Skip to Main content Skip to Navigation
Theses

Variations métaboliques du maïs lors de l’association coopérative avec la bactérie phytostimulatrice Azospirillum lipoferum CRT1

Abstract : Plant growth-promoting rhizobacteria (PGPR) of the genus Azospirillum are used commercially for their capacity to stimulate the growth and enhance the yield of cereal crops via an intricate, complex and poorly understood associative relationship. The aim of this study was to use modern metabolomics tools to decipher the biochemical mechanisms activated by A. lipoferum CRT1 in its maize host.The analysis of the phytochemical contents of roots, leaves and ascending sap revealed for the first time the importance of root-to-shoot communication and of simple sugars in the enhancement of growth and photochemical conversion potential of young plantlets by A. lipoferum CRT1. A transcriptomic analysis showed moderate impact on roots and a coordinate modulation of several regulatory nodes of cellular biological processes, including some mediated by auxins and abscissic acid. Agronomic field trials conducted two consecutive years in four sites correlated yield enhancement by A. lipoferum CRT1 to the securing of seed germination during environmental stresses. No correlation was found with modifications of plantlets metabolomes (including those linked to nitrogen and phosphorus nutrition), growth and photochemical conversion potential which were found to depend on additional soil and climate cues. Germination securing was due to a speeding of radicule emergence and of seed simple sugars consumption
Document type :
Theses
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-01718865
Contributor : Abes Star :  Contact
Submitted on : Tuesday, February 27, 2018 - 5:26:06 PM
Last modification on : Tuesday, March 17, 2020 - 3:08:14 AM
Long-term archiving on: : Monday, May 28, 2018 - 2:18:43 PM

File

TH2017ROZIERCAMILLE.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01718865, version 1

Collections

Citation

Camille Rozier. Variations métaboliques du maïs lors de l’association coopérative avec la bactérie phytostimulatrice Azospirillum lipoferum CRT1. Biologie végétale. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSE1296⟩. ⟨tel-01718865⟩

Share

Metrics

Record views

598

Files downloads

2598