Premium
IN VIVO MEASUREMENTS OF THE PHYTOCHROME PHOTOSTATIONARY STATE IN FAR RED LIGHT
Author(s) -
SCHÄFER E.,
MARCHAL B.,
MARMÉ D.
Publication year - 1972
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1972.tb06257.x
Subject(s) - phytochrome , photostationary state , etiolation , far red , red light , seedling , in vivo , botany , biology , chemistry , biochemistry , genetics , enzyme , photoisomerization , isomerization , catalysis
— The in vivo photostationary state, ϕ fr = ([ P fr ] fr /[ P ]), of phytochrome in far red light has been determined in mustard seedling cotyledons by three different methods. The ϕ fr is a function of the length of time of etiolation ( t = 36 hr, ϕ fr = 0·14; t = 72 – 120 hr, ϕ fr = 0·075). The calculated ϕ r = 0·8. The amount of P tot is strongly dependent on the time of onset of far red light. These data imply that it would be almost impossible to maintain a constant level of P fr in mustard cotyledons over a considerable period of time.