Coupling of phytochrome B to the control of hypocotyl growth in Arabidopsis

  title={Coupling of phytochrome B to the control of hypocotyl growth in Arabidopsis},
  author={Jorge Jos{\'e} Casal},
Etiolated seedlings of the wild-type (WT) and of the phyB-1 mutant of Arabidopsis thaliana (L.) Heynh. were exposed to red-light (R) and far-red light (FR) treatments to characterize the action of phytochrome B on hypocotyl extension growth. A single R or FR pulse had no detectable effects on hypocotyl growth. After 24-h pre-treatment with continuous FR (FRc) a single R, compared to FR pulse inhibited (more than 70%) subsequent hypocotyl growth in the WT but not in the phyB-1 mutant. This… CONTINUE READING


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