[Aroid-l]

From: StroWi at t-online.de (StroWi at t-online.de) on 2008.03.25 at 09:20:03(17213) Tom, 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, Bernhard. +More 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 2004DOI10.1023/B:GROW.0000014889.16196.f7Seiten7-14 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 R?sum? / 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 Anglais -----Original Message----- Date: Mon, 24 Mar 2008 18:04:57 +0100 Subject: [Aroid-l] Initiation of Flowering in Amorphophallus From: "Tom Croat" To: 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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