Bencherif Karima, Laruelle Frédéric, Dalpé Yolande, Lounès-Hadj Sahraoui Anissa
Départements des Sciences Agrovétérinaires, Faculté des Sciences de la Nature et de la Vie, Université de Djelfa, Route de Moudjbara, Boite Postale 3117, Djelfa 17000, Algeria.
Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV), Université du Littoral Côte d'Opale, UR 4492, SFR Condorcet FR CNRS 3417, 50 rue Ferdinand Buisson, CEDEX, 62228 Calais, France.
Plants (Basel). 2021 Dec 10;10(12):2716. doi: 10.3390/plants10122716.
(1) Background: Soil degradation is an increasingly important problem in many parts of the world, particularly in arid and semiarid areas. Arbuscular mycorrhizal fungi (AMF) isolated from arid soils are recognized to be better adapted to these edaphoclimatic conditions than exogenous ones. Nevertheless, little is known about the importance of AMF inoculum sources on development in natural saline soils. Therefore, the current study aims at investigating the efficiency of two AMF-mixed inoculums on growth, with consideration of its rhizosphere microbiota. (2) Methods: indigenous inoculum made of strains originating from saline soils and a commercial one were used to inoculate in four saline soils with different salinity levels under microcosm conditions with evaluation of rhizosphere microbial biomasses. (3) Results: Our findings showed that indigenous inoculum outperforms the commercial one by 80% for the mycorrhizal rate and 40% for plant biomasses, which are correlated with increasing shoot phosphorus content. Soil microbial biomasses increased significantly with indigenous mycorrhizal inoculum in the most saline soil with 46% for AMF, 25% for saprotrophic fungi and 15% for bacterial biomasses. (4) Conclusion: Present results open the way towards the preferential use of mycorrhizal inoculum, based on native AMF, to perform revegetation and to restore the saline soil microbiota.
(1) 背景：土壤退化在世界许多地区，尤其是干旱和半干旱地区，正成为一个日益重要的问题。从干旱土壤中分离出的丛枝菌根真菌（AMF）被认为比外源真菌更能适应这些土壤气候条件。然而，关于AMF接种源对天然盐渍土发育的重要性知之甚少。因此，本研究旨在研究两种AMF混合接种剂对植物生长的效率，并考虑其根际微生物群。(2) 方法：用源自盐渍土的菌株制成的本地接种剂和一种商业接种剂，在微观条件下对四种不同盐度水平的盐渍土中的植物进行接种，并评估根际微生物生物量。(3) 结果：我们的研究结果表明，本地接种剂在菌根率方面比商业接种剂高出80%，在植物生物量方面高出40%，这与地上部磷含量的增加相关。在盐分最高的土壤中，使用本地菌根接种剂后，土壤微生物生物量显著增加，其中AMF增加了46%，腐生真菌增加了25%，细菌生物量增加了15%。(4) 结论：目前的研究结果为优先使用基于本地AMF的菌根接种剂进行植被恢复和恢复盐渍土微生物群开辟了道路。
