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: https://www.ghostery.com/fr/products/

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: http://www.youronlinechoices.com/fr/controler-ses-cookies/, 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

Realytics
Google Analytics
Spoteffects
Optimizely

Targeted advertising cookies

DoubleClick
Mediarithmics

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 cil-dpo@inra.fr or by post at:

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

Dernière mise à jour : Mai 2018

Menu Logo Principal Agrocampus Ouest Angers University

Home Page

Determinism of bacterial transmission to seeds

Transmission to seeds is a critical step in the ecology of many plant pathogenic bacteria, but also in the epidemiology of bacterial plant diseases. Bacteria survive in/on seeds for a long time, sometimes longer than the lifetime of the seed itself. According to the pathogen, contaminated seeds may represent the major source of inoculum in the field. Blocking this inoculum source is thus a major goal to efficiently control seed-transmitted bacterial diseases. In order to identify and characterize the molecular determinants involved in the transmission of Xanthomonas axonopodis pv. phaseoli to bean (Phaseolus vulgaris L.) seeds, we developed random and targeted strategies. Techniques used numerous biotests, and functional studies.

  

 

transmission graine/bacterie

The various ways used by plant pathogenic bacteria to infect seeds.

Recent results in EmerSys showed that various ways can be used by plant pathogenic bacteria to infect seeds. In a compatible situation, transmission to seeds mainly occurs through the stigma (floral pathway), but also through the vascular system. In  an incompatible interaction, , transmission to seeds only occurs through the floral pathway. Functional approaches demonstrated that the transmission through the floral pathway is dependent on a functional Type 3 secretion system, and also of the ability of bacterial strains to aggregate. Alternatively, transmission through the floral pathway involves the Type 3 secretion system, but does not involve the ability of bacteria to aggregate. Finally, studies by EmerSys highlighted the occurrence of a non-host carriage: germinated seeds may be colonized on their surface by non-host bacteria such as E.coli. The multiplication of these bacteria during non-host carriage may reach levels similar to that of plant pathogenic bacteria on their hosts. This is due to the lack of induction od defense reactions on the germinated seeds in response to the colonization by bacteria.

See also

Ici, les autres thématiques de l'équipe