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ESR STUDY OF A NEW LIGHT‐SENSITIVE FREE RADICAL IN THE COATS OF WHEAT AND OTHER SEEDS
Author(s) -
WINDLE J. J.
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.tb06246.x
Subject(s) - radical , chemistry , signal (programming language) , endogeny , saturation (graph theory) , photochemistry , botany , biophysics , biology , biochemistry , mathematics , combinatorics , computer science , programming language
— The endogenous free radical signal in the coat of wheat and other seeds is found to increase rapidly upon exposure to light from a high pressure mercury lamp reaching a saturation value in about one hour. Upon dark storage the signal slowly decays to approximately its initial value after a number of days. Re‐exposure to the light causes the signal to again increase. The signal also depends inversely and reversibly upon moisture content. The dynamic behavior of the signal indicates that the radicals are produced from a limited number of centers in the seed coat. The identity of these centers is still unknown, but our results rule out such possibilities as chlorophyll, melanin and phenolic compounds and suggest that a new light‐sensitive component is present in the outer coating of seeds.