Fungos micorrízicos arbusculares quanto mais, melhor? Sim e não para mudas de Handroanthus serratifolius (Vahl) S. O. Grose

Abstract

Studies on the relationship between Handroanthus serratifolius and arbuscular mycorrhizal fungi (AMF) are few in the literature, as well as the influence of AMF spore density on plant development, but fundamental to determine the degree of benefits of this relationship. Therefore, we examined growth and biochemical parameters of H. serratifolius seedlings observed at different AMF spore densities. A randomized experimental design with three spore densities and control was used. The densities were classified as low, medium and high with 1.54, 3.08 and 12.35 spores g ־¹ respectively. Analyzes of plant growth, mycorrhizal colonization, concentration of nitrogen compounds and carbohydrates were carried out. The average spore density provided greater increments of biomass, height, leaf area and root volume. A greater efficiency of the patient's metabolism was observed, since the ammonium and nitrate compounds were more quickly incorporated into the proteins and chlorophyll compounds. As for the dynamics of carbohydrates, the importance of analyzing other groups of carbohydrates in addition to total soluble sugars was observed. These results corroborate the replicability of future studies focused on the symbiosis of the plant and the AMF, suggesting the existence of a density to better verify this relationship.