Effect of physical, chemical and environmental characteristics on arbuscular mycorrhizal fungi in Brachiaria decumbens (Stapf) pastures

Abstract

Aim: To evaluate the effects of soil physical and chemical factors (pH, conductivity, humidity, available phosphorus and organic matter) and environmental factors (temperature, relative air humidity, altitude and atmospheric pressure) on arbuscular mycorrhizal fungi (AMF)–Brachiaria decumbens grass relationship. Furthermore to establish patterns of microbiological responses that allow to differentiate the study sites in two relief types. Methods and Results: Mycorrhizal characteristics (spore density, external hyphae and root colonizations by hyphae, vesicles and arbuscules), physical and chemical factors in soil and environmental factors were measured. Conclusions: The effect of physical, chemical and environmental factors on microbiological variables was related to the type of relief ‘valley and hilly terrain’; the AMF behaviour was affected only over narrower ranges of evaluated variables. Similarly, the colonization of B. decumbens roots by AMF hyphae, vesicles and the mycorrhizal spore density follow different patterns according to the relief type. Significance and Impact of the Study: The type of relief is one of the factors to be taken into consideration to evaluate the AMF inoculum and root colonization of these pastures, because of the influence of slope – as physical property of soil – on AMF.

Colonization with arbuscular mycorrhizal fungus affects growth, drought tolerance and expression of stress-responsive genes in Poncirus trifoliata

“…During the AM development, characteristic and typical structures, such as hyphae, vesicles and arbuscules, could be detected in the roots based on the microscopic observation, and the timing frame was similar to the earlier reports (Posada et al 2008;Bolandnazar 2009). These data indicate that trifoliate orange and G. mosseae establish host-pathogen relationship.…”

Optimization of the production of mycorrhizal inoculum on substrate with organic fertilizer

“…The greatest spore production was observed in substrates with 10% vermicompost. Possibly, the value of P affected the outcome since this nutrient plays an important role in the regulation of production of AMF propagules ( Posada et al , 2008 ). However, Douds Jr (1994) observed that the addition of P to the solution used to irrigate diminished the production of spores.…”

Effect of digested slurry on the dry matter production and arbuscular mycorrhizal colonization of two genotypes of Zoysia grass

“…in both zoysia grass genotypes, which have been associated with decreased soil pH and increased EC (Posada et al 2008;Han et al 2014;Wang et al 2015).…”

“…Relationships among the DMY of zoysia grass, arbuscular mycorrhiza colonization and soil chemical properties Continuous fertilizer application would lead to change in soil properties (Posada et al 2008;Han et al 2014;Wang et al 2015). In the current experiment, continuous application resulted in a decrease in soil pH and an increase in EC.…”