Resumo

SOLER ARANGO, Juliana; POSADA URIBE, Luisa Fernanda  e  PEREZ NARANJO, Juan Carlos. Differential Distrubution of Candidadate Biocontrol Bacteria against Spongospora subterranea in Potato Plants (Solanum tuberosum cv. Diacol Capiro). Rev. Fac. Nac. Agron. Medellín [online]. 2012, vol.65, n.1, pp.6337-6348. ISSN 0304-2847.

Abstract. Searching for promising microorganisms to biocontrol soil-borne plant pathogens has been often focused on producers of hormone and lytic enzymes, since these traits are linked to plant growth promotion. However, the environment from inner roots to bulk soil is quite variable, and little is known about the spatial distribution of microorganisms expressing these desirable traits. Using potato plants (Solanum tuberosum var. Diacol Capiro) from a farmers field, in this research we obtained bacteria from inside roots, rhizosphere, tubers peel or bulk soil, and determined in them the production of indol and chitinases. In general, bacteria isolated form inside the roots showed the highest production of total indols and chitinases. Simultaneous high production of both compounds was not detected in these isolates, and the frecuency of bacteria producing both, indol and chitinases was higher in roots and rhizosphere, compared to tubers peel and bulk soil samples. These results suggest that in soil, the distribution of microorganisms and functions linked to biocontrol are not randomly distributed. These findings might be usefull to guide the search for biocontrol agents, optimize resource use and speed up the development of new bioproducts.

Palavras-chave : Biological control; plant growth and development; phytohormones; hydrolytic enzymes.

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