Effects of sheared-root inoculum of Glomus intraradices on wheat grown at different phosphorus levels in the field

Distribution of Arbuscular Mycorrhizal Fungi in Upland Field Soil of Japan: 2. Spore Density of Arbuscular Mycorrhizal Fungi and Infection Ratio in Soybean and Maize Fields

“…In the present study, a high positive correlation was observed between the infection ratio and the density of AM fungi spores in the soil, while a negative correlation was observed between the infection ratio and the amount of available phosphorus in the soybean fi eld (Table 5). These results are in general agreement with previous reports (Giovannetti, 1985;Tawaraya et al, 1995;Wuen et al, 2002;Mohammad et al, 2004). In addition, the presence of crop roots that can be infected by AM fungi is another important factor for increasing spore density because the AM fungi do not form spores unless the plant roots are infected by the fungi.…”

“…Isobe and Tsuboki (1998) found that the infection rate decreased with the increase in the amount of phosphorus fertilizer. In addition, it was reported that applying phosphorus fertilizer caused a decrease in the density of AM fungal spores in soil (Isobe et al, 1993;Tawaraya et al, 1995;Isobe and Tsuboki, 1997;Mohammad et al, 2004;Lekberg and Koide, 2005). In the present study, a significant, highly negative correlation was observed between the density of AM fungal spores and the content of available phosphorus in the soil from soybean fi elds (Table 4).…”

“…Previously, we found a negative correlation between the density of AM fungal spores and the available phosphorus content of the soil (Isobe et al, 2007). On the other hand, an increase in the available phosphorus content by phosphate fertilizer application has been found to decrease the percentage of roots infected with AM fungi (infection ratio) and the density of fungal spores (Isobe and Tsuboki, 1997;Ryan and Ash, 1999;Mohammad et al, 2004;Lekberg and Koide, 2005), but the relationship between the density of AM fungal spores and infection ratio in different regions or soils has not been studied. We need to determine whether this negative relationship between available phosphorus content of soil and the density of AM fungal spores or the infection ratio holds true in various soil types and environmental conditions.…”

Contribution of Arbuscular Mycorrhizal Fungi (AM Fungi) and Rhizobium Inoculation on Crop Growth and Chemical Properties of Rhizospheric Soils in High Plants

“…Plants receiving a balanced nutrient solution without P consistently had the greatest percentage of root length colonized by AM fungi. It was confirmed the carbon transfer between the root system of neighbouring plants connected by common mycorrhizal network [18]. The interplant hyphal bridges formed by VA mycorrhizal mycelia and confirmed that AM infection can provide channels for direct interplant nutrient transfer.…”

Inoculation with Arbuscular Mycorrhizal Fungi or Crop Rotation with Mycorrhizal Plants Improves the Growth of Maize in Limed Acid Sulfate Soil

“…Arbuscular mycorrhizal fungi (AMF) improve the uptake of immobile mineral nutrients such as phosphate, thereby improving plant growth (Smith and Read, 1997;Usuki and Yamamoto, 2003;Mohammad et al, 2004;Lekberg and Koide, 2005). In ASS, AMF spore density is generally low which impacts root colonization and P uptake (Isobe et al, 2005).…”