Know more

Our use of cookies

Cookies are a set of data stored on a user’s device when the user browses a web site. The data is in a file containing an ID number, the name of the server which deposited it and, in some cases, an expiry date. We use cookies to record information about your visit, language of preference, and other parameters on the site in order to optimise your next visit and make the site even more useful to you.

To improve your experience, we use cookies to store certain browsing information and provide secure navigation, and to collect statistics with a view to improve the site’s features. For a complete list of the cookies we use, download “Ghostery”, a free plug-in for browsers which can detect, and, in some cases, block cookies.

Ghostery is available here for free:

You can also visit the CNIL web site for instructions on how to configure your browser to manage cookie storage on your device.

In the case of third-party advertising cookies, you can also visit the following site:, offered by digital advertising professionals within the European Digital Advertising Alliance (EDAA). From the site, you can deny or accept the cookies used by advertising professionals who are members.

It is also possible to block certain third-party cookies directly via publishers:

Cookie type

Means of blocking

Analytical and performance cookies

Google Analytics

Targeted advertising cookies


The following types of cookies may be used on our websites:

Mandatory cookies

Functional cookies

Social media and advertising cookies

These cookies are needed to ensure the proper functioning of the site and cannot be disabled. They help ensure a secure connection and the basic availability of our website.

These cookies allow us to analyse site use in order to measure and optimise performance. They allow us to store your sign-in information and display the different components of our website in a more coherent way.

These cookies are used by advertising agencies such as Google and by social media sites such as LinkedIn and Facebook. Among other things, they allow pages to be shared on social media, the posting of comments, and the publication (on our site or elsewhere) of ads that reflect your centres of interest.

Our EZPublish content management system (CMS) uses CAS and PHP session cookies and the New Relic cookie for monitoring purposes (IP, response times).

These cookies are deleted at the end of the browsing session (when you log off or close your browser window)

Our EZPublish content management system (CMS) uses the XiTi cookie to measure traffic. Our service provider is AT Internet. This company stores data (IPs, date and time of access, length of the visit and pages viewed) for six months.

Our EZPublish content management system (CMS) does not use this type of cookie.

For more information about the cookies we use, contact INRA’s Data Protection Officer by email at or by post at:

24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

Menu Logo Principal Agrocampus Ouest Rennes 1 University Logo Igepp

Home page

Aude Rochefort

The Brassica napus seed microbiota: assemblage, transmission and contribution to plant response to a soilborne fungal pathogen

Thèse débutée le 1er novembre 2017 - Defended in November, 26th, 2020.
Financement : Métaprogramme MEM / Région Bretagne
Encadrant : Alain Sarniguet



Plant microbiota can modulate host fitness. Understanding the ecological processes that drive its assembly is a prerequisite for promoting plant growth and health via the manipulation of its composition. Seed and soil are two main sources of plant microbiota inoculum and are therefore critical for its assembly. In this thesis, we showed that the structure of the seed microbiota of Brassica napus is primarily shaped by the environment and to a lesser extent by host genotype. The output of community coalescence between seed and soil microbiota was assessed with soils of contrasting microbial diversity and with distinct seed samples. Soil diversity but not seed diversity modulates seedling microbiota structure in roots and stems. Overall, seedling favors the emergence of seed- and soil-borne rare taxa. Impact of these different levels of initial diversity on a plant disease were monitored during inoculation with the pathogenic fungus Rhizoctonia solani. The soil of high diversity promotes disease reduction for one particular seed lot, giving rise for a role of the seed microbiota. No link between initial seed microbiota, seedling microbiota and disease could be established. The transmission of bacterial synthetic communities was subsequently monitored. Their inoculation on seed influences seedling microbial diversity and disease. Coalescence knowledge, transmission of rare taxa from seed to seedling and synthetic community using, give new inputs to drive seedling microbiota assembly and disease reduction.


seed microbiota, soil microbiota, coalescence, synthetic communities, culturomics, fungal disease

Poster au format pdf

Rochefort Aude poster