Effect of interruption of the nyctoperiod with an R/FR-mixture of various ratios of red and far-redlight on flowering in Lemna gibba G3
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A brief R pulse inserted in the 15-hr nyctoperiod of the 9L 15D regime almost always promoted flower formation of a long-day duckweed, Lemna gibba G3. This R effect was partially reversed by subsequent FR, which suggests that phytochrome is involved in the floral processes occurring in the nyctoperiod. The null % R value (% of R in the R/FR-mixture that exerts no effect on flowering) was high during the initial 7.5 hr of the nyctoperiod, then rapidly decreased. The starting time of the rapid decrease in the null % R value was hardly affected by a change in temperature in the nyctoperiod. A similarly high initial level of the null % R value followed by a rapid decrease was observed when the nyctoperiod was extended to 39 hr. At hour 15 of the 39-hr nyctoperiod, flower promotion by the R pulse was not reversed by subsequent FR, although the spectral dependence of the light pulse effect did not exclude the possible involvement of phytochrome. At about hour 21 of the 39-hr nyctoperiod, the null % R value began to increase rapidly, and almost reached the initial high level at hour 24 when R-FR reversibility was also restored. These results suggest that the Pfr-level remained high during the initial hours of the nyctoperiod, followed by a rapid decrease irrespective of the temperature of the nyctoperiod. This rapid decrease in the Pfr-level may play a role in the time measurement of the photoperiodic floral induction of L. gibba G3.
- 日本植物生理学会の論文
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関連論文
- Maintenance of high Pfr-level in the dark period in relation to flowering in Lemna gibba G3
- Effect of interruption of the nyctoperiod with an R/FR-mixture of various ratios of red and far-redlight on flowering in Lemna gibba G3