Reduced phototropism in pks mutants may be due to altered auxin-regulated gene expression or reduced lateral auxin transport.

@article{Kami2014ReducedPI,
  title={Reduced phototropism in pks mutants may be due to altered auxin-regulated gene expression or reduced lateral auxin transport.},
  author={Chitose Kami and Laure Allenbach and Melina Zourelidou and Karin Ljung and Fr{\'e}d{\'e}ric Sch{\"u}tz and Erika Isono and Masaaki K. Watahiki and Kotaro Yamamoto and Claus Schwechheimer and Christian Fankhauser},
  journal={The Plant journal : for cell and molecular biology},
  year={2014},
  volume={77 3},
  pages={393-403}
}
Phototropism allows plants to orient their photosynthetic organs towards the light. In Arabidopsis, phototropins 1 and 2 sense directional blue light such that phot1 triggers phototropism in response to low fluence rates, while both phot1 and phot2 mediate this response under higher light conditions. Phototropism results from asymmetric growth in the hypocotyl elongation zone that depends on an auxin gradient across the embryonic stem. How phototropin activation leads to this growth response is… CONTINUE READING
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