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DOSE RESPONSE BEHAVIOUR FOR POLAROTROPISM OF THE CHLORONEMA OF THE FERN DRYOPTERIS FILIX‐MAS (L .) SCHOTT
Author(s) -
STEINER A. M.
Publication year - 1969
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.1751-1097.1969.tb07318.x
Subject(s) - fern , dryopteris , maxima , botany , maxima and minima , biology , mathematics , art , mathematical analysis , performance art , art history
— The dose response behaviour for polarotropism of the chloronema of the fern Dryopteris filix‐mas was studied in detail. By varying the two factors, time and intensity, dose response curves were obtained, which consisted of as many as two maxima and minima or no maxima and minima at all. Furthermore, the effects of red light and dark, given before polarotropic induction, were compared, and the influence of temperature on the dose response behaviour was examined. There are two main results: (1) Under all conditions tested, the dose response behaviour in far‐red, red, blue, and near U.V. apparently is the same. (2) In this one system, the chloronema of Dryopteris , all types of dose response curves, which have been described previously for tropic responses mediated by light, could be obtained simply by varying the conditions. The variable and complex dose response behaviour is discussed in connection with other photoresponses in lower and higher plants.