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Strigolactones stimulate internode elongation independently of gibberellins

journal contribution
posted on 2023-05-17, 20:34 authored by de Saint Germain, A, Ligerot, Y, Dun, EA, Pillot, J-P, John RossJohn Ross, Beveridge, CA, Rameau, C
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 tissuedependent 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 GAdeficient or DELLA-deficient double mutants, together with molecular and physiological approaches, suggest that SLs act independently from GAs to stimulate internode elongation.

History

Publication title

Plant Physiology

Volume

163

Pagination

1012-1025

ISSN

0032-0889

Department/School

School of Natural Sciences

Publisher

Amer Soc Plant Biologists

Place of publication

Rockville, USA

Rights statement

Copyright 2013 American Society of Plant Biologists

Repository Status

  • Restricted

Socio-economic Objectives

Field grown vegetable crops

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