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SIMILARITY IN DOSE RESPONSES, ACTION SPECTRA AND RED LIGHT RESPONSES BETWEEN PHOTOTROPISM AND PHOTOINHIBITION OF GROWTH *
Author(s) -
Elliott W. M.,
ShenMiller J.
Publication year - 1976
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.1751-1097.1976.tb07241.x
Subject(s) - phototropism , photoinhibition , blue light , spectral line , action spectrum , biophysics , chemistry , botany , biology , optics , physics , photosynthesis , photosystem ii , astronomy
— First positive phototropism and photoinhibition of growth of oat colcoptiles share similar dose response curves and action spectra. Both responses increase with increasing dosage of blue light (440 nm) up to 10 13 photons cm ‐2 , then both decrease with increasing dosage. Action spectra for both responses have peaks at 360, 440, and 470 nm. When red light (660 nm) was given beforehand, the sensitivity of each response to blue light was lessened. These data indicate a close correlation between phototropism and photoinhibition of growth. Both phenomena can be explained as a result of photoinhibition of basipetal transport of auxin.