ETIOPLAST PHYTOCHROME AND ITS IN VITRO CONTROL OF GIBBERELLIN EFFLUX

摘要: Phytochrome can be detected in preparations of isolated etioplasts by dual-wavelength difference spectrophotometry and plays a distinct physiological role the regulation endogenous gibberellin levels. This chapter discusses studies that support hypothesis phytochrome is located association with certain critical membranes cell over which it exerts regulatory function. The question as to whether regulates passage specific manner involving “transport factors” or nonspecific manner, such ATP levels, open speculation. While first alternative represents mechanism control, second more generally applicable phenomena. Investigations membrane-bound indicate Pfr bind membrane sites are not available Pr. Therefore, may act ligand, allosterically interacts membrane-binding sites. Etioplast envisaged existing free soluble form stroma, upon photoconversion migrates membrane, where could specifically interact transport proteins permeases.