Abstract
Dependence of seed yield on sink capacity and matter supply from the source was examined in individual pods of rape plants (Brassica napus L., cv. Norin No. 16) grown in a field. The effects of matter supply from the source were examined grading light intensity by shading treatments in the ripening period. The effects of sink capacity were analyzed based on the individual variation of seed number that occurred naturaly in a pod. Seed yield and sink capacity were expressed as those based on unit surface area of pod and termed "relative seed yield" and "relative sink capacity" respectively. Aspects of variation in relative sink capacity in the "pod layer" were also examined. The results obtained are summarized as follows: 1. Under natural light (no shading), relative seed yield increased linearly with relative sink capacity, suggesting that seed yield was determined by sink capacity of pod. Under lower light intensities (72% and 44% of natural light), relative seed yield increased with relative sink capacity only in the case where the latter was small. Above a critical point, the increase in relative sink capacity did not result in an increase of relative seed yield any more, showing that seed yield was determined by matter supply from the source in this situation. The critical point of the relative sink capacity lowered with decreasing light intensity (Fig. 1). 2. Relative seed yield increased with light intensity, the rate of increment was larger at the larger relative sink capacity (Fig. 2). 3. Since pods located at higher levels of the pod layer are exposed to strong light, it is desirable that the relative sink capacities of those pods are large. However, the acutual vertical distribution of relative sink capacity in a pod layer wes just the opposite to this (Figs. 3 and 4). 4. There was a fairly close positive correlation between percentage of seed-setting and relative sink capacity. Thus, improving seed-setting in pods at higher levels of the pod layer was considered to be effective for increasing seed yield (Fig. 5).
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Claims 8
Claim · model-written summary
Under natural light, relative seed yield increased linearly with relative sink capacity.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse0 - Material
- cv. Norin No. 16e0
- Outcome
- relative seed yielde1
- Direction
- increasede1
- Qualifier
- linearly with relative sink capacitye1
- Setting
- in a fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“rape plants (Brassica napus L., cv. Norin No. 16) grown in a field”
e1“Under natural light (no shading), relative seed yield increased linearly with relative sink capacity”
Claim · model-written summary
Under lower light intensities (72% and 44% of natural light), relative seed yield increased with relative sink capacity only when the latter was small.
- Taxon
- Brassica napusBrassica napuse0
- Material
- cv. Norin No. 16e0
- Treatment
- lower light intensities (72% and 44% of natural light)e2
- Outcome
- relative seed yielde2
- Direction
- increasede2
- Qualifier
- only in the case where the latter was smalle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rape plants (Brassica napus L., cv. Norin No. 16) grown in a field”
e2“Under lower light intensities (72% and 44% of natural light), relative seed yield increased with relative sink capacity only in the case where the latter was small”
Claim · model-written summary
Above a critical point of relative sink capacity, further increases in sink capacity did not increase relative seed yield under lower light.
- Taxon
- Brassica napusBrassica napuse0
- Material
- cv. Norin No. 16e0
- Treatment
- relative sink capacitye3
- Outcome
- relative seed yielde3
- Direction
- did not result in an increasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rape plants (Brassica napus L., cv. Norin No. 16) grown in a field”
e3“Above a critical point, the increase in relative sink capacity did not result in an increase of relative seed yield any more”
Claim · model-written summary
The critical point of relative sink capacity lowered with decreasing light intensity.
- Taxon
- Brassica napusBrassica napuse0
- Material
- cv. Norin No. 16e0
- Treatment
- decreasing light intensitye4
- Outcome
- critical point of the relative sink capacitye4
- Direction
- lowerede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rape plants (Brassica napus L., cv. Norin No. 16) grown in a field”
e4“The critical point of the relative sink capacity lowered with decreasing light intensity”
Claim · model-written summary
Relative seed yield increased with light intensity, and the rate of increase was larger at larger relative sink capacity.
- Taxon
- Brassica napusBrassica napuse0
- Material
- cv. Norin No. 16e0
- Treatment
- light intensitye5
- Outcome
- Relative seed yielde5
- Direction
- increasede5
- Qualifier
- the rate of increment was larger at the larger relative sink capacitye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rape plants (Brassica napus L., cv. Norin No. 16) grown in a field”
e5“Relative seed yield increased with light intensity, the rate of increment was larger at the larger relative sink capacity”
Claim · model-written summary
The actual vertical distribution of relative sink capacity in the pod layer was opposite to the desirable distribution (large sink capacity at higher, light-exposed pods).
- Taxon
- Brassica napusBrassica napuse0
- Organ / stage
- pod layere6
- Outcome
- vertical distribution of relative sink capacitye6
- Direction
- just the oppositee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rape plants (Brassica napus L., cv. Norin No. 16) grown in a field”
e6“it is desirable that the relative sink capacities of those pods are large. However, the acutual vertical distribution of relative sink capacity in a pod layer wes just the opposite to this”
Claim · model-written summary
Percentage of seed-setting was positively correlated with relative sink capacity.
- Taxon
- Brassica napusBrassica napuse0
- Treatment
- relative sink capacitye7
- Outcome
- percentage of seed-settinge7
- Direction
- positivee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rape plants (Brassica napus L., cv. Norin No. 16) grown in a field”
e7“There was a fairly close positive correlation between percentage of seed-setting and relative sink capacity”
Claim · model-written summary
Improving seed-setting in pods at higher levels of the pod layer was considered effective for increasing seed yield.
- Taxon
- Brassica napusBrassica napuse0
- Outcome
- improving seed-setting in pods at higher levels of the pod layere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rape plants (Brassica napus L., cv. Norin No. 16) grown in a field”
e1“improving seed-setting in pods at higher levels of the pod layer was considered to be effective for increasing seed yield”