Phaseolus vulgaris-Rhizobia Symbiosis Increases the Phosphorus Uptake and Symbiotic N2 Fixation Under Insoluble Phosphorus

Abstract

Five north Tunisian native rhizobia were tested in symbiosis with Coco-blanc' variety under two phosphorus (P) supplies [P-sufficient and insoluble P (IP)] at 250mol P plant(-1). At flowering stage, responses against IP were assessed and indicated that inoculation with P.Ps.09 produced a high nodule biomass (0.12g). Similarly, P.Tb.09 produced 0.08g nodule biomass under both P and P.Bj.09 that significantly increased nodule number under IP. Shoot biomass exhibited high dry weight with P.Tb.09 and CIAT899 (1.6g plant(-1)). Inoculation with CIAT899 produced a high root biomass under both P. Analysis of a halo diameter of clear zone rounding each colony under IP indicated that P.Tb.09 has developed high halo O (1.7cm). These variations were associated under IP with a decrease of pH by P.Ar.09 and with increase in shoot phosphatase activity by P.Ar.09, P.Bj.09, P.OM.09 and P.Ps.09. The use of P-efficient rhizobia may constitute an adaptive mechanism against P-deficiency tolerance.

Keywords

insoluble phosphorus; nitrogen; Phaseolus vulgaris; acid phosphatase; rhizobia

Published in

Journal of Plant Nutrition
2014, volume: 37, number: 5, pages: 643-657
Publisher: TAYLOR & FRANCIS INC

SLU Authors

• Bargaz, Adnane

  • Cadi Ayyad University (University of Marrakesh)

UKÄ Subject classification

Plant Biotechnology
Agricultural Science

Publication identifier

• DOI: https://doi.org/10.1080/01904167.2013.872275

Permanent link to this page (URI)

https://res.slu.se/id/publ/59813