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STUDIES ON HOOK‐OPENING IN PHASEOLUS VULGARIS L. BY SELECTIVE R/FR PRETREATMENTS OF EMBRYONIC AXIS and PRIMARY LEAVES *
Author(s) -
Caubergs R.,
Greet J. A. De
Publication year - 1975
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.1751-1097.1975.tb08826.x
Subject(s) - phaseolus , etiolation , hook , botany , phytochrome , biology , biophysics , chemistry , red light , biochemistry , structural engineering , engineering , enzyme
— Hook‐opening of etiolated bean seedlings was studied by inductive light pretreatments, selectively applied to the embryonic axis and to the primary leaves. Statistical analysis of the experimental results substantiated that hook unbending in intact plants is mutually influenced by both organs. When the leaves were excised immediately after their selective preirradiation, hook opening was the same as in the intact control series. Far red light could only fully reverse a red inductive effect when both light qualities were administered to the intact plant. When the cotyledons were removed prior to the light treatments the results did not change qualitatively. Our data indicate that a very precise, highly ordered biophysical recognition system of light signals exists in plants. The transmission of these signals between different organs is very rapid and phytochrome‐mediated.