The Arabidopsis repressor of light signaling SPA1 acts in the phloem to regulate seedling de-etiolation, leaf expansion and flowering time.

@article{Ranjan2011TheAR,
  title={The Arabidopsis repressor of light signaling SPA1 acts in the phloem to regulate seedling de-etiolation, leaf expansion and flowering time.},
  author={Aashish Ranjan and Gabriele Fiene and Petra Fackendahl and Ute Hoecker},
  journal={Development},
  year={2011},
  volume={138 9},
  pages={1851-62}
}
Plants adjust their growth and development in response to the ambient light environment. These light responses involve systemic signals that coordinate differentiation of different tissues and organs. Here, we have investigated the function of the key repressor of photomorphogenesis SPA1 in different tissues of the plant by expressing GUS-SPA1 under the control of tissue-specific promoters in a spa mutant background. We show that SPA1 expression in the phloem vasculature is sufficient to rescue… CONTINUE READING

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