Abstract
The Cerrado is one of the most important regions for agricultural development in the world and is the main productive breadbasket of the Americas. One of the main agricultural activities in the region is high-tech livestock. Cerrado soils are predominantly low in fertility, and arbuscular mycorrhizal fungi play a fundamental role in plant nutrition in this biome. Understanding the behavior of mycorrhizal fungi in the soil under pasture is essential for the development of more efficient and sustainable management practices. Thus, this work aims to verify the activity of arbuscular mycorrhizal fungi in different species of forage grasses cultivated in cerrado soil. To measure mycorrhizal activity, soil spore density factors and mycorrhizal colonization rates in roots of 14 forage grass genotypes were investigated. No significant differences were identified in spore density values between the investigated genotypes. Panicum maximum cv and Mombasa showed the lowest values of mycorrhizal colonization, and the highest values were found in the roots of Brachiaria decumbens. Among the identified genera associated with the rhizosphere of the genotypes studied, Gigaspora, Scutelospora and Sclerocysts are less frequent, which indicates that the association with these fungal genera is less recurrent than with the others.
Highlights
The Cerrado is one of the most important regions for agricultural development in the world and is the main productive breadbasket of the Americas
From a natural history perspective, the Cerrado could be considered a biogeographic region that is more than 40 million years old[6,7,8,9]
Due to its privileged location, the Cerrado stands out as one of the most important agricultural frontiers in the world[3,4], with much of the area today consisting of largescale industrial agriculture and degraded pastures[10,11]
Summary
This work aims to verify the activity of arbuscular mycorrhizal fungi in different species of forage grasses cultivated in cerrado soil. The Cerrado is the second largest Brazilian biome, extending over an area of 2,045,064 k m2 and spanning eight states of Central Brazil: Minas Gerais, Goiás, Tocantins, Bahia, Maranhão, Mato Grosso, Mato Grosso do Sul, Piauí and Distrito Federal[1]. It is divided by three of the largest hydrographic basins in South America, with regular rainfall indices that provide great biodiversity. For conditions in the Cerrado, vegetation cover must have a low carbon–nitrogen ratio, which decreases the decomposition speed and increases the time in which the cover protects the soil from erosive p
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