Phosphorus Shortage Induces an Increase in Root Exudation in Fifteen Eucalypts Species

A significant proportion of the carbon fixed by plants is transported to roots and exuded rhizosphere. Exudates may have important roles in rhizosphere, such as desorbing labile phosphorus (P) or mobilizing manganese (Mn) other metal cations. This study evaluated root exudation profiles seedlings 15 eucalypt species response a P shortage if ability exude organic compounds was related Mn accumulation shoots. The were grown on sand irrigated with nutrient solutions containing either sufficient (500 µM) low (25 µM). Organic acids (OA), amino acids/polyamines, phenolics analyzed exudates UPLC-MS/MS. Plants level had leaf contents growth reduction. induced three groups metabolites at higher levels than availability. Despite that, composition pattern similar among under concentrations. Citric isocitric major OAs found exudates, followed oxalic, malic, succinic acids. Among acids/polyamines identified, putrescine most abundant all species, glycine. Cinnamic acid predominant phenolic exudates. Our results indicate that limitation induces conserved genetic mechanism eucalypts. Such can be further investigated adapt commercial clones soils