Full TGIF Record # 76805
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Web URL(s):http://www.plantphysiol.org/cgi/content/full/127/2/624
    Last checked: 11/2001
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http://www.plantphysiol.org/cgi/reprint/127/2/624
    Last checked: 06/09/2008
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Publication Type:
i
Refereed
Author(s):King, Rod W.; Moritz, Thomas; Evans, Lloyd T.; Junttila, Olavi; Herlt, Anthony J.
Author Affiliation:King: Commonwealth Scientific and Industrial Research Organization Plant Industry, Canberra, Australia; Moritz: Umea Plant Science Centre, Swedish University of Agricultural Sciences, Umea, Sweden; Evans: Department of Plant Physiology and Microbiology, University of Tromso, Tromso, Norway; Junttila, Herlt: Research School of Chemistry, Australian National University, Canberra, Australian Capitol Territory
Title:Long-day induction of flowering in Lolium temulentum involves sequential increases in specific gibberellins at the shoot apex
Source:Plant Physiology. Vol. 127, No. 2, October 2001, p. 624-632.
Publishing Information:Rockville, MD: American Society of Plant Physiologists
# of Pages:9
Keywords:TIC Keywords: Time-of-day; Flowering; Lolium temulentum; Gibberellins; Shoot apex; Growth; Flowers; Gas chromatography; Flower induction; Inflorescences
Abstract/Contents:"One challenge for plant biology has been to identify floral stimuli at the shoot apex. Using sensitive and specific gas chromatography-mass spectometry techniques, we have followed changes in gibberellins (GAs) at the shoot apex during long day (LD)-regulated induction of flowering in the grass Lolium temulentum. Two seperate roles of GAs in flowering are indicated. First, within 8 h of an inductive LD, i.e. at the time of floral evocation, the GA5 content of the shoot apex doubled to about 120 ng g -1 dry weight. The concentration of applied GA5 required for floral induction of excised apices (R.W. King, C. Blundell, L.T. Evans [1993] Aust J Plant Physiol 20: 337-348) was similiar to that in the shoot apex. Leaf-applied [H4] GA5 was transported intact from the leaf to the shoot apex, flowering being proportional to the amount of GA5 imported. Thus, GA5 could be part of the LD stimulus for floral evocation of L. temulentum or, alternatively, its increase at the shoot apex could follow import of a primary floral stimulus. Later, during interflorescence differentiation and especially after exposure to additional LD, a second GA action was apparent. The content of GA1 and GA4 in the apex increased greatly, whereas GA5 decreased by up to 75%. GA4, applied during inflorescence differentiation strongly promoted flowering and stem elongation, whereas it was ineffective for earlier floral evocation although it caused stem growth at all times of application. Thus, we conclude that GA1 and GA4 are secondary, late-acting stimuli for inflorescence differentiation in L. temulentum.
Language:English
References:29
Note:Graphs
Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
King, R. W., T. Moritz, L. T. Evans, O. Junttila, and A. J. Herlt. 2001. Long-day induction of flowering in Lolium temulentum involves sequential increases in specific gibberellins at the shoot apex. Plant Physiol. 127(2):p. 624-632.
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Web URL(s):
http://www.plantphysiol.org/cgi/content/full/127/2/624
    Last checked: 11/2001
    Access conditions: Item is within a limited-access website
http://www.plantphysiol.org/cgi/reprint/127/2/624
    Last checked: 06/09/2008
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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