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Quantitative manipulation of the photoperiodic flowering by a small-molecule clock modulator

Maeda, A. E.; Ito, S.; Oyama, T.; Sato, A.; Nakamichi, N.; Muranaka, T.

2025-11-07 plant biology
10.1101/2025.11.06.686944 bioRxiv
Show abstract

Photoperiodism, a seasonal response mechanism that relies on day-length measurement by the circadian clock, is a major regulator of flowering time 1. The external coincidence model proposes that the alignment between the internal circadian phase and external light signals triggers photoperiodic responses 2. It has been challenging to establish robust models for the quantitative relationship between clock and flowering time, due to a lack of tools to modulate clock quantitatively. Here, using a circadian period-lengthening small molecule, we demonstrated the quantitative modulation of the critical day length for flowering in monocots.

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