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- Title
Blue light-regulation of cell division in <em>Adiantum</em> protonemata: an approach with pulse stimulation.
- Authors
Iino, M.; Nakagawa, Y.; Wada, M.
- Abstract
Cell division of the single-celled Adiantum protonemata produced by red-light (RL) incubation of germinated spores is induced by transfer to darkness and is stimulated by blue light (BL). It is known that the cellular process leading to this cell division includes one cell cycle and the BL response results from shortening of the G1 phase. The authors studied this BL regulation of cell cycle by giving a pulse of BL after RL termination and measuring changes in the proportion of divided cells. To minimize phytochrome responses arising from BL irradiation, the plants were kept in continuous farred light instead of total darkness after the RL incubation. The response to a pulse (10-100 s) approached saturation with increasing fluences in a manner that reciprocity is valid. The sensitivity to BL, investigated by measuring the response to a saturating pulse, showed an increase in the first several hours after RL termination, followed by a sustained sensitivity for 20 h. Time courses of the pulse-induced responses showed a lag of about 12 h. which was considerably shorter than in the nonstimulated control, the lag was approximately independent of the strength of BL stimulation or the timing of BL application after RL termination, and the major difference occurred in the slope. It is concluded that the sensitivity to BL is retained during the time span in which the dark-dependent G1 phase progresses, and that the BL response is initiated independently of the reactions involved in the dark-dependent G1 phase. A minimal reaction model of G1 phase is suggested to unify the results.
- Subjects
MAIDENHAIR ferns; PROTONEMATA; BLUE light; CELL division
- Publication
Plant, Cell & Environment, 1988, Vol 11, Issue 6, p547
- ISSN
0140-7791
- Publication type
Article
- DOI
10.1111/j.1365-3040.1988.tb01793.x