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Regulation of Prenyl Chain Synthesis in Etiolated Hordeum Seedlings by Far‐Red and White Light
Author(s) -
LICHTENTHALER HARTMUT K.
Publication year - 1975
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1975.tb03161.x
Subject(s) - protochlorophyllide , etiolation , prenylation , phytochrome , hordeum vulgare , far red , chlorophyll , darkness , plastid , chemistry , biochemistry , biosynthesis , biology , botany , chloroplast , red light , enzyme , poaceae , gene
The kinetics of prenyl chain formation (C 20 phytyl in chlorophylls, vitamin K I and α‐tocopherol; C 40 carotenoids and C 45 in plastoquinone‐9) in plastids of etiolated Hordeum seedlings was compared in continuous darkness and after far‐red and white light treatments:1 Continuous far‐red (via phytochrome Pfr) enhances the synthesis rate of all prenyl chains, but does practically not change the dark pattern of prenyl chain accumulation. Free C 20 phytyl chains could not be detected by means of thin layer chromatography. 2 White light induces a much stronger enhancement of prenyl chain formation than does far‐red. It also changes the pattern of prenyl chain synthesis by a particularly strong promotion of the synthesis of phytyl chains, which get bound to chlorophyll a . The rate of chlorophyllide formation seems to determine the rate of enhanced phytyl formation. 3 It is assumed that the enzyme, which esterifies chlorophyllide a with the phytyl chain, is formed or activated by far‐red treatment, but only starts working in white light, when the protochlorophyllide holochrome is re‐arranged to the chlorophyllide holochrome.