Université de Neuchâtel

White lupin has developed a complex strategy to limit microbial degradation of secreted citrate required for phosphate acquisition

Weisskopf, Laure ; Abou-Mansour, Eliane ; Fromin, Nathalie ; Tomasi, Nicola ; Santelia, Diana ; Edelkott, Iris ; Neumann, Günter ; Aragno, Michel ; Tabacchi, Raphael ; Martinoia, Enrico

In: Plant, Cell & Environment, 2006, vol. 29, no. 5, p. 917-927

White lupins (Lupinus albus L.) respond to phosphate deficiency by producing special root structures called cluster roots. These cluster roots secrete large amounts of carboxylates into the rhizosphere, mostly citrate and malate, which act as phosphate solubilizers and enable the plant to grow in soils with sparingly available phosphate. The success and efficiency of such a P-acquisition...

Université de Neuchâtel

Isoflavonoid exudation from white lupin roots is influenced by phosphate supply, root type and cluster-root stage

Weisskopf, Laure ; Tomasi, Nicola ; Santelia, Diana ; Martinoia, Enrico ; Langlade, Nicolas Bernard ; Tabacchi, Raphael ; Abou-Mansour, Eliane

In: New Phytologist, 2006, vol. 171, no. 3, p. 657-668

• The internal concentration of isoflavonoids in white lupin (Lupinus albus) cluster roots and the exudation of isoflavonoids by these roots were investigated with respect to the effects of phosphorus (P) supply, root type and cluster-root developmental stage. • To identify and quantify the major isoflavonoids exuded by white lupin roots, we used high-pressure liquid...

Université de Neuchâtel

Secretion activity of white lupin’s cluster roots influences bacterial abundance, function and community structure

Weisskopf, Laure ; Fromin, Nathalie ; Tomasi, Nicola ; Aragno, Michel ; Martinoia, Enrico

In: Plant and Soil, 2005, vol. 268, no. 1, p. 181-194

White lupin (Lupinus albus L. cv. Amiga) reacts to phosphate deficiency by producing cluster roots which exude large amounts of organic acids. The detailed knowledge of the excretion physiology of the different root parts makes it a good model plant to study plant-bacteria interaction. Since the effect of the organic acid exudation by cluster roots on the rhizosphere microflora is still...