Blue-light-induced shift of the phototropic fluence-response curve in Pilobolus sporangiophores |
| |
Authors: | Hiroyoshi Kubo Hitoshi Mihara |
| |
Institution: | (1) Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University, 606 Kyoto, Japan;(2) Present address: Department of Biology, Faculty of Science, Shinshu University, 390 Matsumoto, Japan |
| |
Abstract: | The effects of preirradiation with blue light on the shift of the fluence-response curve for the first and the second positive curvatures were examined in Pilobolus crystallinus (Wiggers) Tode sporangiophores. A 1-min preirradiation with blue light at 47 or 960 nmol·m-2 lowered the fluence-response curve for the first positive curvature and shifted the peak to a higher fluence. The fluence-response curve was shifted back to a lower fluence when a dark period was inserted between the preirradiation and the curvature-inducing light. This shift back to lower fluence was biphasic when the fluence was high (960 nmol · m-2), indicating the participation of two components in the phototropic reaction for the first positive curvature.The fluence-response curve for the second positive curvature did not seem to be shifted to a higher fluence region when fluence was varied by varying exposure time. However, the fluence-response curve obtained by varying the fluence rate of a 20-min irradiation period indicated that the second positive curvature was also shifted to a higher-fluence region by preirradiation with blue light. A small shoulder appeared on the fluence-response curve when preirradiation at a high fluence rate was given.Abbreviations BL
blue light
- CIL
curvature-inducing light |
| |
Keywords: | Blue light (phototropism) Phototropism Phycomycetes Pilobolus Sporangiophore |
本文献已被 SpringerLink 等数据库收录! |
|