title: Arbuscular mycorrhizal growth responses are fungal specific but do not differ between soybean genotypes with different phosphate efficiency.
abstract: 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.
  
  
  
  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.
  
  
  
  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.
  
  
  
  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.
authors.affiliation: Root Biology Center, College of Agriculture, South China Agricultural University, Guangzhou 510642, China South Dakota State University, Biology and Microbiology Department, Brookings, SD 57007, USA.
authors.forename: Xiurong
authors.initials: X
authors.lastname: Wang
authors.affiliation: Root Biology Center, College of Agriculture, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Shaopeng
authors.initials: S
authors.lastname: Zhao
authors.affiliation: South Dakota State University, Biology and Microbiology Department, Brookings, SD 57007, USA heike.bucking@sdstate.edu.
authors.forename: Heike
authors.initials: H
authors.lastname: Bücking
mesh_terms: D001692:Biological Transport; D018533:Biomass; D018506:Gene Expression Regulation, Plant; D005838:Genotype; D055137:Glomeromycota / Q000254:growth & development / Q000502:physiology; D038821:Mycorrhizae / Q000254:growth & development / Q000502:physiology*; D028061:Phosphate Transport Proteins / Q000235:genetics / Q000378:metabolism; D010710:Phosphates / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism; D013025:Glycine max / Q000235:genetics / Q000378:metabolism / Q000382:microbiology*; D013559:Symbiosis / Q000235:genetics
chemical_list: D028061:Phosphate Transport Proteins; D010710:Phosphates; D010758:Phosphorus
keywords: Arbuscular mycorrhizal symbiosis; Glomus aggregatum; Glomus custos; Glycine max; Rhizophagus irregularis; gene expression; mycorrhizal growth response; mycorrhizal uptake pathway; phosphate acquisition efficiency; phosphate transporter