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A plant hormone that promotes flowering.

[Latin flōs, flōr-, flower; see bhel- in Indo-European roots + -gen.]

flor′i·gen′ic (-jĕn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Botany) the hypothetical plant hormone that induces flowering, thought to be synthesized in the leaves as a photoperiodic response and transmitted to the flower buds
[C20: from Latin flōr-, flōs flower + -gen]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈflɔr ɪ dʒən, -ˌdʒɛn, ˈfloʊr-)
a hormone produced by leaves that stimulates flowering in plants.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
(1983) on Pharbitis nil, could indicate that PGs are the hypothetical flowering hormone (florigen).
This hybrid, the team found, produced greater yields because there was one normal copy and one mutated copy of a single gene that produces a protein called florigen.
florigen: Flowering hormone are the terms used for the hypothesized hormone-like molecules that control and/or trigger flowering in plants.
Based on our field observation, flowering time of scion cultivars can be advanced by grafting onto an early cultivar, which has less chilling requirement for flowering induction and thus earlier production of florigen that triggers flower differentiation.
OsBBX14 delays heading date by repressing florigen gene expression under long and short-day conditions in rice.