How plants read daylight length to decide when to flower
Plant Signaling
The zucchini that suddenly blooms in June or the mums that only flower as days shorten in fall are both following this same internal daylight clock, so knowing how it works helps explain timing quirks in your own garden.
Plants track how long the daylight lasts each day and use that information to decide exactly when to bloom. A protein called CONSTANS builds up during long summer days and, once it reaches a threshold, switches on a signal that travels through the plant telling it 'time to flower.' Scientists are studying this system in a lab plant called Arabidopsis so they can eventually help farmers adapt crops to new climates and locations.
Key Findings
CONSTANS (CO) protein accumulates during long-day light periods and activates FLOWERING LOCUS T (FT), a mobile 'florigen' signal that triggers flowering
CO protein stability is controlled by a network of regulators including GIGANTEA (GI), FKF1, and E3 ubiquitin ligases
The photoperiod pathway combines light-sensing photoreceptors with the plant's internal circadian clock to time flowering precisely
chevron_right Technical Summary
Plants use a genetic switch called CONSTANS to detect day length and time their flowering, and understanding this switch could help scientists breed crops that adapt to shifting climates and new growing regions.
Abstract Preview
Original paper
Genetic Regulation of Photoperiod Sensitivity in Flowering Plants
Photoperiodism represents a critical adaptive mechanism enabling plants to synchronize flowering with optimal environmental conditions. This review examines the molecular and genetic foundations un...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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