Phytochrome-mediated phototropism inAdiantum cuneatum young leaves |
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Authors: | Masamitsu Wada Hiroko Sei |
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Institution: | (1) Biology Department, Tokyo Metropolitan University, Minami-Osawa 1-1, 192-03 Hachioji-shi, Tokyo, Japan |
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Abstract: | Phototropism of youngAdiantum fern leaves is induced by red light as well as blue light. The red light response is mediated by phytochrome. This is the
first evidence of phytochrome action in diploid fern tissue. The blue light response is mainly mediated not by phytochrome,
but probably by a blue light-absorbing pigment as in the case of almost all plants and fungi. The red light-induced phototropism
becomes detectable within 2 hr after the onset of unilateral light. The highest bending rate is about 10 degrees/hr, which
occurs between 3–5 hr after the induction of the tropic response. The bending region is about 6–8 mm from the highest point
of the coiled crozier where the growth rate becomes slow. |
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Keywords: | Adiantum Blue-light-absorbing pigment Fern Leaf Phototropism Phytochrome |
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