Volatilome in grapevine leaves is defined by the variety and modulated by mycorrhizal symbiosis
Volatile organic compounds (VOCs) constitute a diverse group of secondary metabolites key for the communication of plants with other organisms and for their adaptation to environmental and biotic stresses. The emission of these compounds through leaves is also affected by the interaction of plants with symbiotic microorganisms, arbuscular mycorrhizal fungi (AMF) among them . Our objective was to know the concentration and profile of VOCs emitted by the leaves of two grapevine varieties (Tempranillo, T, and Cabernet Sauvignon, CS, grafted onto R110 rootstocks), inoculated or not with a consortium of five AMF (Rhizophagus irregularis, Funneliformis mosseae, Septoglomus deserticola, Claroideoglomus claroideum and C. etunicatum). A total of 43 different VOCs were detected in both varieties by gas chromatography coupled to mass spectrometry (SPME GC-MS). The quantitative analyses revealed that leaves of CS had higher concentration of VOCs than those of T, the effect of the mycorrhizal symbiosis on the total levels of VOCs being non-significant. The predominant VOCs were those synthetized by the LOX/HPL pathway, followed by those coming from MVA/MEP pathway and, in a lesser extent, from SK pathway. Pentyl leaf volatiles (PLV), green leaf volatiles (GLV) and VOCs involved in the resistance of grapevine against Plasmopara viticola were more abundant in CS than in T, especially when plants were associated with AMF. The volatilome profiles obtained revealed that some minor VOCs were only present in one of the two tested grapevine varieties. Mycorrhizal association increased the relative abundance (%) of VOCs derived from the SK pathway in T and that of GLV in CS.
Acknowledgements: To A. Urdiain, M. Oyarzun & H. Santesteban for technical support, Asociación de Amigos (UNAV) for D. Kozikova’s scholarship, Bioera SL for AMF, Ministerio de Ciencia e Innovación (Gobierno España) funded the research (Ref. PID2020-118337RB-IOO)
1) Velásquez A. et al. (2020) The arbuscular mycorrhizal fungus Funneliformis mosseae induces changes and increases the concentration of volatile organic compounds in Vitis vinifera cv. Sangiovese leaf tissue. Plant Physiol. Biochem. 155: 437-443, DOI 10.1016/j.plaphy.2020.06.048
Issue: ICGWS 2023
1Environmental Biology department- Group of Stress Physiology in Plants. School of Sciences-BIOMA, University of Navarra. Irunlarrea 1, 31008-Pamplona, Spain
Contact the author*
Cabernet Sauvignon, leaves, mycorrhizal symbiosis, Tempranillo, volatile organic compounds