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Transcript
IDENTIFICATION AND CHARACTERIZATION OF AN INTEGRATOR OF THE
PLANT RESPONSES TO IRON AVAILABILITY
Nicolas Tissot 1, Jossia Boucherez 1, Amel Maghiaoui A1, Romain Marcelin 1, Frédéric Gaymard
1, Jean-François Briat 1, Christian Dubos 1, *.
1:
Biochimie et Physiologie Moléculaire des Plantes, INRA, CNRS, Université Montpellier, SupAgro,
Bat 7, 2 place Viala, 34060, Montpellier Cedex 1, France
*[email protected]
The control of iron (Fe) homeostasis is essential in all living organisms. Perturbations of iron uptake,
circulation, metabolism or storage are responsible of various diseases in humans and alter productivity
and product quality of plants. To date, the transcriptional networks involved in response to Fe
deficiency or to Fe excess have been mainly studied separately, and in contrast with mammals, no
integrated picture of the regulation of Fe homeostasis in plants is presently available. Indeed the Febinding haemerythrin RING ubiquitin ligases (e.g. AtBTS, OsHRZ1, OsHRZ2) are viewed as potential
Fe sensors in plants, in the context of Fe deficiency responses. By using various molecular,
physiological and biochemical approaches we have identified a key protein whose activity is involved
in regulating the responses to both Fe deprivation and excess in Arabidopsis thaliana. The potential
role of this protein as a main integrator of the plant responses to Fe availability will be discussed.
Keywords: Iron, Gene expression, Transcription factor, Ferritin, Arabidopsis thaliana