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Re: Initiation of Flowering in Amorphophallus

  • Subject: Re: Initiation of Flowering in Amorphophallus
  • From: "Tom Croat" <Thomas.Croat@mobot.org>
  • Date: Wed, 26 Mar 2008 12:07:27 -0500

Title: RE: [Aroid-l] Initiation of Flowering in Amorphophallus

Dear Derek:

        Thank you for your suggestions.  Peter has been talking!  He personally contacted a number of people and he really gets results!  Several people who are very familiar with how to get this done have written long detailed procedures so we are going to try these things.  If these actually work I will write up the entire process and publish it because it would be generally good for everyone.  Wilberts suggestions were the longest but the Director of the Berkeley Botanical Garden swore by his methods too, saying that they had tried everything before his method worked. 

        I too am reluctant to use gibberellic acid on anything with such a large inflorescence.


From: aroid-l-bounces@gizmoworks.com [mailto:aroid-l-bounces@gizmoworks.com] On Behalf Of derek burch
Sent: Wednesday, March 26, 2008 9:29 AM
To: 'Discussion of aroids'
Subject: Re: [Aroid-l] Initiation of Flowering in Amorphophallus


I think that you have been getting exactly the right suggestions that concern more-than-ample root run, and plenty of good nutrition and water, coupled with the really basic need for strong light for the foliage (remember, fertilizer can't build the basic sugars: there is no substitute for light in doing that).

I would steer very clear of experimenting with gibberellic acid. I know that there have been successes with some groups, and I have never tried with amorphs, but I got some very, very weird inflorescences on Epipremnum some years ago when I was still curious about things like that.

Perhaps Peter could come down to the greenhouse and speak strongly to the tubers ...


-----Original Message-----
From: aroid-l-bounces@gizmoworks.com [mailto:aroid-l-bounces@gizmoworks.com] On Behalf Of StroWi@t-online.de
Sent: Tuesday, March 25, 2008 5:20 AM
To: Discussion of aroids
Subject: Re: [Aroid-l] Initiation of Flowering in Amorphophallus


a quick search with google scholar gave some hints that gibberellic acid

can trigger flower induction in araceae.

The problem in your case will be that it is uncertain when the

application should be done (foliage/tuber), if it should be repeated and

which concentration should be used.

I did not do any further reading, but might find some time later.

This only as a quick response.

Happy growing/flowering,


Hormonal control of inflorescence development in plantlets of calla lily

(Zantedeschia spp.) grown in vitro ZeitschriftPlant Growth

RegulationVerlagSpringer NetherlandsISSN0167-6903 (Print) 1573-5087

(Online)HeftVolume 42, Number 1 / Januar


Vered Naor1, Jaime Kigel1 and Meira Ziv1

(1) The Robert Smith Institute for Plant Sciences and Genetics in

Agriculture, Faculty of Agricultural, Food and Environmental Quality

Sciences, The Hebrew University of Jerusalem, Rehovot, P.O. Box 12,

Jerusalem, 76100, Israel

Abstract  Hormonal control of flower induction and inflorescence

development in vitro was investigated in photoperiodically day-neutral

calla lily (Zantedeschia spp., colored cultivars). The effects of

gibberellins (GAs, 5.8–2900 M) and the cytokinin benzyl adenine (BA,

0.4–13.3 M) on inflorescence development were studied in plantlets

regenerated in tissue culture. Plantlets were dipped in GA and BA

solutions prior to replanting in new media. GA was mandatory for the

shift from the vegetative to the reproductive stage. GA3, GA1 and GA4

had the same florigenic effect. Inflorescence development in the apical

bud was observed after 30–50 days in GA-treated plantlets grown in vitro

and resembled the pattern occurring under natural conditions. The

transition from the vegetative to the reproductive phase was

characterized by a swollen, dome-shaped apex that transformed into a

smooth elongated apex surrounded by the spathe primordium, at the tip of

the elongating peduncle primordium. Floret primordia developed in

inflorescences at a more advanced stage. The female florets located at

the base of the primordial spadix, could be clearly distinguished from

male florets located above them. BA did not have an effect on flower

induction but, in the presence of GA, BA at concentrations up to 4.4 M

enhanced inflorescence differentiation. The results indicate that

inflorescence development in Zantedeschia plantlets in tissue culture

can serve as a potential model to study the role of GAs and other

factors in the flowering process of day-neutral plants that do not

require external signals for flower induction.Benzyladenine -

Day-neutral plant - Flowering - Geophytes - Gibberellins - Shoot apex -

Tissue culture

Titre du document / Document title

Gibberellic acid-induced flowering of Syngonium podophyllum schott

'White butterfly'

Auteur(s) / Author(s)

HENNY R. J. (1) ; NORMAN D. J. (1) ; KANE M. E. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) University of Florida, Institute of Food and Agricultural Science,

Central Florida Research and Education Center, 2807 Bin ion Road,

Apopka, FL 32703, ETATS-UNIS

(2) Department of Environmental Horticulture, P.O. Box 110670,

University of Florida, Gainesville, FL 32611, ETATS-UNIS

Résumé / Abstract

Syngonium 'White Butterfly', growing in 1.6-L pots and treated in August

with a single GA[3] spray at 250 to 2000 mg.L[-1], flowered within 86

days. Mean flower number increased with GA[3] concentration. Flowers

were normal in appearance and were fertile. Chemical name used:

gibberellic acid (GA[3]).

Revue / Journal Title

HortScience  (HortScience)  ISSN 0018-5345   CODEN HJHSAR  

Source / Source

1999, vol. 34, no4, pp. 676-677 (7 ref.)

Langue / Language


-----Original Message-----

Date: Mon, 24 Mar 2008 18:04:57 +0100

Subject: [Aroid-l] Initiation of Flowering in Amorphophallus

From: "Tom Croat"


Fellow Aroiders:

          My Director is anxious that we flower Amorphophallus titanum

which we have had here for many years.  It has always been an

embarrassment that we, among all the institutions in the world

practically, have not flowered this species even though we have had the

species from the earliest days.  Anyway, I am now asking for advice from

those of you who have flowered this species if you know of any way it

can be induced to flower. I know that many of you do not actually want

your plants of Amorphophallus to flower but if you have any ideas about

what would induce these “lazy” plants of mine to flower (short of

killing it) please let me know.

Tom Croat


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