Far-Red Radiation Reflected from Adjacent Leaves: An Early Signal of Competition in Plant Canopies

@article{Ballar1990FarRedRR,
  title={Far-Red Radiation Reflected from Adjacent Leaves: An Early Signal of Competition in Plant Canopies},
  author={Carlos L. Ballar� and Ana Leonor Scopel and Rodolfo A. S�nchez},
  journal={Science},
  year={1990},
  volume={247},
  pages={329 - 332}
}
When individual seedlings of Datura ferox and Sinapis alba were transferred to populations formed by plants of similar stature, they responded with an increase in the rate of stem elongation. The reaction was detected within 3 days after transplanting and occurred well before shading among neighbors became important. This rapid response, which may be crucial for success in the competition for light, was reduced or abolished when individual internodes were "blinded" to the far-red radiation… Expand
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It is suggested that the change in the R: FR ratio within seedling canopies serves as an early warning signal of oncoming competition. Expand
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DEVELOPMENT in higher plants is highly responsive to environmental factors, the most important, in natural conditions, being light. Perception of light quality involves at least two photo-receptors,Expand
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The evidence supports the hypothesis that, in stands formed by plants of similar size, the red:far-red ratio of the light that impinges laterally on the stems is among the earliest environmental cues that allow plants to detect local canopy density and adjust axis extension accordingly. Expand
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Histological studies on the pith showed that the longer internodes of the treated plants were composed of longer cells and of a larger number of cells than those of the control plants, which demonstrated that the increase in growth of theinternode was the result of far-red light acting on both the internode and on other parts of the shoot system. Expand
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Abstract— Qualitative changes in the spectral energy distribution (SED) of natural daylight within the 400–800 nm wavelength band have been followed within a wheat canopy. Selective attenuation ofExpand
FLUENCE RATE COMPENSATION OF THE PERCEPTION OF RED: FAR‐RED RATIO BY PHYTOCHROME IN LIGHT‐GROWN SEEDLINGS *
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The lower limit of fluence‐rate compensation is established to assess whether or not compensation is effective at the total fluence rates typical of herbaceous canopies and to discuss the photosynthetic competence of the seedlings grown under these conditions. Expand
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The spectral composition of near ultraviolet and visible radiation in the open and in pure stands of Pinus resinosa Ait. and Acer saccharum Marsh was determined for cloudless, hazy, and overcastExpand
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