Séminaire IBIP
Les séminaires ont lieu sur le Campus Montpellier SupAgro/INRA de La Gaillarde (2, place P. Viala Montpellier)

Jeudi 4 septembre 2008
Amphi 208 (Cœur d’Ecole) à 14h

Regulatory Network of MicroRNA399 and PHO2 by Systemic Signaling

Tzyy-Jen Chiou
Agricultural Biotechnology Research Center, Academia Snica, Taiwan

We have previously demonstrated that miR399s control phosphate (Pi) homeostasis by regulating the expression of a ubiquitin-conjugating E2 enzyme (UBC24/PHO2) in Arabidopsis. Changes in miR399-dependent PHO2 gene expression modulate Pi uptake, allocation and remobilization. More recently, we provided evidence that miR399s are able to move in the phloem stream and across grafting junctions from the scions overexpressing miR399 to the wild-type rootstocks. Movement of miR399s serves as a long-distance signal to report and balance the Pi status between shoots and roots. The regulation of miR399 and PHO2 via long-distance communication in response to Pi deficiency will be discussed.

Contact : Jean-Francois Briat

Contacts IBIP :
Sabine Zimmermann
Marc Lepetit
Corinne Dasen
Chantal Baracco