Seasonal Variation in Mycorrhizal Community of Different Cerrado Phytophysiomies

Abstract

Purpose: Understanding the dynamics of mycorrhizal fungi in the Cerrado is fundamental for the adoption of conservation practices and for understanding the resilience of this biome in relation to long periods of drought. Thus, this work aimed to verify the dynamics of the mycorrhizal population in five phytophysiognomies of the Cerrado biome. Methods: The samples were taken from the Chapada dos Veadeiros National Park, a permanent preservation with native Cerrado vegetation without any anthropic influence. The five main phytophysiognomies of the Cerrado biome were chosen: the Campo Limpo, Campo Sujo, Cerrado Strictu Sensu, Cerradão, and Veredas. Rhizospherical soil samples were collected in both the wet and dry seasons. Spore density, mycorrhizal colonization rate, easily extractable glomalin, and associated mycorrhizal fungi genera were identified. Results: The values of spore density, mycorrhizal colonization rate, and glomalin were higher in the samples performed during the dry season compared to the samples performed in the rainy season. The same behavior was observed when comparing the different phytophysionomies. Conclusion: Mycorrhizal activity is higher in dry periods when compared to rainy periods. There is no specificity of genera of arbuscular mycorrhizal fungi within the Cerrado phytophysiognomies.

Short‐term impact of fire on the total soil microbial and nitrifier communities in a wet savanna

“…The total archaeal and bacterial abundances did not change with the vegetation cover and the fire, but the total fungal abundance was higher under trees and grasses than in bare soil and was not impacted by fire. This suggests either a general decrease in wooddecay and litter-decomposing fungi linked to lower organic matter in bare soil patches, and/or a strong rhizospheric effect due to associations between mycorrhizal fungi and tree/grass roots (Vieira Junior et al, 2020;. However, no data are so far available on the abundance of mycorrhizae in Lamto savanna to confirm this hypothesis.…”

Arbuscular mycorrhizal fungi in the soil using cover crops with and without nitrogen addition

“…The Cerrado is a region that has two well-defined climatic seasons, the dry season and the rainy season (Cardoso et al, 2015). The behavior of mycorrhizal fungi in Cerrado soils is closely linked to this seasonal variation (Vieira Junior et al, 2020). During the dry period, the mycorrhizal colonization rate is benefited from the need to support the water supply that fungi provide to plants, which in turn also promotes greater spore production by mycorrhizal fungi (Moura and Cabral, 2019).…”

Arbuscular Mycorrhizal Fungi in the Cerrado Biome: Effects of Land Use System, Soil Texture, and Seasonality

“…Determining an isolate factor that is affecting the sporulation and diversity of species is difficult, since AMF present seasonal dynamics, with higher activity in some periods of year (VIEIRA JÚNIOR et al, 2020), and can be dependent on the soil plant cover type, vegetation management, and carbon supply level ( VAN DER HEYDE et al, 2017a).…”