Gibberellins negatively regulate the development of Medicago truncatula root system View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

Camille Fonouni-Farde, Ambre Miassod, Carole Laffont, Halima Morin, Abdelhafid Bendahmane, Anouck Diet, Florian Frugier

ABSTRACT

The root system displays a remarkable plasticity that enables plants to adapt to changing environmental conditions. This plasticity is tightly linked to the activity of root apical meristems (RAMs) and to the formation of lateral roots, both controlled by related hormonal crosstalks. In Arabidopsis thaliana, gibberellins (GAs) were shown to positively control RAM growth and the formation of lateral roots. However, we showed in Medicago truncatula that GAs negatively regulate root growth and RAM size as well as the number of lateral roots depending at least on the MtDELLA1 protein. By using confocal microscopy and molecular analyses, we showed that GAs primarily regulate RAM size by affecting cortical cell expansion and additionally negatively regulate a subset of cytokinin-induced root expansin encoding genes. Moreover, GAs reduce the number of cortical cell layers, resulting in the formation of both shorter and thinner roots. These results suggest contrasting effects of GA regulations on the root system architecture depending on plant species. More... »

PAGES

2335

Journal

TITLE

Scientific Reports

ISSUE

1

VOLUME

9

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-019-38876-1

DOI

http://dx.doi.org/10.1038/s41598-019-38876-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1112226070

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30787350


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