title: Root colonisation by the arbuscular mycorrhizal fungus Glomus intraradices alters the quality of strawberry fruits (Fragaria x ananassa Duch.) at different nitrogen levels.
abstract: BACKGROUND
  Arbuscular mycorrhizal fungi (AMF) increase the uptake of minerals from the soil, thus improving the growth of the host plant. Nitrogen (N) is a main mineral element for plant growth, as it is an essential component of numerous plant compounds affecting fruit quality. The availability of N to plants also affects the AMF-plant interaction, which suggests that the quality of fruits could be affected by both factors. The objective of this study was to evaluate the influence of three N treatments (3, 6 and 18 mmol L(-1)) in combination with inoculation with the AMF Glomus intraradices on the quality of strawberry fruits. The effects of each factor and their interaction were analysed.
  
  
  RESULTS
  Nitrogen treatment significantly modified the concentrations of minerals and some phenolic compounds, while mycorrhization significantly affected some colour parameters and the concentrations of most phenolic compounds. Significant differences between fruits of mycorrhizal and non-mycorrhizal plants were found for the majority of phenolic compounds and for some minerals in plants treated with 6 mmol L(-1) N. The respective values of fruits of mycorrhizal plants were higher.
  
  
  CONCLUSIONS
  Nitrogen application modified the effect of mycorrhization on strawberry fruit quality.
authors.affiliation: Instituto de Investigaciones Agropecuarias y Forestales, Universidad Michoacana de San Nicolás de Hidalgo, Km 9.5, Carretera Morelia-Zinapécuaro, CP 58880, Tarímbaro, Michoacán, Mexico. vilma_c_99@yahoo.com
authors.forename: Vilma
authors.initials: V
authors.lastname: Castellanos-Morales
authors.forename: Javier
authors.initials: J
authors.lastname: Villegas
authors.forename: Silvia
authors.initials: S
authors.lastname: Wendelin
authors.forename: Horst
authors.initials: H
authors.lastname: Vierheilig
authors.forename: Reinhard
authors.initials: R
authors.lastname: Eder
authors.forename: Raúl
authors.initials: R
authors.lastname: Cárdenas-Navarro
mesh_terms: D003116:Color; D031985:Fragaria / Q000737:chemistry / Q000378:metabolism*; D005638:Fruit / Q000737:chemistry / Q000378:metabolism / Q000592:standards*; D055137:Glomeromycota; D008903:Minerals / Q000378:metabolism; D038821:Mycorrhizae / Q000502:physiology*; D009584:Nitrogen / Q000378:metabolism*; D010636:Phenols / Q000032:analysis*; D018517:Plant Roots; D014131:Trace Elements / Q000378:metabolism*
chemical_list: D008903:Minerals; D010636:Phenols; D014131:Trace Elements; D009584:Nitrogen