Changes in Land Use System and Environmental Factors Affect Arbuscular Mycorrhizal Fungal Density and Diversity, and Enzyme Activities in Rhizospheric Soils of Acacia senegal (L.) Willd.

The responses of the soil microbial community features associated to the legume tree Acacia senegal (L.) Willd. including both arbuscular mycorrhizal fungal (AMF) diversity and soil bacterial functions, were investigated under contrasting environmental conditions. Soil samples were collected during dry and rainy seasons in two contrasting rainfall sites of Senegal (Dahra and Goudiry, in arid and semiarid zone, resp.). Soils were taken from the rhizosphere of A. senegal both in plantation and natural stands in comparison to bulk soil. A multiple analysis revealed positive correlations between soil physicochemical properties, mycorrhizal potential and enzyme activities variables. The positive effects of A. senegal trees on soil mycorrhizal potential and enzyme activities indicates that in sahelian regions, AMF spore density and diversity as well as soil microbial functions can be influenced by land-use systems (plantation versus natural population of A. senegal) and environmental conditions such as moisture and soil nutrient contents. Our study underlines the importance of prior natural AMF screening for better combinations of A. senegal seedlings with AMF species to achieve optimum plant growth improvement, and for restoration and reforestation of degraded lands.

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Arbuscular mycorrhizal fungal (AMF) communities and land use change: the conversion of temperate forests to avocado plantations and maize fields in central Mexico

Fungal Ecology ◽

10.1016/j.funeco.2011.09.002 ◽

2012 ◽

Vol 5 (1) ◽

pp. 16-23 ◽

Cited By ~ 25

Author(s):

J.C. González-Cortés ◽

M. Vega-Fraga ◽

L. Varela-Fregoso ◽

M. Martínez-Trujillo ◽

Y. Carreón-Abud ◽

...

Keyword(s):

Land Use ◽

Land Use Change ◽

Temperate Forests ◽

Arbuscular Mycorrhizal ◽

Central Mexico ◽

Amf Communities ◽

Arbuscular Mycorrhizal Fungal

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Root colonization of bait plants by indigenous arbuscular mycorrhizal fungal communities is not a suitable indicator of agricultural land-use legacy

Agriculture Ecosystems & Environment ◽

10.1016/j.agee.2016.07.013 ◽

2016 ◽

Vol 231 ◽

pp. 310-319 ◽

Cited By ~ 4

Author(s):

Jan Jansa ◽

Veronika Řezáčová ◽

Petr Šmilauer ◽

Hans-Rudolf Oberholzer ◽

Simon Egli

Keyword(s):

Land Use ◽

Root Colonization ◽

Agricultural Land ◽

Arbuscular Mycorrhizal ◽

Fungal Communities ◽

Agricultural Land Use ◽

Bait Plants ◽

Arbuscular Mycorrhizal Fungal

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The Phosphate Inhibition Paradigm: Host and Fungal Genotypes Determine Arbuscular Mycorrhizal Fungal Colonization and Responsiveness to Inoculation in Cassava With Increasing Phosphorus Supply

Frontiers in Plant Science ◽

10.3389/fpls.2021.693037 ◽

2021 ◽

Vol 12 ◽

Author(s):

Ricardo Alexander Peña Venegas ◽

Soon-Jae Lee ◽

Moses Thuita ◽

Deusdedit Peter Mlay ◽

Cargele Masso ◽

...

Keyword(s):

Mycorrhizal Fungi ◽

Arbuscular Mycorrhizal ◽

Field Trials ◽

P Uptake ◽

Fungal Colonization ◽

P Availability ◽

Terrestrial Plants ◽

Soil Microbial ◽

Arbuscular Mycorrhizal Fungal ◽

P Supply

A vast majority of terrestrial plants are dependent on arbuscular mycorrhizal fungi (AMF) for their nutrient acquisition. AMF act as an extension of the root system helping phosphate uptake. In agriculture, harnessing the symbiosis can potentially increase plant growth. Application of the AMF Rhizophagus irregularis has been demonstrated to increase the yields of various crops. However, there is a paradigm that AMF colonization of roots, as well as the plant benefits afforded by inoculation with AMF, decreases with increasing phosphorus (P) supply in the soil. The paradigm suggests that when fertilized with sufficient P, inoculation of crops would not be beneficial. However, the majority of experiments demonstrating the paradigm were conducted in sterile conditions without a background AMF or soil microbial community. Interestingly, intraspecific variation in R. irregularis can greatly alter the yield of cassava even at a full application of the recommended P dose. Cassava is a globally important crop, feeding 800 million people worldwide, and a crop that is highly dependent on AMF for P uptake. In this study, field trials were conducted at three locations in Kenya and Tanzania using different AMF and cassava varieties under different P fertilization levels to test if the paradigm occurs in tropical field conditions. We found that AMF colonization and inoculation responsiveness of cassava does not always decrease with an increased P supply as expected by the paradigm. The obtained results demonstrate that maximizing the inoculation responsiveness of cassava is not necessarily only in conditions of low P availability, but that this is dependent on cassava and fungal genotypes. Thus, the modeling of plant symbiosis with AMF under different P levels in nature should be considered with caution.

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