期刊
FEMS MICROBIOLOGY ECOLOGY
卷 87, 期 2, 页码 543-555出版社
OXFORD UNIV PRESS
DOI: 10.1111/1574-6941.12244
关键词
Azospirillum; cooperation; plant growth-promoting rhizobacteria; rice; transcriptome
类别
资金
- 'Region Rhone-Alpes'
- 'Ministere de l'enseignement superieur et de la recherche'
- ANR [ANR-08-BLAN-0098]
- Agence Nationale de la Recherche (ANR) [ANR-08-BLAN-0098] Funding Source: Agence Nationale de la Recherche (ANR)
Azospirillum-plant cooperation has been mainly studied from an agronomic point of view leading to a wide description of mechanisms implicated in plant growth-promoting effects. However, little is known about genetic determinants implicated in bacterial adaptation to the host plant during the transition from free-living to root-associated lifestyles. This study aims at characterizing global gene expression of Azospirillumlipoferum 4B following a 7-day-old interaction with two cultivars of Oryza sativa L. japonica (cv. Cigalon from which it was originally isolated, and cv. Nipponbare). The analysis was done on a whole genome expression array with RNA samples obtained from planktonic cells, sessile cells, and root-adhering cells. Root-associated Azospirillum cells grow in an active sessile-like state and gene expression is tightly adjusted to the host plant. Adaptation to rice seems to involve genes related to reactive oxygen species (ROS) detoxification and multidrug efflux, as well as complex regulatory networks. As revealed by the induction of genes encoding transposases, interaction with root may drive bacterial genome rearrangements. Several genes related to ABC transporters and ROS detoxification display cultivar-specific expression profiles, suggesting host specific adaptation and raising the question of A.lipoferum 4B/rice cv. Cigalon co-adaptation.
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