Vesicular–arbuscular mycorrhizal infection of Quercus rubra seedlings

Abstract

Summary• The influence of vesicular-arbuscular mycorrhizal ( VAM) host plants is reported on VAM infection of Quercus rubra seedlings, a predominately ectomycorrhizal species.• In a field experiment, Q. rubra seedlings were planted near Quercus montana and Acer rubrum (a VAM host) stump sprouts and near dead Quercus spp. stumps. In a subsequent glasshouse study, seedlings of Q. rubra were grown with or without VAM inoculum ( ± V) and with or without Sorghum bicolor ( ± S), a VAM host.• In the field experiment, seedlings planted near A. rubrum had greater VAM infection than other seedlings; ectomycorrhizal infection was greatest on seedlings near Q. montana . In the glasshouse experiment, VAM infection was increased in both extent (proportion of root length infected in roots of infected seedlings) and frequency (number of seedlings with infection) in the presence of S. bicolor . Seedling mass and N concentration were reduced in the + V treatment; however, these variables were not correlated with extent of VAM infection.• VAM infection of Q. rubra is greatly enhanced in the presence of VAM hosts in both field and glasshouse conditions. No evidence for positive effects of VAM infection on Q. rubra seedlings was found.

Ectomycorrhizal fungal communities in Nothofagus nervosa ( Raulí ): A comparison between domesticated and naturally established specimens in a native forest of Patagonia, Argentina

“…This phenomenon was observed among important forestry species of the genera Eucalyptus (Adjoud-Sadadou and HalliHargas, 2000), Quercus (Dickie et al, 2001), Pinus, Tsuga and Pseudotsuga (Wang and Qiu, 2006), in which both EcM and arbuscular mycorrhizas (AM) were described. Arbuscular mycorrhizas have been registered only in one unique Nothofagus dombeyi tree (Bidartondo et al, 2002), which raises the question of whether both types of mycorrhiza (EcM þ AM) can be found in Nothofagus specimens growing in natural ecosystems.…”

Intraspecific variation in allelochemistry determines an invasive species’ impact on soil microbial communities

“…P. occidentalis and J. nigra form connections with arbuscular mycorrhizal fungi (AMF) (Schultz et al 1981;Schultz and Kormanik 1982), while Q. rubra forms connections with both AMF and ectomycorrhizal fungi (EMF) (Dickie et al 2001). I chose to focus on tree seedlings as previous studies have found woody plants to be most susceptible to the soil-mediated effects of A. petiolata (Stinson et al 2006).…”

Establecimiento de plántulas de Quercus rugosa Née inoculadas con hongos micorrizógenos arbusculares en un bosque templado de México

“…Quercus rugosa presenta en sus raíces asociación con HMA, la asociación micorrícica entre especies del género Quercus y los HMA, ha sido reportada para Q. agrifolia (Egerton-Warburton y Allen, 2001), Q. rubra (Dickie et al, 2001) y Q. ilex (Dias et al, 2010). Dickie et al (2004) han señalado que la colonización micorrícica arbuscular en encinos está asociada a las plantas aledañas.…”

“…El hecho de que no se observaran diferencias significativas en la mayoría de las variables de crecimiento en las plántulas inoculadas con HMA, contrasta con lo reportado por Dickie et al (2001). Estos autores encontraron que la presencia de colonización micorrícica arbuscular en encinos promueve una mejor nutrición o crecimiento en individuos jóvenes de Q. rubra.…”