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Arbuscular mycorrhizal fungi improve growth and phosphate nutrition of Acacia seyal (Delile) under saline conditions


Manga, AGB and Ndiaye, M and Ndiaye, MAF and Sane, S and Diop, TA and Diatta, AA and Bassene, C and Min, D and Battaglia, M and Harrison, MT, Arbuscular mycorrhizal fungi improve growth and phosphate nutrition of Acacia seyal (Delile) under saline conditions, Soil Systems, 6, (4) Article 79. ISSN 2571-8789 (2022) [Refereed Article]

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2022. The Authors. Licensee MDPI, Basel, Switzerland. This article is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License (, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

DOI: doi:10.3390/soilsystems6040079


Many plant species adapted to semi-arid environments are grown in the Sahelian region in northern Africa. One such species is Acacia seyal (Delile), a multipurpose leguminous tree grown in various agroecological zones, including saline soils. These challenging arid and semi-arid environments harbor a diversity of arbuscular mycorrhizal fungi (AMF) communities that can develop symbiotic associations with plants to improve their hydromineral nutrition. This study compared the effects of native AMF communities isolated from semi-arid sites (high, moderate, and low salinity zones Ndiafate, Ngane, and Bambey, respectively) and the AMF Rhizoglomus aggregatum on the development and phosphate nutrition of A. seyal seedlings subject to three salinity treatments (0, 340, and 680 mM). Plant height, dry matter weight of the shoots and roots, and phosphorus uptake from the soil were measured. Plants inoculated with AMF native species from each site that were provided with up to 340 mM of NaCl had greater shoot height than plants grown under 680 mM salinity. At NaCl concentrations above 340 mM, shoot and root development of A. seyal seedlings diminished. However, dry matter production of shoots (7%) and roots (15%) improved following AMF inoculation compared with the control (respectively 0.020 and 0.07 g for shoots and roots). When inoculated with AMF isolates from the high salinity zone (Ndiafate), phosphate content/nutrition was increased by 10% around 30 days after inoculation compared with non-inoculated seedlings (2.84 mg/kg of substrate). These results demonstrate that native AMF inoculants are capable of helping plants withstand environmental constraints, especially those exposing plants to harsh climatic conditions. We discuss insights on how AMF influences the interplay between soil phosphorus and perceived salinity that may have implications for broader relationships between plants and symbiotic fungi.

Item Details

Item Type:Refereed Article
Keywords:Arbuscular, mycorrhizal, fungi, phosphate, fertilizer, organic, Acacia, wattle, salinity, drought, heatwave, desert, organic carbon, soils, biodiversity, nutrition, growth, physiology, shoots, roots, dry matter, biodiversity, microbiology, carbon
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Ecological physiology
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Soils
UTAS Author:Harrison, MT (Associate Professor Matthew Harrison)
ID Code:153997
Year Published:2022
Deposited By:TIA - Research Institute
Deposited On:2022-10-21
Last Modified:2022-11-18
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