CO-INOCULATION OF BRADYRHIZOBIUM SP. AND BACILLUS SP. ON PEANUT: EFFECT ON THEIR PLANT GROWTH-PROMOTING ACTIVITIES

FIGUEREDO, MARÍA SOLEDAD; TONELLI, MARÍA LAURA; IBAÑEZ, FERNANDO; FABRA, ADRIANA

Congreso; XXVII Reunion Latinoamericana de Rizobiología; 2016

ALAR

Peanut (Arachis hypogaea L.) is an economically important legume throughout the world and its productivity is affected, among other environmental stresses, by different diseases. A soil-borne fungal disease that adversely affects peanut yields all over the world?s growing areas is root and stem wilt caused by Sclerotium rolfsii. The extensive use of pesticides could contribute to environmental pollution and to an increase in the production cost. Moreover, beneficial microorganisms, including those that fix atmospheric nitrogen, could be negatively affected by this practice. Previous studies in our laboratory demonstrated that the native isolate Bacillus sp. CHEP5 induces systemic resistance in peanut against the pathogen S. rolfsii and primes the activity of the enzyme phenylalanine ammonia-lyase (PAL) when the plant is challenged by the phytopathogen (Tonelli et al. 2011). On the other hand, Bradyrhizobium sp. SEMIA 6144 is able to establish a symbiotic association with peanut plants, inducing the formation of root nodules (Fabra et al. 2010).Since the induction of systemic resistance against phytopathogens and the improvement in nitrogen nutrition are both desirable features for peanut growth promotion, it becomes relevant to evaluate the effect of Bacillus sp. CHEP5 and Bradyrhizobium sp. SEMIA 6144 coinoculation on this legume.