INVESTIGADORES
CASTAGNO Luis Nazareno
artículos
Título:
Comparative symbiotic performance of native rhizobia of the Flooding Pampa and strains currently used for inoculating Lotus tenuis in this region
Autor/es:
SANNAZZARO AI; BERGOTTINI VM; PAZ RC; CASTAGNO LN; MENÉNDEZ AB; RUIZ OA; PIECKENSTAIN FL; ESTRELLA MJ
Revista:
ANTON LEEUW INT. J. G.
Editorial:
SPRINGER
Referencias:
Año: 2011 vol. 99 p. 371 - 379
ISSN:
0003-6072
Resumen:
The
Flooding Pampa (FP) is the most important area for cattle breeding in
Argentina. In this region, persistence and yield of typical forage
legumes are strongly limited by soil salinity and alkalinity, which
affect around 30% of the total area. Instead, naturalized Lotus tenuis is the main forage legume in this region. Rhizobial strains currently used for inoculating L. tenuis in
the FP are exotic or native from non-saline soils of this region,
their taxonomic identity being unknown. Assuming that rhizobia native
from the most restrictive environments are well adapted to adverse
conditions, the use of such isolates could improve the productivity of L. tenuis in the FP. Hence, the goal of this study was to evaluate the symbiotic efficiency of selected L. tenuis rhizobia
native from the FP, as compared with strains currently used for
field inoculation of this legume. Under non-stressing conditions, the
symbiotic performance of native strains of FP exceeded those ones
currently used for L. tenuis.
Moreover, the symbiotic performance of the native strain ML103 was
considerably high under salt stress, compared with strains currently
used as inoculants. Analysis of 16S rRNA gene sequencing revealed that
unclassified rhizobia currently used for field inoculation of L. tenuis and native strains grouped with the genus Mesorhizobium.
As a whole, results obtained demonstrate that soils of the FP are a
source of efficient and diverse rhizobia that could be used as a
sustainable agronomic tool to formulate inoculants that improve forage
yield of L. tenuis in this region.