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Strigolactones stimulate internode elongation independently of gibberellins. | LitMetric

Strigolactones stimulate internode elongation independently of gibberellins.

Plant Physiol

Institut Jean-Pierre Bourgin, INRA UMR1318, INRA-AgroParisTech, F-78000 Versailles, France.

Published: October 2013

AI Article Synopsis

Article 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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3793021PMC
http://dx.doi.org/10.1104/pp.113.220541DOI Listing

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