期刊
ANNALS OF BOTANY
卷 118, 期 1, 页码 11-21出版社
OXFORD UNIV PRESS
DOI: 10.1093/aob/mcw074
关键词
Arbuscular mycorrhizal symbiosis; Glycine max; Glomus aggregatum; Glomus custos; mycorrhizal growth response; mycorrhizal uptake pathway; gene expression; phosphate acquisition efficiency; phosphate transporter; Rhizophagus irregularis
资金
- China Scholarship Council (CSC) [201208440278]
- National Science Foundation (IOS award) [1051397]
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.
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