Inhibition of primary roots and stimulation of lateral root development in Arabidopsis thaliana by the rhizobacterium Serratia marcescens 90-166 is through both auxin-dependent and -independent signaling pathways

Molecules and Cells
Chun-Lin ShiChoong-Min Ryu

Abstract

The rhizobacterium Serratia marcescens strain 90-166 was previously reported to promote plant growth and induce resistance in Arabidopsis thaliana. In this study, the influence of strain 90-166 on root development was studied in vitro. We observed inhibition of primary root elongation, enhanced lateral root emergence, and early emergence of second order lateral roots after inoculation with strain 90-166 at a certain distance from the root. Using the DR5::GUS transgenic A. thaliana plant and an auxin transport inhibitor, N-1-naphthylphthalamic acid, the altered root development was still elicited by strain 90-166, indicating that this was not a result of changes in plant auxin levels. Intriguingly, indole-3-acetic acid, a major auxin chemical, was only identified just above the detection limit in liquid culture of strain 90-166 using liquid chromatography-mass spectrometry. Focusing on bacterial determinants of the root alterations, we found that primary root elongation was inhibited in seedlings treated with cell supernatant (secreted compounds), while lateral root formation was induced in seedlings treated with lysate supernatant (intracellular compounds). Further study revealed that the alteration of root development elicited...Continue Reading

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Citations

Mar 30, 2016·Environmental Science and Pollution Research International·Jaqueline RochaIsabel Henriques
Jun 5, 2018·Critical Reviews in Biotechnology·Swati TyagiPratyoosh Shukla
Jun 10, 2019·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Diogo Neves ProençaPaula V Morais
May 1, 2019·Frontiers in Microbiology·Inès PonsThierry Hance

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