Arbuscular mycorrhiza improve growth, nitrogen uptake, and nitrogen use efficiency in wheat grown under elevated CO2

Abstract

Effects of the arbuscular mycorrhizal (AM) fungus Rhizophagus irregularis on plant growth, carbon (C) and nitrogen (N) accumulation, and partitioning was investigated in Triticum aestivum L. plants grown under elevated CO2 in a pot experiment. Wheat plants inoculated or not inoculated with the AM fungus were grown in two glasshouse cells with different CO2 concentrations (400 and 700 ppm) for 10 weeks. A (15)N isotope labeling technique was used to trace plant N uptake. Results showed that elevated CO2 increased AM fungal colonization. Under CO2 elevation, AM plants had higher C concentration and higher plant biomass than the non-AM plants. CO2 elevation did not affect C and N partitioning in plant organs, while AM symbiosis increased C and N allocation into the roots. In addition, plant C and N accumulation, (15)N recovery rate, and N use efficiency (NUE) were significantly higher in AM plants than in non-AM controls under CO2 enrichment. It is concluded that AM symbiosis favors C and N partitioning in roots, increases C accumulation and N uptake, and leads to greater NUE in wheat plants grown at elevated CO2.

Effect of native arbuscular mycorrhiza fungi inocula on the growth of Cowpea [<i>Vigna unguiculata</i> (L.) Walp.] in three differents agro ecological zones in Burkina Faso

“…The improvement of KVX growth by inoculation could be the effect of the improvement of host plant hydro mineral nutrition. Our results are in accordance with those of Haro et al (2015), Diop et al (2013) and Zhu et al (2015) which showed that biomass production is enhanced by mycorrhizal inoculation. However, these mycorrhizal parameters are not proportional to the number of spores contained in each inoculum.…”

Arbuscular mycorrhiza enhances nutrient accumulation in wheat exposed to elevated CO2 and soil salinity

“…It has been reported that the AM plants had higher dry weight (Tab. ) than the non‐AM plants when exposed to elevated CO 2 or salt stress ( Chandrasekaran et al., ; Zhu et al, ). AM‐enhanced plant growth was related to the increased photosynthetic rate and accumulation of photosynthates in the host plant ( Ingle et al, ).…”

“…Plant nutrient uptake is closely related to the plant C assimilation ( Zhu et al, ). In this study, plant dry weight correlated linearly with N, K, Ca, and Mg accumulation (Figs.…”

“…), which is consistent with the results of Zhu et al (). An extra increase in C accumulation and growth of the AM plants was observed in relation to N uptake, indicating an N dilution effect ( Zhu et al, ).…”

“…It is well documented that AM fungi influence nutrient uptake and translocation when plants are exposed to salinity stress or elevated CO 2 regime ( Evelin et al, ; Zhu et al, ). Under salinity stress, AM plants possessed higher N, K, Ca, and Mg concentrations, but lower Na concentration compared to non‐AM plants ( Zuccarini and Okurowska , ; Evelin et al, ; Chandrasekaran et al, ; Saxena et al, ).…”