INVESTIGADORES
RUIZ oscar Adolfo
congresos y reuniones científicas
Título:
Lotus associated soil microorganism in agricultural practices. Communities stability and technology use
Autor/es:
SUSANA A. NIEVA; MATÍAS BAILLERES; ANDRÉS GARRIZ; CRISTIAN ANTONELLI; MARÍA P. CAMPESTRE; MARÍA J. CORRIALE; MARÍA E. LLAMES; ANA B. MENÉNDEZ; OSCAR A. RUIZ
Lugar:
LONDRINA
Reunión:
Conferencia; XXVII Reunión Latinoamericana de Rizobiologia; 2016
Institución organizadora:
ALAR- ASOCIACIÓN LATINOAMERICANA DE RIZOBIOLOGÍA
Resumen:
The forage legume Lotus tenuis is an appealing alternative to meet the needs for cattle production in the Flooding Pampa region, Argentina. The use of chemical compounds for agriculture practices, in addition to the removal of native vegetation, eventually may change the diversity of other ecosystem components such as bacterial communities. To examine the effect of L. tenuis promotion with herbicides on the soil bacterial community and taxonomic composition, we studied three different rangeland sites of the Flooding Pampa region. At each site, two paddocks were compared: one managed to promote the forage legume L. tenuis and the other lacking of management history and hence, covered by natural grasses. To asses bacterial diversity we used 454-FLX pyrosequencing technology of the V4 region of the 16S rRNA gene and ITS region, on genomic DNA extracted from soil samples. Our results suggest that 5-6 years of land use with L. tenuis promotion does not affect the bacterial community structure in this ecosystem, evidenced in the non-differences between the treatments for diversity indices there are a lot of soil microorganism living inside plant tissues. Endophytes microorganism provide a wide range of benefits to their hosts, as nutrient availability, protection from herbivores and pathogens, inorganic carbon and nitrogen fixation and others.. Its potential use as biofertilizers can become a sustainable low-cost technology. However it has been shown that endophytes-plant interactions are highly variable in the ecosystem, occurring along the continuum from antagonistic to mutualistic interactions. Fungal endophytes isolated from lotus roots were evaluated according their phosphate solubilizing capability and tolerance to soil extreme conditions. Our results, shown that several strains grow well, in a wide pH range and salinity conditions. Two Lotus species were infected by one of the isolated strains. The interaction effect was contrasting between them, evidenced by a growth promotion in one versus a decrease in biomass production in the other one. These results suggest that the use of fungal endophytes as biofertlizers should be studied in depth before its use in a specific host.