セミナー情報

セミナー情報

Phosphate and metals

演題 Phosphate and metals
講演者 Dr. Laurent Nussame (University of Aix-Marseille,France)
使用言語 English
日時 平成30年10月29日(月曜日) 15:00~16:00
場所 Large Seminar room
内容

Phosphate (Pi) is a major macronutriment for plants which have developed different strategies to  cope with its relative scarcity. It is also an important key factor controlling the availability of many cations in the soil. We will here try to highlight some of the physiological consequences for plant adaptation to Pi deficiency, with a focus on  Pi import and root morphology. Pi uptake relies on the presence of multiple high affinity transporters (PHT1 family) located in the plasma membranes (Nussaume et al., 2011). Multiple steps of transcriptional and post-transcriptional regulations (phosphorylation, degradation) of these transporters were identified illustrating the capacity for plants to tightly control their expression levels in the cells (Misson et al., 2004; Misson et al., 2005; Thibaud et al., 2010; Bayle et al., 2011; Chen et al., 2015). Combining several genetic approaches we have investigated the physiological role of these proteins (Ayadi et al., 2015) and the contribution of specific cell layers to Pi uptake (Kanno et al., 2016). Concerning the root morphology, the Desnos group identified by genetic approches complex signal transduction pathways which modulate the response of the primary roots to Pi/metal balance (Reymond et al., 2006; Svistoonoff et al., 2007; Peret et al., 2014; Balzergue et al., 2017).

References:
Ayadi, A. , et al. (2015). Reducing the Genetic Redundancy of Arabidopsis PHOSPHATE TRANSPORTER1 Transporters to Study Phosphate Uptake and Signaling. Plant Physiol 167; 1511-1526.
Balzergue, C., et al. (2017). Low phosphate activates STOP1-ALMT1 to rapidly inhibit root cell elongation. Nature communications 8, 15300.
Bayle, V., et al. (2011). Arabidopsis thaliana High-Affinity Phosphate Transporters Exhibit Multiple Levels of Posttranslational Regulation. Plant Cell 23; 1523-1535.
Chen, J., et al. (2015). The rice CK2 kinase regulates trafficking of phosphate transporters in response to phosphate levels. Plant Cell 27; 711-723.
Kanno, S., et al. (2016). A novel role for the root cap in phosphate uptake and homeostasis. eLife 5.
Misson, J., et al. (2004). Transcriptional regulation and functional properties of Arabidopsis Pht1;4, a high affinity transporter contributing greatly to phosphate uptake in phosphate deprived plants. Plant Mol Biol 55; 727-741.
Misson, J., et al. (2005). A genome-wide transcriptional analysis using Arabidopsis thaliana Affymetrix gene chips determined plant responses to phosphate deprivation. Proc Natl Acad Sci U S A 102; 11934-11939.
Nussaume, L., et al. (2011). Phosphate Import in Plants: Focus on the PHT1 Transporters. Frontiers in plant science 2; 83.
Peret, B., et al. (2014). Root architecture responses: in search of phosphate. Plant Physiol 166, 1713-1723.
Reymond, M., et al. (2006). Identification of QTL controlling root growth response to phosphate starvation in Arabidopsis thaliana. Plant Cell Environ 29, 115-125.
Svistoonoff, S., et al. (2007). Root tip contact with low-phosphate media reprograms plant root architecture. Nat Genet 39, 792-796.
Thibaud, M.C., et al. (2010). Dissection of local and systemic transcriptional responses to phosphate starvation in Arabidopsis. Plant J 64; 775-789.

問合せ先 植物免疫学 (西條研究室)
西條雄介 (saijo@bs.naist.jp)

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