Function of Light in the Light-induced Geotropic Response in Zea Roots |
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Authors: | Suzuki T Tanaka M Fujii T |
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Affiliation: | Institute of Biological Sciences, University of Tsukuba, Sakura-mura, Ibaraki 305, Japan. |
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Abstract: | The light doses just above the threshold energy value for inducing the geotropic responsiveness in the roots of Zea mays L., cv. Golden Cross Bantam 70, caused a drastic rise in the NADPH level and a drop in the NADP level in 2-millimeter root tips. Some reducing agents lowered the threshold energy value up to about one-third of the control. From these results, we deduce that light may exert two functions in the geotropic response of Zea primary roots, one being the photochemical transformation of a photoreceptor and the other being the induction of a reduction state in the tissue. |
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