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Control of ion absorption by phytochrome

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Summary

Phosphate absorption by segments excised from hypocotyls of Phaseolus aureus Roxb. was inhibited by either continuous or short-term illumination with red light. Maximal inhibition was observed at pH 6.5. Illumination with 800 erg cm-2 s-1 of red light for 5 min was sufficient to obtain maximal inhibition. The effect of red light was completely counteracted by illumination.with 4500 erg cm-2 s-1 of far red light for 3 min, indicating that the effect was mediatedy by phytochrome. The efflux of phosphate from the segments was not altered by illumination. Similar effects of red and far-red light on potassium influx and efflux were also found.

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Abbreviations

R:

red light

FR:

far red light

Pfr :

far red-absorbing form of phytochrome

Pi :

H2PO4 -+HPO4 2-

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Authors and Affiliations

  1. Faculty of Science, Biological Institute, 464, Nagoya, Japan

    Takafumi Tezuka

  2. Department of Agricultural Chemistry, Faculty of Agriculture, Nagoya University, 464, Nagoya, Japan

    Yukio Yamamoto

Authors
  1. Takafumi Tezuka
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  2. Yukio Yamamoto
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Tezuka, T., Yamamoto, Y. Control of ion absorption by phytochrome. Planta 122, 239–244 (1975). https://doi.org/10.1007/BF00385271

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  • DOI: https://doi.org/10.1007/BF00385271

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