Management of the mycorrhizal soil infectivity with Crotalaria ochroleuca, an indigenous wild legume in the tropics: Impacts on microbial functional diversity involved in phosphorus mobilizationprocesses in a sahelian soil

Management of the mycorrhizal soil infectivity with Crotalaria ochroleuca, an indigenous wild legume in the tropics: Impacts on microbial functional diversity involved in phosphorus mobilizationprocesses in a sahelian soil Benkhoua N. auteur aut IRD Hafidi M. auteur aut IRD Badri W. auteur aut IRD Baudoin Ezékiel auteur aut IRD Thioulouse J. auteur aut IRD Prin Y. auteur aut IRD Galiana A. auteur aut IRD Ouahmane L. auteur aut IRD Ouhammou A. auteur aut IRD Sanguin H. auteur aut IRD Duponnois Robin auteur aut IRD text journalArticle eng text/pdf born digital access It is well known that the over exploitation of soil resources decreases the density and diversity of arbuscular mycorrhizal (AM) fungal propagules. It has been postulated that agricultural practices could promote the occurrence and functioning of remaining and resilient AM fungal ecotypes in order to benefit from AM associations. Using C. ochroleuca, a highly mycotrophic plant species, the aims of this study were to determine in controlled conditions, the impact of this legume species on: (i) the mycorrhizal soil infectivity (MSI), (ii) the Rock Phosphate (RP) solubilising activity and (iii) the soil microbial functions. The expected benefits of C. ochroleuca cultivation have been evaluated by comparing its biological influences with those recorded with a non-mycorrhizal plant species, Brassica oleracea in order to attest of the importance of the AM potential in RP weathering and soil functioning. The results show that: C. ochroleuca was effective in improving the mycorrhizal soil potential, (ii) functional abilities of soil microflora were influenced by the cultured plant species and the mycorrhizal soil potential and (iii) the efficiency of rock phosphate amendment on plant growth depended on the level of mycorrhizal soil potential and was linkedto the extent of the mycorrhizal network.The C. ochroleuca impact was significantly reinforced with KRP amendment (i.e. +29.3% for the Catabolic Eveness, +45.7% for the hyphal length). According to these results, it could be concluded that agricultural strategies based on the management of local biodiversity (i.e. the use of native legume species) could be considered as a sustainable practice to optimally manage AM fungi and to ensure their functionalities in order to maintain a sustainable production of food crops in the tropics. specialized Arbuscularmycorrhizal fungi Mycorrhizal soil infectivity Rock phosphate BURKINA FASO ZONE SAHELIENNE 084 Ecological Engineering 101 130-136 2017 0925-8574 https://www.documentation.ird.fr/hor/fdi:010069488 10.1016/j.ecoleng.2017.01.010 0925-8574 [F B010069488] https://www.documentation.ird.fr/hor/fdi:010069488 https://www.documentation.ird.fr/intranet/publi/2017/05/010069488.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2017-06-01 2018-01-02 fdi:010069488 fre