Light-induced growth promotion by SPA1 counteracts phytochrome-mediated growth inhibition during de-etiolation.

@article{Parks2001LightinducedGP,
  title={Light-induced growth promotion by SPA1 counteracts phytochrome-mediated growth inhibition during de-etiolation.},
  author={Brian M. Parks and Ute Hoecker and Edgar P. Spalding},
  journal={Plant physiology},
  year={2001},
  volume={126 3},
  pages={1291-8}
}
Previous evidence has suggested that SPA1 is a signal transduction component that appears to require phytochrome A for function in seedling photomorphogenesis. Using digital image analysis, we examined the time course of growth inhibition induced by red light in spa1 mutants to test the interpretation that SPA1 functions early in a phyA-specific signaling pathway. By comparing wild-type and mutant responses, we found that SPA1 caused an increase in hypocotyl growth rate after approximately 2 h… CONTINUE READING