| Автор | Kataoka, Hironao |
| Дата выпуска | 1990 |
| dc.description | As reported in a previous article [Kataoka (1988a) Plant Cell Physiol. 29: 1323], growing apices of the xanthophycean coenocytic alga, Vaucheria terrestris, bends away from a unilateral blue light (BL) source, if they are simultaneously irradiated with strong background BL in a solution containing 1–4 mM Ca<sup>2+</sup>. Since the negative bending is a function of the product of the external Ca<sup>2+</sup> concentration and the fluence rate of background BL, a BL-induced Ca<sup>2+</sup>-influx at the apex was hypothesized to be the cause of the phototropic inversion. The present report provides strong evidence for this hypothesis. Addition of the Ca<sup>2+</sup> channel blockers, La<sup>3+</sup>, verapamil, nifedipine and nitrendipine to media containing 4 mM Ca<sup>2+</sup> completely inhibited the phototropic inversion. By contrast, 1 μM A23187 (plus 4 mM Ca<sup>2+</sup>) not only enhanced the phototropic inversion under background BL, but also mimicked the background BL; i.e. it caused negative bending under safe red light. Inhibition of phototropic inversion by La<sup>3+</sup> is also observed under conditions where the algae are irradiated with unilateral BL for 1 week. A BL-dependent Ca<sup>2+</sup> influx and a consequential elevation of the cytoplasmic Ca<sup>2+</sup>-level in the apical growth region must be involved in the early steps of phototropic response. A BL-controlled opening of L-type Ca<sup>2+</sup> channels is also suggested. |
| Формат | application.pdf |
| Издатель | Oxford University Press |
| Копирайт | © 1990 The Japanese Society of Plant Physiologists (JSPP) |
| Тема | A23187 |
| Тема | Blue light |
| Тема | Calcium |
| Тема | Ca<sup>2+</sup> channel blockers |
| Тема | Phototropism (alga) |
| Тема | Vaucheria |
| Тема | Articles |
| Название | Negative Phototropism of Vaucheria terrestris Regulated by Calcium II. Inhibition by Ca<sup>2+</sup>-Channel Blockers and Mimesis by A23187<sup>1</sup><sup>2</sup> |
| Тип | research-article |
| Electronic ISSN | 1471-9053 |
| Print ISSN | 0032-0781 |
| Журнал | Plant and Cell Physiology |
| Том | 31 |
| Первая страница | 933 |
| Последняя страница | 940 |
| Аффилиация | Institute of Genetic Ecology, Tohoku UniversityAoba-ku, Sendai, 980 Japan |
| Выпуск | 7 |
