uptake of NO 3 − and NH 4 + , three hours for K +”
Claim · model-written summary
After photosynthesis was reduced, it took four hours before phosphate uptake started to fall in maize.
Not reportedComparator
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“approximately 2 hours to start a lowering of the uptake of NO 3 − and NH 4 + , three hours for K + and four hours for phosphate”
Claim · model-written summary
Root respiration of maize started to fall after 3 hours of reduced irradiance.
Not reportedComparator
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“Root respiration started to fall after 3 hours”
Claim · model-written summary
Phosphate uptake of maize was reduced by a mean of 27% under reduced irradiance.
Not reportedComparator
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“Phosphate uptake was reduced by a mean of 27%, nitrate uptake by 47%, and K + uptake by 55% while the root respiration was reduced by 55%”
Claim · model-written summary
Nitrate uptake of maize was reduced by 47% under reduced irradiance.
Not reportedComparator
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“Phosphate uptake was reduced by a mean of 27%, nitrate uptake by 47%, and K + uptake by 55% while the root respiration was reduced by 55%”
Claim · model-written summary
K+ uptake of maize was reduced by 55% under reduced irradiance.
Not reportedComparator
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“Phosphate uptake was reduced by a mean of 27%, nitrate uptake by 47%, and K + uptake by 55% while the root respiration was reduced by 55%”
Claim · model-written summary
Root respiration of maize was reduced by 55% under reduced irradiance.
Not reportedComparator
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“Phosphate uptake was reduced by a mean of 27%, nitrate uptake by 47%, and K + uptake by 55% while the root respiration was reduced by 55%”
Claim · model-written summary
After irradiance returned to its initial level, maize root activities took 3 days to recover their initial rates.
Not reportedComparator
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“After return to the initial irradiance, root activities took 3 days to recover their initial rates”
Claim · model-written summary
After irradiance returned to its initial level, shoot respiration of maize was re-established after one day.
- Treatment
- reductions in irradiancee0
- Outcome
- Shoot respiratione1
- Direction
- re‐establishede1
- Value
- one daye1
Not reportedComparator
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“Shoot respiration was re‐established after one day”
Claim · model-written summary
The effects of reduced irradiance on photosynthesis and transpiration of maize were immediate.
Not reportedComparatorDirection
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“the effects on photosynthesis and transpiration were immediate”
Claim · model-written summary
The authors interpret the delayed effect of changed photosynthesis on root activities as indicating considerable metabolic reserves in maize.
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“The delay of the effect of a change of photosynthesis on the activities of the root, indicates the existence of considerable metabolic reserves”
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.
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”
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See all 57 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.