florigen

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flor·i·gen

 (flôr′ə-jən)
n.
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.

florigen

(ˈflɒrɪdʒən)
n
(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

flo•ri•gen

(ˈflɔr ɪ dʒən, -ˌdʒɛn, ˈfloʊr-)
n.
a hormone produced by leaves that stimulates flowering in plants.
[1935–40]
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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As boron plays an important role in improving calcium mobility, sugar transport and flowering hormone regulation, boron foliar application is needed to enhance olive flowering[9].
This exciting news led to the incorrect conclusion that gibberellin was unequivocally identified as the flowering hormone. It does cause flowering in some species, but not in others.
Since this pioneering work, there has been a considerable amount of research conducted to identify this signal, which has been called Florigen (flowering hormone); however, there has been little success.