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Diameter and amount of β-carotene determine the maximal phototropic bending angle ofPhycomyces sporangiophores

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Abstract

Wild-type sporangiophores at stage IVb (final developmental stage after sporangium formation) ofPhycomyces show a pronounced positive phototropism to unilateral white light. We found that the maximal bending angle was larger in thin sporangiophores than in thick ones, and larger in the sporangiophores containing a small amount of β-carotene than in those containing a large amount of it. These phenomena probably occur because of the increase in length of intracellular light path or in the intracellular light-attenuation coefficient, as supported theoretically.

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Authors and Affiliations

  1. Institute of Genetic Ecology, Tohoku University, Sendai, Japan

    Tamotsu Ootaki

  2. Faculty of Education, Yamagata University, Yamagata, Japan

    Kaori Koga, Hiroyuki Ito & Toshisuke Tsuru

Authors
  1. Tamotsu Ootaki
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  2. Kaori Koga
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  3. Hiroyuki Ito
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  4. Toshisuke Tsuru
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Ootaki, T., Koga, K., Ito, H. et al. Diameter and amount of β-carotene determine the maximal phototropic bending angle ofPhycomyces sporangiophores. Bot. Mag. Tokyo 104, 323–340 (1991). https://doi.org/10.1007/BF02488385

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  • DOI: https://doi.org/10.1007/BF02488385

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