Mycorrhization Stimulant in Soybean Associated With Phosphate Fertilization in Oxisols

Abstract

The use of stimulants in the establishment of arbuscular mycorrhizal fungi has great potential in contributing to P uptake by plants. This study aimed to evaluate the effect of isoflavonoid formononetin as mycorrhization stimulant on soybean associated with phosphate fertilizer in Oxisols with intermediate (OPi) and low (OPl) phosphorus availability, in the Cerrado region of Piauí. The experiment in each soil consisted of randomized blocks design in a 4×4 factorial scheme, with four replications. The treatments comprised of four phosphorus doses (0, 26.66, 40 and 80 kg ha-1 P2O5), and four isoflavonoid formononetin doses (0, 0.5, 0.9 and 1.8 g kg-1 soybean seeds). The variables evaluated were soybean growth, yield, nodulation and mycorrhizal colonization rate. With the exception of mycorrhizal colonization rate in OPi, plant height and number of pods per plant in OPl, the other variables were not affected by the application of isoflavonoid formononetin, in both soils. Yield linearly increased with increase in the phosphorus doses in OPl, and presented agronomic efficiency of ~15 kg ha-1 grain for each kg ha-1 P2O5 applied to the soil.

Spore reproduction, glomalin content, and maize growth on mycorrhizal pot culture using acid mineral soil-based media

“…On all media compositions, mycorrhizal inoculation treatments of I1, I2, and I3 resulted in higher chlorophyll content and P concentration in shoot tissues compared with the treatments without mycorrhizal inoculation (I0). This result is consistent with the report of Andrade et al (2018) that the mycorrhizal inoculation increased P concentration and P uptake of soybean on Oxisols. Gheisari Zardak et al (2017) found that the application of AM increased the accumulation of P in plant tissues and simultaneously stimulated plant growth.…”

Organic substrates and formononetin for Leucaena leucocephala saplings

“…In the seedling phase this can be of key importance in decreasing the time spent developing the nursery. Consequently, the use of stimulants to establish the of mycorrhizal fungi colonization of root systems has great potential in agriculture (ANDRADE et al, 2018). The use of formononetine, has been shown to stimulate mycorrhization of native species roots, facilitating colonization by mycorrhizal fungi.…”

“…Além da adequada composição do substrato para a produção de mudas de qualidade, as plantas que se beneficiam da simbiose com fungos micorrízicos podem, também, apresentar maiores incrementos na massa seca de raízes e parte aérea (SILVA et al, 2017), o que pode ser fundamental em fase de muda para diminuir o tempo de permanência no viveiro. O uso de estimulantes para estabelecer a colonização de fungos micorrízicos em raízes tem grande potencial na agricultura (ANDRADE et al, 2018). O uso da formononetina, como estimulante de micorrização nas culturas, tem demonstrado capacidade de estimular a colonização com espécies nativas de fungos micorrízicos.…”

Espécies de acaulospora ssp. E sua eficácia na produção de milho adubado com fontes de fósforo

“…Muitas micorrizas são estimuladas pela presença de compostos isoflavonóides formonetina, potencializando a fixação de fósforo para as plantas de soja, sendo reconhecido acréscimos de produtividade e eficiência agronômica de 15 kg ha -1 de grãos para cada kg há de fósforo aplicado no solo (ANDRADE et al, 2018).…”