Plant growth promoting bacteria as a biotechnological alternative to induce rooting of avocado (Persea americana) rows

Abstract

In order to evaluate the effect of the application of native strains of indole acetic acid (AIA)
producing bacteria on the formation of radical primordia of avocado etiolate shoots, seven
bacterial strains were isolated from soil of avocado rhizosphere. Soil samples were collected
in San Juan Elotepec, Villa Sola de Vega, Oaxaca in Mexico. Pure cultures of the three strains
with the highest yielding capacity and their mixtures were prepared (concentration equivalent
to 300-350 X 106 cells mL-1 in McFarland scale). Two forms of application were tested: to the
substrate and with a brush directly on the wound, besides the application to the substrate. In
the studied conditions, only the treatment Cepa 1+Cepa 6 combination stimulated the rooting
of avocado lines. Promote the presence and activity of this kind of bacteria in soil is important
because of their impact on the establishment and development of plants in an agroecosystem.