Ammonium assimilation and ureide metabolism in common bean (Phaseolus vulgaris) nodules under salt stress Mariam Khadri, Lina Pliego, Mariam Soussi, Carmen Lluch and Antonio Ocaña Agronomie, 21 6-7 (2001) 635-643 DOI: 10.1051/agro:2001155