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Arbuscular mycorrhizal growth responses are fungal specific but do not differ between soybean genotypes with different phosphate efficiency

TitleArbuscular mycorrhizal growth responses are fungal specific but do not differ between soybean genotypes with different phosphate efficiency
Publication TypeJournal Article
Year of Publication2016
AuthorsWang X, Zhao S, Bucking H
JournalAnnals of Botany
Volume118
Issue1
Pagination11-21
Date PublishedJul
ISBN Number0305-7364
Accession NumberWOS:000381228800002
Abstract

Background and Aims Arbuscular mycorrhizal (AM) fungi play a key role in the phosphate ( P) uptake of many important crop species, but the mechanisms that control their efficiency and their contribution to the P nutrition of the host plant are only poorly understood. Methods The P uptake and growth potential of two soybean genotypes that differ in their root architectural traits and P acquisition efficiency were studied after colonization with different AM fungi and the transcript levels of plant P transporters involved in the plant or mycorrhizal P uptake pathway were examined. Key Results The mycorrhizal growth responses of both soybean genotypes ranged from highly beneficial to detrimental, and were dependent on the P supply conditions, and the fungal species involved. Only the colonization with Rhizophagus irregularis increased the growth and P uptake of both soybean genotypes. The expression of GmPT4 was downregulated, while the mycorrhiza-inducible P transporter GmPT10 was upregulated by colonization with R. irregularis. Colonization with both fungi also led to higher transcript levels of the mycorrhiza-inducible P transporter GmPT9, but only in plants colonized with R. irregularis were the higher transcript levels correlated to a better P supply. Conclusions The results suggest that AM fungi can also significantly contribute to the P uptake and growth potential of genotypes with a higher P acquisition efficiency, but that mycorrhizal P benefits depend strongly on the P supply conditions and the fungal species involved.

Short TitleArbuscular mycorrhizal growth responses are fungal specific but do not differ between soybean genotypes with different phosphate efficiency