Relationship between Arbuscular Mycorrhizal Association and Edaphic Variables in Mangroves of the Coast of Yucatán, Mexico
2020
Ramírez-Viga, Thai | Guadarrama, Patricia | Castillo-Argüero, Silvia | Estrada Medina, Héctor | García-Sánchez, Rosalva | Hernández-Cuevas, Laura | Sánchez-Gallén, Irene | Ramos-Zapata, José
Arbuscular mycorrhizal fungi (AMF) are present in a great variety of ecosystems, including wetlands. However, little is known regarding the environmental factors that affect their abundance, diversity and development within the rhizosphere of their hosts in flooded soils. This study had the objective of describing the edaphic environment and the mycorrhizal status of two mangrove species: Avicennia germinans (L.) L. and Conocarpus erectus L., and to identify the edaphic variables that determine the percentage of mycorrhizal colonization, spore density and AMF species richness on their rhizospheres. To accomplish this, roots and rhizospheric soil of A. germinans and C. erectus were collected on the coastal lagoon “La Carbonera”, Yucatán, Mexico. Soil analyses were conducted, the percentage of root fungal colonization was determined and the spores isolated, identified and quantified. Structural equation models were elaborated for each mangrove species to determine the relationship between the edaphic environment and the arbuscular mycorrhizal association. The rhizospheres of the mangroves differ physico-chemically and, while mycorrhizal colonization occurs in both species and spores are present in their rhizospheres, the results indicate higher values in C. erectus compared to A. germinans. Substrate water content and pH are the edaphic variables that determine the AMF variation in the analyzed mangrove rhizospheres.
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