Abstract
We have investigated the way in which the radiation absorbed by leaves affects the rate of elongation of maize ( Zea mays L.) roots. In five repeated growth chamber experiments, plants previously grown at a photon irradiance of 23 mol m –2 d –1 received either 7 or 34 mol m –2 d –1 from day 10 to day 20 after germination. The elongation rate of primary roots steadily decreased for 4 d after reduction in irradiance and then stabilized at 60% of that in plants at high irradiance. The elongating zone was slightly shorter after 2 d at low irradiance, and was further reduced after 8 d. The concentrations of sucrose and glucose in the elongating zone were greatly decreased after 2 d at low irradiance and the gradient of both sugars was suppressed. The longer period at low irradiance affected neither sugar content nor gradient. In the same way, cell production rate was reduced after 2 d at low irradiance and was not appreciably decreased afterwards. The root zone with cell division was shorter in plants at low irradiance, but cell division rate remained nearly constant temporally and spatially, and was unaffected by the irradiance treatment. Our results suggest that primary events after a reduction in irradiance were a change in cell flux and sugar content in the elongating zone. Change in elongation rate was slower and probably the result of a time‐related developmental effect, which may be related to the change in cell production.
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Claims 9
Claim · model-written summary
Reduced irradiance decreased the elongation rate of maize primary roots, which stabilised at 60% of the rate under high irradiance.
- Organ / stage
- primary rootse1
- Treatment
- reduction in irradiancee1
- Outcome
- elongation rate of primary rootse1
- Direction
- decreasede1
- Value
- 60%e1
- Comparator
- plants at high irradiancee1
- Setting
- growth chamber experimentse2
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of elongation of maize ( Zea mays L.) roots”
e1“The elongation rate of primary roots steadily decreased for 4 d after reduction in irradiance and then stabilized at 60% of that in plants at high irradiance”
e2“In five repeated growth chamber experiments”
Claim · model-written summary
Under low irradiance the elongating zone of maize roots was slightly shorter after 2 d and further reduced after 8 d.
- Organ / stage
- elongating zonee3
- Treatment
- low irradiancee3
- Outcome
- elongating zonee3
- Direction
- shortere3
- Qualifier
- further reduced after 8 de3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of elongation of maize ( Zea mays L.) roots”
e3“The elongating zone was slightly shorter after 2 d at low irradiance, and was further reduced after 8 d”
Claim · model-written summary
Low irradiance greatly decreased the sucrose and glucose concentrations in the elongating zone of maize roots after 2 d.
- Organ / stage
- elongating zonee4
- Treatment
- low irradiancee4
- Outcome
- concentrations of sucrose and glucosee4
- Direction
- greatly decreasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of elongation of maize ( Zea mays L.) roots”
e4“The concentrations of sucrose and glucose in the elongating zone were greatly decreased after 2 d at low irradiance”
Claim · model-written summary
Low irradiance suppressed the sugar gradient in the elongating zone of maize roots.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of elongation of maize ( Zea mays L.) roots”
e5“after 2 d at low irradiance and the gradient of both sugars was suppressed”
Claim · model-written summary
A longer period at low irradiance affected neither the sugar content nor the sugar gradient of maize roots.
- Treatment
- longer period at low irradiancee6
- Outcome
- sugar contente6
- Direction
- no_changeinferrede6
- Qualifier
- nor gradiente6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of elongation of maize ( Zea mays L.) roots”
e6“The longer period at low irradiance affected neither sugar content nor gradient”
Claim · model-written summary
Cell production rate in maize roots was reduced after 2 d at low irradiance and was not appreciably decreased afterwards.
- Treatment
- low irradiancee7
- Outcome
- cell production ratee7
- Direction
- reducede7
- Qualifier
- was not appreciably decreased afterwardse7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of elongation of maize ( Zea mays L.) roots”
e7“cell production rate was reduced after 2 d at low irradiance and was not appreciably decreased afterwards”
Claim · model-written summary
The root zone with cell division was shorter in maize plants at low irradiance.
- Organ / stage
- root zonee7
- Treatment
- low irradiancee7
- Outcome
- root zone with cell divisione7
- Direction
- shortere7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of elongation of maize ( Zea mays L.) roots”
e7“The root zone with cell division was shorter in plants at low irradiance”
Claim · model-written summary
Cell division rate in maize roots stayed nearly constant and was unaffected by the irradiance treatment.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of elongation of maize ( Zea mays L.) roots”
e7“cell division rate remained nearly constant temporally and spatially, and was unaffected by the irradiance treatment”
Claim · model-written summary
The slower change in elongation rate is probably the result of a time-related developmental effect.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of elongation of maize ( Zea mays L.) roots”
e7“Change in elongation rate was slower and probably the result of a time‐related developmental effect”
The same questions in other papers
light · quality: sugar starch · Zea mays (maize)Positive and negative results
4 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 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.