The molecular mechanism of light signal transduction in plants mediated by the photosensor phytochrome is not well understood. The possibility that phytochrome initiates the signal transduction chain by modulating a G-protein-like receptor is examined in the present work. Etiolated Avena seedlings contain G-proteins as examined in terms of the binding of GTP as well as by cross-reaction with mammalian G-protein antibodies. The binding of GTP was regulated in vivo by red/far-red light. The possible involvement of G-proteins in the phytochrome-mediated signal transduction in etiolated Avena seedlings has been implicated from the study of the light regulated expression of the Cab and phy genes. © 1991.
Romero, L. C., Sommer, D., Gotor, C., & Song, P. S. (1991). G-proteins in etiolated Avena seedlings Possible phytochrome regulation. FEBS Letters, 282(2), 341–346. https://doi.org/10.1016/0014-5793(91)80509-2