Abstract
Abstract A field experiment was conducted to evaluate the effect of long‐term exogenous sucrose supply on aspects of corn plant physiology and development during the grain filling period. Concentrated sucrose solution was supplied to corn ( Zea mays L.) stems by an injection technique. This injection technique delivered pressurized solutions through syringe needles sealed to the stem with latex. The pressure was applied to the syringe plunger with ceramic construction bricks. Solutions containing sucrose at 0, 150, and 300 g L −1 were injected over a 32 day period encompassing the duration of the active grain filling period. The primary ears of plants injected with sucrose produced approximately 50% more kernels and 30% more grain weight than those injected with distilled water. The injected internode was also considerably heavier (56%) for plants receiving 300 g sucrose L −1 than plants receiving distilled water. For all measured variables, plants injected with distilled water were either not different from or had larger values than the non‐injected controls. After one week sucrose injection caused photo‐synthetic inhibition (as measured by chlorophyll fluorescence) in the leaf just above the ear and the ear leaf, and this was more severe for plants receiving 300 g sucrose L −1 than for those receiving 150 g sucrose L −1 . For sucrose injected plants, the increased size of the primary ear was concomitant with a large decrease in grain production by the secondary ear and an overall decrease in per plant grain production. These results suggest that the mechanisms for signalling between sinks (the primary and secondary ears) and the primary sink and the source (leaves) are different.
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Claims 9
Claim · model-written summary
Sucrose injection increased primary-ear kernel number about 50% versus distilled water.
- Taxon
- corn
Zea mays subsp. mayse1 - Organ / stage
- primary earse0
- Treatment
- injected with sucrosee0
- Outcome
- kernelse0
- Direction
- moree0
- Value
- 50%e0
- Comparator
- distilled watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The primary ears of plants injected with sucrose produced approximately 50% more kernels and 30% more grain weight than those injected with distilled water”
e1“corn ( Zea mays L.)”
Claim · model-written summary
Sucrose injection increased primary-ear grain weight about 30% versus distilled water.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- injected with sucrosee0
- Outcome
- grain weighte0
- Direction
- moree0
- Value
- 30%e0
- Comparator
- distilled watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The primary ears of plants injected with sucrose produced approximately 50% more kernels and 30% more grain weight than those injected with distilled water”
e1“corn ( Zea mays L.)”
Claim · model-written summary
At 300 g sucrose L −1, the injected internode was 56% heavier than with distilled water.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- 300 g sucrose L −1e0
- Outcome
- injected internodee0
- Direction
- heaviere0
- Value
- 56%e0
- Comparator
- distilled watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Plants”
e0“The injected internode was also considerably heavier (56%) for plants receiving 300 g sucrose L −1 than plants receiving distilled water”
Claim · model-written summary
Distilled-water injection gave values equal to or above uninjected controls for all measured corn variables.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- injected with distilled watere0
- Outcome
- all measured variablese0
- Direction
- not different from or had larger valuese0
- Comparator
- non‐injected controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Plants”
e0“For all measured variables, plants injected with distilled water were either not different from or had larger values than the non‐injected controls”
Claim · model-written summary
After one week, sucrose injection inhibited photosynthesis in the leaf above the ear and ear leaf.
- Taxon
- CornZea mays subsp. mayst0
- Organ / stage
- leaf just above the ear and the ear leafe0
- Treatment
- sucrose injectione0
- Outcome
- photo‐synthetic inhibitione0
- Direction
- inhibitione0
- Qualifier
- After one weeke0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Plants”
e0“After one week sucrose injection caused photo‐synthetic inhibition (as measured by chlorophyll fluorescence) in the leaf just above the ear and the ear leaf”
Claim · model-written summary
Photosynthetic inhibition was greater with 300 than 150 g sucrose L −1.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- 300 g sucrose L −1e0
- Outcome
- more severee0
- Direction
- more severee0
- Comparator
- 150 g sucrose L −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Plants”
e0“this was more severe for plants receiving 300 g sucrose L −1 than for those receiving 150 g sucrose L −1”
Claim · model-written summary
Sucrose injection reduced secondary-ear grain production.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- sucrose injectede0
- Outcome
- grain production by the secondary eare0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Plants”
e0“For sucrose injected plants, the increased size of the primary ear was concomitant with a large decrease in grain production by the secondary ear”
Claim · model-written summary
Sucrose injection reduced total grain production per plant.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- sucrose injectede1
- Outcome
- per plant grain productione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Plants”
e0“an overall decrease in per plant grain production”
e1“sucrose injected plants”
Claim · model-written summary
The authors infer different signaling mechanisms between ear sinks and between the primary ear and leaves.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- mechanisms for signallinge0
- Qualifier
- between sinks (the primary and secondary ears) and the primary sink and the source (leaves)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Plants”
e0“the mechanisms for signalling between sinks (the primary and secondary ears) and the primary sink and the source (leaves) are different”
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See all 73 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.