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The role of mycorrhizal symbiosis in aluminum and phosphorus interactions in relation to aluminum tolerance in soybean

TitleThe role of mycorrhizal symbiosis in aluminum and phosphorus interactions in relation to aluminum tolerance in soybean
Publication TypeJournal Article
Year of Publication2015
AuthorsZhang S, Zhou J, Wang G, Wang X, Liao H
JournalApplied Microbiology and Biotechnology
Volume99
Issue23
Pagination10225-10235
Date PublishedDec
ISBN Number0175-7598
Accession NumberWOS:000365171600030
Abstract

Arbuscular mycorrhizal (AM) fungi protect plants against aluminum (Al) toxicity, but the mechanisms of Al and phosphorus (P) interactions in relation to Al tolerance in mycorrhizal plants are only poorly understood. In this study, varying Al and P treatments were applied to soybean plants cultivated in the presence or absence of three different AM fungi. The results showed that plants in symbiotic association with Gigaspora margarita displayed higher Al tolerance than Rhizophagus irregularis or Glomus claroideum. The effectiveness of G. margarita appeared to be associated with more abundant arbuscules and less affected intraradical hyphae compared to no Al controls. The highest levels of Al toxicity mitigation were observed with the combination of high P availability and AM fungal inoculation, which was associated with a concomitant increase in the expression of the AM-inducible phosphate (Pi) transporter gene GmPT9 in soybean. Taken together, these results suggest that AM symbiosis can alleviate Al toxicity in soybean through enhanced P nutrition, as well as, the alteration of the abundance of mycorrhizal infection structures. These findings highlight the importance of P nutrition status in ameliorating Al toxicity in mycorrhizal plants.

Short TitleThe role of mycorrhizal symbiosis in aluminum and phosphorus interactions in relation to aluminum tolerance in soybean