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CHARACTERIZATION OF THE FAST LIGHT‐EVOKED ELECTRICAL RESPONSES FROM LEAVES
Author(s) -
EBREY THOMAS G.
Publication year - 1968
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.1751-1097.1968.tb08017.x
Subject(s) - polarity (international relations) , materials science , electrode , photoconductivity , millisecond , optoelectronics , optics , response time , chemistry , physics , computer science , biochemistry , astronomy , cell , computer graphics (images)
— A fast electrical response with a millisecond time course and no detectable latency has been recorded from the front surface of a bean leaf uniformly illuminated by an intense flash. The response is biphasic with the tip of the leaf always going negative with respect to the base of the leaf during the first msec regardless of the electrode positions and direction of light. Careful checks were made to eliminate the possibility that the response is due to some type of electrode artifact or to a photovoltaic, photogalvanic or photoconductive process in the leaf. Several properties of this response, including temperature dependence, flash energy dependence, polarity of the response with respect to leaf orientation and the effect of external polarizing voltages were investigated in order to compare it with fast photoresponses recently detected from other biological materials such as the vertebrate eye, pigment epithelium, and skin.