title: Nodule conductance varied among common bean (Phaseolus vulgaris) genotypes under phosphorus deficiency.
abstract: Common bean genotypes BAT477, COCOT, DOR364, Flamingo, and NAG310 were inoculated with Rhizobium tropici CIAT899 and grown under phosphorus deficiency. This treatment induced a significant decrease in shoot and nodule growth that varied among genotypes from 35% to 57% and from 45% to 61%, respectively, whereas root biomass was less affected. Phosphorus deficiency affected differently the genotypes for nodule number and size, and the responses of nodulated-root O2 uptake (Conr) to raising rhizospheric PO2. From the later data, nodule conductance could be computed by dividing the slope of the regression of Conr as a function of external pO2 by nodule surface area. It is concluded that differences in nodule conductance are related to genotypic tolerance to P deficiency.
authors.affiliation: Laboratoire Interaction Légumineuses Microorganismes, Institut National de Recherche Scientifique et Technique, BP 95, 2050 Hammam Lif, Tunisia.
authors.forename: Moez
authors.initials: M
authors.lastname: Jebara
authors.forename: Mohamed Elarbi
authors.initials: ME
authors.lastname: Aouani
authors.forename: Hélène
authors.initials: H
authors.lastname: Payre
authors.forename: Jean-Jacques
authors.initials: JJ
authors.lastname: Drevon
mesh_terms: D010101:Oxygen Consumption; D027805:Phaseolus / Q000187:drug effects / Q000254:growth & development* / Q000382:microbiology; D010758:Phosphorus / Q000172:deficiency*; D010935:Plant Diseases / Q000382:microbiology; D018517:Plant Roots / Q000254:growth & development; D018520:Plant Shoots / Q000254:growth & development; D012231:Rhizobium / Q000472:pathogenicity
chemical_list: D010758:Phosphorus