In Vitro propagation of a cuban Arbuscular Mycorrhizal Fungal strain and factible bacteria’s association
Propagación in vitro de una cepa cubana de Hongos Micorrízicos Arbusculares y su factible asociación a bacterias
DOI:
https://doi.org/10.15446/rev.colomb.biote.v24n2.100841Palabras clave:
Arbuscular mycorrhizae, in vitro culture, MSR medium (en)micorriza arbuscular, cultivo in vitro, medio SRM (es)
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In vitro root cultivation techniques based on modified root systems are often used in studies on Arbuscular Mycorrhizal Fungi (AMF). It is a simplified but powerful tool to investigate AMF root colonization and development of the extraradical mycelium. The aim of this study was to establish and characterize the in vitro culture of a Cuban strain of Rhizophagus irregularis (INCAM 11) by using transformed chicory roots. For that, superficially disinfected propagules of R. irregularis were co-culture with the hairy transformed chicory roots on Modified Strullu and Romand (MSR) medium during five months. Spore germination was observed 3-5 days after surface disinfection. The first contact between AMF hyphae and roots occurred 1 - 3 days after germination and a significant production of extensive extraradical mycelium was observed. New spore formation started within 21 - 25 days. After 5 months, 2000 spores could be observed per plate which were able to germinate, colonize, establish and reproduce again spores when associated to young transformed roots of chicory. The most frequent associated microorganism to the in vitro culture of INCAM 11 was isolated and identified as Paenibacillus sp.
Las técnicas de cultivo de raíces in vitro basadas en sistemas de raíces modificadas se utilizan a menudo en los estudios sobre hongos micorrízicos arbusculares (HMA). Es una herramienta simplificada pero poderosa para investigar la colonización de las raíces de los HMA y el desarrollo del micelio extrarradical. El objetivo de este estudio fue establecer y caracterizar el cultivo in vitro de una cepa cubana de Rhizophagus irregularis (INCAM 11) utilizando raíces transformadas de achicoria. Para ello, propágulos de R. irregularis desinfectados superficialmente fueron co-cultivados con las raíces transformadas de achicoria en medio Strullu y Romand modificado (SRM) durante cinco meses. La germinación de las esporas se observó 3-5 días después de la desinfección superficial. El primer contacto entre las hifas y las raíces se produjo entre 1 y 3 días después de la germinación y se observó una producción significativa de micelio extrarradical. La formación de nuevas esporas comenzó entre 21 - 25 días. Después de 5 meses, se pudieron observar 2000 esporas por placa que fueron capaces de germinar, colonizar, establecer y reproducir nuevas esporas cuando se asociaron a raíces jóvenes transformadas de achicoria. El microorganismo asociado frecuentemente al cultivo in vitro de INCAM 11 fue aislado e identificado como Paenibacillus sp.
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