Influence of temperature on colonization of spring barleys by vesicular arbuscular mycorrhizal fungi

Abstract

The effects of three soil temperatures on growth of spring barleys (Hordeum vutgare L.) and on their root colonization by vesicular arbuscular mycorrhizal (VAM) fungi from agricultural soils in Montana (USA) or Syria at different inoculum concentrations were tested in soil incubators in the greenhouse. The number of mycorrhizal plants as well as the proportion and intensity of roots colonized increased with higher soil temperatures. VAM fungi from Montana, primarily Glomus macrocarpum, were cold tolerant at ll°C while those from Syria, primarily G. hoi, were heat tolerant at 26°C. lnoculum potential of Montana VAM fungi was higher than Syrian VAM fungi in cool soils. Harmal, selected from Syrian barley land races, had the highest colonization by mycorrhizal fungi of the cultivars tested.

Habitational abiotic environmental factors alter Arbuscular mycorrhizal composition, species richness and diversity index in Abroma augusta L. (Malvaceae) rhizosphere

“…Yet, it must be borne in mind that these studies are the results of studies conducted in greenhouses. Moreover, AM morpho-species, depending on the occurrence site may express varying degrees of temperature tolerance (Grey 1991). On the other hand, soil pH and available organic carbon (%) of soil had an adverse effect on percent mycorrhizal root colonization; which in contradiction to earlier researches.…”

Diversity, richness and degree of colonization of arbuscular mycorrhizal fungi in coconut cultivated along with intercrops in high productive zone of Kerala, India

“…The abundant and diverse spore population of Glomus spp. revealed in the study indicates a good adaptation of these fungi to a wide range of soil conditions (Grey 1991;Blaszkowski 1993;Ammani et al 1994;Jansa et al 2002;Kowalczyk and Błaszkowski 2011).…”

Evidence for functional divergence in AM fungal communities from different montane altitudes

“…Specifically, temperature is among the strongest selective pressures for many species (Hochdka, 1984;Bennett et al, 1990) and is an ecological variable that affects AMF (Helgason and Fitter, 2009). There is some evidence that isolates of AMF perform best at the temperatures similar to those of their natural habitats (Schenck and Schroder, 1975;Siqueira et al, 1985;Grey, 1991), but opposing evidence indicates no local adaptation of AMF to their native climatic conditions (Lekberg and Koide, 2008;Gavito and Azc on-Aguilar, 2012). Antunes et al (2011) found that the growth of AMF isolates was not directly affected by temperature, but that isolates originating from contrasting climates consistently and differentially altered plant growth responses.…”