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Different forms of phototropic response induced by microbeam irradiation of discrete regions of an organ
Author(s) -
TAYLOR A.,
HART J. W.,
BERG A. R.
Publication year - 1988
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1988.tb01807.x
Subject(s) - phototropism , microbeam , irradiation , coleoptile , apex (geometry) , curvature , biophysics , chemistry , anatomy , biology , optics , physics , blue light , botany , mathematics , geometry , nuclear physics
Continuous unilateral microbeam (1 mm) irradiation of coleoptiles of Avena saliva L. produces growth responses in non‐irradiated regions of the organ. Irradiation of the apex is followed by differential growth which commences in the apical zone, but then moves in a basipetal direction and results in positive curvature. Irradiation of the base also results in differential growth which commences at the apex and moves basipetally. However, the growth differential in this case results in negative curvature. The results of basal irradiation suggest the likely occurrence of acropetal transmission of the phototropic signal. The rate of movement of this signal is faster than the documented rate of auxin transport.