Evidence against involvement of circadian floral rhythm in the critical daylength measurement in Lemna gibba G3
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概要
- 論文の詳細を見る
Using the min-LD method, light requirements of the L1- and L2-phases of L. gibba G3 were found to be satisfied by only 5 min illumination given respectively from CT 0:00 to 0:05 and from CT 11:55 to 12:00. This rigorous time sense was displayed without any alteration even in the presence of iron reagents, e.g., 10^<-5> _M o-phenanthroline, 10^<-5> _M α,α'-dipyridyl and 10^<-6> _M kinetin, which completely eliminated circadian rhythmicity in reproductive (flower production) as well as vegetative (frond production) response to a light pulse scanning a continuous dark period. Circadian rhythms of metabolic activities, e.g., active K^+ ion uptake and respiratory CO_2 output, were not changed at all by the iron reagents. These and relevant results suggested that in this long-day duckweed, the circadian oscillator, probably located in the meristem and sensitive to iron deficiency, only modulates the frond and flower production in the meristem and is not related to the critical daylength measurement.
- 日本植物生理学会の論文
著者
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Oota Yukito
Biological Institute Faculty Of Science Nagoya University
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Tsudzuki Takahiko
Biological Institute, Faculty of Science, Nagoya University
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Tsudzuki Takahiko
Biological Institute Faculty Of Science Nagoya University
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