Abstract
Whole bean plants, ev. Cockfield, grown in pots crowded or well‐spaced (50 or 10 plants m 2 , respectively) were treated with 14 CO 2 at the pod‐fill stage (25 modes) and the radioactivity in each leaf was determined after 30 min. With spaced plants the uptake was greatest in the mid‐stem leaves and was proportional to leaf area. In contrast, 70% of the total assimilation took place in the upper six leaves of crowded plants and there was a steady decrease down the stem. When 14 CO 2 was fed to single leaves of similar crowded plants the resultant distribution of labelled assimilates varied with the position of the treated leaf. After 6 h, 67% of the 14 C fixed by a mid‐stem leaf (node 13) was recovered from the beans, whereas 76% of that from an upper leaf (node 23) had accumulated along the stem. Due to the shading of mid‐stem leaves at the higher planting densities, seed yield becomes increasingly dependent upon re‐distribution of assimilates from stem to beans.
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Claims 8
Claim · model-written summary
In spaced bean plants, carbon uptake was greatest in mid-stem leaves.
- Taxon
- Vicia faba
Vicia fabat0 - Organ / stage
- mid‐stem leavese0
- Outcome
- uptakee0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With spaced plants the uptake was greatest in the mid‐stem leaves”
t0“field bean, Vicia faba”
Claim · model-written summary
In spaced bean plants, carbon uptake was proportional to leaf area.
- Taxon
- Vicia fabaVicia fabat0
- Organ / stage
- leaf areae0
- Outcome
- uptakee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With spaced plants the uptake was greatest in the mid‐stem leaves and was proportional to leaf area.”
t0“field bean, Vicia faba”
Claim · model-written summary
In crowded bean plants, upper six leaves accounted for 70% of total assimilation.
- Taxon
- Vicia fabaVicia fabat0
- Organ / stage
- upper six leavese0
- Outcome
- total assimilatione0
- Value
- 70%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“70% of the total assimilation took place in the upper six leaves of crowded plants”
t0“field bean, Vicia faba”
Claim · model-written summary
Assimilation in crowded bean plants decreased down the stem.
- Taxon
- Vicia fabaVicia fabat0
- Outcome
- steady decrease down the steme0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a steady decrease down the stem”
t0“field bean, Vicia faba”
Claim · model-written summary
Distribution of labelled assimilates varied by position of the treated bean leaf.
- Taxon
- Vicia fabaVicia fabat0
- Organ / stage
- treated leafe0
- Outcome
- distribution of labelled assimilatese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the resultant distribution of labelled assimilates varied with the position of the treated leaf”
t0“field bean, Vicia faba”
Claim · model-written summary
After 6 h, 67% of carbon fixed by a mid-stem bean leaf was recovered from beans.
- Taxon
- Vicia fabaVicia fabat0
- Organ / stage
- mid‐stem leafe0
- Outcome
- 14 C fixed by a mid‐stem leaf (node 13) was recovered from the beanse0
- Value
- 67%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 6 h, 67% of the 14 C fixed by a mid‐stem leaf (node 13) was recovered from the beans”
t0“field bean, Vicia faba”
Claim · model-written summary
After 6 h, 76% of carbon fixed by an upper bean leaf accumulated along the stem.
- Taxon
- Vicia fabaVicia fabat0
- Organ / stage
- upper leafe0
- Outcome
- accumulated along the steme0
- Value
- 76%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“76% of that from an upper leaf (node 23) had accumulated along the stem”
t0“field bean, Vicia faba”
Claim · model-written summary
The authors infer that higher density shading makes bean seed yield more dependent on stem-to-bean assimilate redistribution.
- Taxon
- Vicia fabaVicia fabat0
- Outcome
- seed yield becomes increasingly dependent upon re‐distribution of assimilates from stem to beanse0
- Qualifier
- shading of mid‐stem leaves at the higher planting densitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Due to the shading of mid‐stem leaves at the higher planting densities, seed yield becomes increasingly dependent upon re‐distribution of assimilates from stem to beans.”
t0“field bean, Vicia faba”