Strigolactones stimulate internode elongation independently of Gibberellins

de Saint Germain, Alexandre, Ligerot, Yasmine, Dun, Elizabeth A., Pillot, Jean-Paul, Ross, John J., Beveridge, Christine A. and Rameau, Catherine (2013) Strigolactones stimulate internode elongation independently of Gibberellins. Plant Physiology, 163 2: 1012-1025. doi:10.1104/pp.113.220541


Author de Saint Germain, Alexandre
Ligerot, Yasmine
Dun, Elizabeth A.
Pillot, Jean-Paul
Ross, John J.
Beveridge, Christine A.
Rameau, Catherine
Title Strigolactones stimulate internode elongation independently of Gibberellins
Journal name Plant Physiology   Check publisher's open access policy
ISSN 0032-0889
1532-2548
Publication date 2013-10-01
Year available 2013
Sub-type Article (original research)
DOI 10.1104/pp.113.220541
Open Access Status DOI
Volume 163
Issue 2
Start page 1012
End page 1025
Total pages 14
Place of publication Rockville, MD, United State
Publisher American Society of Plant Biologists
Language eng
Abstract Strigolactone (SL) mutants in diverse species show reduced stature in addition to their extensive branching. Here, we show that this dwarfism in pea (Pisum sativum) is not attributable to the strong branching of the mutants. The continuous supply of the synthetic SL GR24 via the root system using hydroponics can restore internode length of the SL-deficient rms1 mutant but not of the SL-response rms4 mutant, indicating that SLs stimulate internode elongation via RMS4. Cytological analysis of internode epidermal cells indicates that SLs control cell number but not cell length, suggesting that SL may affect stem elongation by stimulating cell division. Consequently, SLs can repress (in axillary buds) or promote (in the stem) cell division in a tissue-dependent manner. Because gibberellins (GAs) increase internode length by affecting both cell division and cell length, we tested if SLs stimulate internode elongation by affecting GA metabolism or signaling. Genetic analyses using SL-deficient and GA-deficient or DELLA-deficient double mutants, together with molecular and physiological approaches, suggest that SLs act independently from GAs to stimulate internode elongation.
Formatted abstract
Strigolactone (SL) mutants in diverse species show reduced stature in addition to their extensive branching. Here, we show that this dwarfism in pea (Pisum sativum) is not attributable to the strong branching of the mutants. The continuous supply of the synthetic SL GR24 via the root system using hydroponics can restore internode length of the SL-deficient rms1 mutant but not of the SL-response rms4 mutant, indicating that SLs stimulate internode elongation via RMS4. Cytological analysis of internode epidermal cells indicates that SLs control cell number but not cell length, suggesting that SL may affect stem elongation by stimulating cell division. Consequently, SLs can repress (in axillary buds) or promote (in the stem) cell division in a tissue-dependent manner. Because gibberellins (GAs) increase internode length by affecting both cell division and cell length, we tested if SLs stimulate internode elongation by affecting GA metabolism or signaling. Genetic analyses using SL-deficient and GA-deficient or DELLA-deficient double mutants, together with molecular and physiological approaches, suggest that SLs act independently from GAs to stimulate internode elongation.
Keyword Plant Sciences
Plant Sciences
PLANT SCIENCES
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
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