Abstract
The influence of plant population density on spectral distribution of light received by wheat ( Triticum aestivum L. cv. Coker 797) seedlings was measured under field conditions, and effects of red and far‐red light on tillering and photosynthate partitioning were studied in controlled environments. Spectral distribution of light was measured in sunflecks at soil level in close‐, intermediate‐, and wide‐spaced field populations during the tillering stage. Close‐spaced seedlings received higher far‐red/red light ratios than wide‐spaced plants because of the larger amount of far‐red reflected from green leaves of the more numerous nearby plants. The far‐red/red light ratios in all population densities were higher in late afternoon than at noon. Close‐spaced plants developed fewer tillers, less roots and longer leaves than wide‐spaced seedlings under field conditions. In controlled environments, a higher far‐red/red ratio during photosynthetic periods resulted in fewer tillers and longer leaves; whereas, brief red or far‐red exposures at the end of each day had a more pronounced effect. Wheat seedlings that received 5‐min exposures to far‐red light at the end of the photosynthetic period each day for 20 consecutive days developed fewer tillers, longer leaves, less roots, and a higher shoot/root biomass ratio. The effects of far‐red light were reversed by red light. The light spectral shifts associated with field plant population densities and the responses to red and far‐red treatments under controlled environments suggest that phytochrome serves as a sensing mechanism that detects the amount of competition from other plants, and regulates the development of tillers and the partitioning of photosynthate between shoots and roots.
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Claims 7
Claim · model-written summary
Close spacing increased far-red/red light ratio relative to wide spacing.
- Taxon
- wheat
Triticum aestivumt0 - Outcome
- far‐red/red light ratiose0
- Direction
- highere0
- Comparator
- wide‐spaced plantse0
- Setting
- Close‐spacede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Close‐spaced seedlings received higher far‐red/red light ratios than wide‐spaced plants”
t0“wheat”
Claim · model-written summary
Far-red/red ratios were higher in late afternoon than at noon.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- far‐red/red light ratiose0
- Direction
- highere0
- Comparator
- at noone0
- Setting
- late afternoone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The far‐red/red light ratios in all population densities were higher in late afternoon than at noon”
t0“wheat”
Claim · model-written summary
Close spacing produced fewer tillers, less roots and longer leaves than wide spacing.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Close‐spacede0
- Outcome
- fewer tillers, less roots and longer leavese0
- Comparator
- wide‐spaced seedlingse0
- Setting
- field conditionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Close‐spaced plants developed fewer tillers, less roots and longer leaves than wide‐spaced seedlings under field conditions”
t0“wheat”
Claim · model-written summary
Higher far-red/red ratio yielded fewer tillers and longer leaves.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- higher far‐red/red ratioe0
- Outcome
- fewer tillers and longer leavese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a higher far‐red/red ratio during photosynthetic periods resulted in fewer tillers and longer leaves”
t0“wheat”
Claim · model-written summary
End-of-day far-red exposure yielded fewer tillers, longer leaves, less roots and higher shoot/root ratio.
- Taxon
- WheatTriticum aestivume0
- Treatment
- 5‐min exposures to far‐red lighte0
- Outcome
- fewer tillers, longer leaves, less roots, and a higher shoot/root biomass ratioe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat seedlings that received 5‐min exposures to far‐red light at the end of the photosynthetic period each day for 20 consecutive days developed fewer tillers, longer leaves, less roots, and a higher shoot/root biomass ratio”
Claim · model-written summary
Red light reversed far-red effects.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- red lighte0
- Outcome
- effects of far‐red lighte0
- Direction
- reversede0
- Comparator
- far‐red lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of far‐red light were reversed by red light”
t0“wheat”
Claim · model-written summary
Phytochrome may sense competition and regulate tillering and partitioning.
- Taxon
- wheatTriticum aestivumt0
- Gene
- phytochromee0
- Outcome
- development of tillers and the partitioning of photosynthate between shoots and rootse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phytochrome serves as a sensing mechanism that detects the amount of competition from other plants, and regulates the development of tillers and the partitioning of photosynthate between shoots and roots”
t0“wheat”
The same questions in other papers
light · yield · Triticum aestivum (wheat)Positive and negative results
34 papers in the same direction as this paper · 33 in the opposite direction
- positive
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See all 68 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.