Nodule conductance varied among common bean (Phaseolus vulgaris) genotypes under phosphorus deficiency.
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.
Jebara
Moez
M
Laboratoire Interaction Légumineuses Microorganismes, Institut National de Recherche Scientifique et Technique, BP 95, 2050 Hammam Lif, Tunisia.
Aouani
Mohamed Elarbi
ME
Payre
Hélène
H
Drevon
Jean-Jacques
JJ
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
D010758:Phosphorus