Cellular iron homeostasis and metabolism in plant

International audienc

Mechanisms of iron homeostasis in plants and their regulations

Iron dynamics in plants results from complex mechanisms involving the integration of transporter activities, with the synthesis of chelating molecules. Under iron deficient conditions, two types of high affinity transport systems are activated, depending on the plant family considered. In non grass plants, Fe(III)-chelate reduction is followed by Fe(II) uptake, whereas in grasses, Fe(III) chelated to secreted phytosiderophores is taken up by roots. Long distance allocation of iron between organs and tissues, as well as its subcellular compartimentation and remobilization, also involve various chelation and reduction activities, associated to transporters and to soluble proteins storing and buffering this metal. This iron trafficking at the whole plant, cellular, and sub-cellular levels, is a highly regulated process starting to be characterized at a molecular level. To maintain iron homeostasis is an important determinant to build up prosthetic groups such as heme and Fe-S clusters, and to assemble them into apoproteins. Such processes require complex protein machineries which are mitochondria and plastids located. An essential, and plant specific, role of these iron dynamics is evidenced by the strong iron requirement for the photosynthetic reaction to take place

Impairment of respiratory chain under nutrient deficiency in plants: does it play a role in the regulation of iron and sulfur responsive genes?

Plant production and plant product quality strongly depend on the availability of mineral nutrients. Among them, sulfur (S) and iron (Fe) play a central role, as they are needed for many proteins of the respiratory chain. Plant mitochondria play essential bioenergetic and biosynthetic functions as well as they have an important role in signaling processes into the cell. Here, by comparing several transcriptomic data sets from plants impaired in their respiratory function with the genes regulated under Fe or S deficiencies obtained from other data sets, nutrient-responsive genes potentially regulated by hypothetical mitochondria' retrograde signaling pathway are evidenced. It leads us to hypothesize that plant mitochondria could be, therefore, required for regulating the expression of key genes involved both in Fe and S metabolisms

Pourquoi et comment améliorer la nutrition en fer des plantes

Pourquoi et comment améliorer la nutrition en fer des plantes. Les Rencontres 2012 du Pôle de Compétitivité Qualiméditerrané

Plant Science : Its Role in Biology

Plant Science : Its Role in Biology . International Society for the History, Philosophy and Social Studies of Biology (ISHPSSB

Cellular iron homeostasis : an overview

Cellular iron homeostasis : an overview. 16th International Symposium on Iron Nutrition and Interactions in Plant

Mechanisms of iron homeostasis in plants and their regulations

Iron dynamics in plants results from complex mechanisms involving the integration of transporter activities, with the synthesis of chelating molecules. Under iron deficient conditions, two types of high affinity transport systems are activated, depending on the plant family considered. In non grass plants, Fe(III)-chelate reduction is followed by Fe(II) uptake, whereas in grasses, Fe(III) chelated to secreted phytosiderophores is taken up by roots. Long distance allocation of iron between organs and tissues, as well as its subcellular compartimentation and remobilization, also involve various chelation and reduction activities, associated to transporters and to soluble proteins storing and buffering this metal. This iron trafficking at the whole plant, cellular, and sub-cellular levels, is a highly regulated process starting to be characterized at a molecular level. To maintain iron homeostasis is an important determinant to build up prosthetic groups such as heme and Fe-S clusters, and to assemble them into apoproteins. Such processes require complex protein machineries which are mitochondria and plastids located. An essential, and plant specific, role of these iron dynamics is evidenced by the strong iron requirement for the photosynthetic reaction to take place

Régulation de l'expression des gènes de ferritines végétales en réponse à des signaux de l'environnement et du développement

MONTPELLIER-BU Sciences (341722106) / SudocSudocFranceF

Les sols et la vie souterraine : Des enjeux majeurs en agroécologie

Les sols et la vie souterraine : Des enjeux majeurs en agroécologi