Phytochrome A null mutants of Arabidopsis display a wild-type phenotype in white light.

@article{Whitelam1993PhytochromeAN,
  title={Phytochrome A null mutants of Arabidopsis display a wild-type phenotype in white light.},
  author={Garry C. Whitelam and E. Johnson and Jinrong Peng and Pierre Carol and Margaret Anderson and J S Cowl and Nicholas P Harberd},
  journal={The Plant cell},
  year={1993},
  volume={5 7},
  pages={757-68}
}
Phytochrome is a family of photoreceptors that regulates plant photomorphogenesis; the best-characterized member of this family is phytochrome A. Here, we report the identification of novel mutations at three Arabidopsis loci (fhy1, fhy2, and fhy3) that confer an elongated hypocotyl in far-red but not in white light. fhy2 mutants are phytochrome A deficient, have reduced or undetectable levels of PHYA transcripts, and contain structural alterations within the PHYA gene. When grown in white… CONTINUE READING
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