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 AgroParisTech université Paris-Saclay

Welcome to ECOSYS

UMR ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes

Poster 1 :Ramification_Colza_2015

Poster 1
Alexandra Jullien, Alain Fortineau, Amélie Mathieu, Jean-Michel Allirand, Michaël Chelle

Branching regulation by Red/Far-Red ratio in Brassica napus L.

Branching is a key process of plant architecture and yield because it determines the number of inflorescences and pods. In the field, the main identified factors that triggers or repress branching are the competition for light and red to far-red ratio. The objective of the study is to characterize the answer of the plant to a reduction of this red to far-red ratio. Two different devices were used: blue filter and far-red diodes. A major concern was to disentangle the effect of light quality and light quantity. Three experiments were carried out for plants in a pot placed in a mini-greenhouse made of (i) blue filters that reduces the red to far-red ratio as well as light quantity, (ii) filter that reduces the light quantity but not the red to far-red ratio and (iii) without any filter. We observed no reduction in the number of branches in the plants grown under reduction of light quantity and red to far-red ratio. However, plants presented characteristics of the shade-avoidance response: higher stem, and longer ramifications. Plants with far-red diodes did not bear branches at the base of their stem that was longer than the one of the Control plants. Isolated plants grown in the field presented a bushy port. Results confirmed that red to far-red ratio triggers or represses branching in for Winter Oilseed Rape. The plant response seems global with filter device, while more focused on branching using diode device. Further characterizations on biomass allocation within the different architectures obtained could help understanding plant response and the interaction with the C functioning.

Document à télécharger (sécurisé)