Effect of soil copper accumulation on proliferation and survival of rhizobia

Two strains of the fast-growing bean rhizobia- PV1 and PV2 and two others of the slow-growing cowpea and soybean bradyrhizobia- CP1 and GM8 respectively, were used to test their in vitro proliferation and in vivo survival. Known amounts of each of the four strains studied were exposed to Cu concentrations in the range:- 0, 20, 40, 60, 80 and 100 ppm both in vitro and in vivo. It was observed that slow-growing rhizobia are more susceptible to Cu toxicity both in vitro and in vivo than the fast-growing rhizobia.It is important however to assess the effect of copper on nodulation and nitrogen fixing.
Deux souches de haricots rhizobia-PV1 et PV2 de croissance rapide et respectivement deux autres du niébé et de soja bradyrhizobiums-CP1 et GM8 de croissance lente, ont été utilisés pour tester leur prolifération in vitro et leur survie in vivo.Des quantités connues de chacune des quatre souches étudiées ont été exposées à des concentrations en Cu dans la fourchette suivante: - 0, 20, 40, 60, 80 et 100 ppm à la fois in vitro et in vivo. Il a été observé que les rhizobiums à croissance lente sont plus sensibles à la toxicité du Cu in vitro et in vivo que les rhizobiums à croissance rapide.Il est toutefois important d’évaluer l’effet du cuivre sur la nodulation et la fixation de l’azote.
Date of publication: 
Region Focus: 
East Africa
RUFORUM Conferences and Workshops
Licence conditions: 
Open Access
Access restriction: 
Printed resource

About the RUFORUM 2010 Biennal Conference
"The 2010 RUFORUM Biennial Conference was the second in the series. The main objective of the Biennial conferences is to provide a platform for agricultural research for development stakeholders in Africa and beyond to actively exchange findings and experiences, while at the same time learning lessons towards improving performance of the agricultural sector and ultimately people’s livelihoods. The biennial conference is RUFORUM’s most comprehensive meeting for the diversity of stakeholders in agriculture. It is especially dedicated to graduate students and their supervisors, grantees in RUFORUM member universities and alumni. It is a platform for peer review, quality control, mentorship, networking and shared learning. This record contains an extended abstract accepted under the theme of Natural Resource Management"