Negative phototropic response of rhizoid cells in the fern Adiantum capillus-veneris |
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Authors: | Hidenori Tsuboi Noriyuki Suetsugu Masamitsu Wada |
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Institution: | (1) Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minamioosawa, Hachioji, Tokyo 192-0397, Japan;(2) Division of Photobiology, National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki Aichi, 444-8585, Japan;(3) Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba Ibaraki, 305-8572, Japan |
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Abstract: | In general, phototropic responses in land plants are induced by blue light and mediated by blue light receptor phototropins. In many cryptogam plants including the fern Adiantum capillus-veneris, however, red as well as blue light effectively induces a positive phototropic response in protonemal cells. In A. capillus-veneris, the red light effect on the tropistic response is mediated by phytochrome 3 (phy3), a chimeric photoreceptor of phytochrome and full-length phototropin. Here, we report red and blue light-induced negative phototropism in A. capillus-veneris rhizoid cells. Mutants deficient for phy3 lacked red light-induced negative phototropism, indicating that under red light, phy3 mediates negative phototropism in rhizoid cells, contrasting with its role in regulating positive phototropism in protonemal cells. Mutants for phy3 were also partially deficient in rhizoid blue light-induced negative phototropism, suggesting that phy3, in conjunction with phototropins, redundantly mediates the blue light response. |
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Keywords: | Adiantum capillus-veneris Fern Phototropin Phototropism Phytochrome Rhizoid |
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