Analysis of volatile composition of interaction between the pathogen E. necator and two grapevine varieties
Volatile organic compounds (VOCs) are emitted by nearly all plant organs of the plants, including leaves. They play a key role in the communication with other organisms, therefore they are involved in plant defence against phytopathogens. In this study VOCs from grapevine leaves of two varieties of Vitis vinifera infected by Erysiphe necator were analysed. The varieties were selected based on their susceptibility to pathogen, Kishmish Vatkana has the Ren1 resistance gene and Zamarrica showed high susceptibility in previous trials. Three plants per variety were inoculated with a conidial solution (>105 conidias/ml). Leaves were extracted by headspace solid phase microextraction and analysed by GC-MS at 1 day post inoculation. More than 70 compounds were annotated, leaf extracts of Kishmish were richer in compounds than Zamarrica. In respond to pathogen, the accumulation of aldehydes, mainly 2-pentenal, and ethyl esters in Kismish were scored. Zamarrica had a greater number of compounds that modified their concentrations by the interaction. When compared between treated leaves of both varieties, differences in terpenes and aldehydes were found. These results show that VOCs may play an important role in the response to pathogen attack, but further transcriptomic analyses are required to know the possible effects of VOCs on defence system, mainly in the activation of resistance mechanisms.
Acknowledgements: Financial support from Ministerio de Ciencia Innovación y Universidades RTI2018-101085-R-C32.
Issue: ICGWS 2023
1 Instituto de Ciencias de la Vid y el Vino (ICVV), Finca La Grajera, Carretera de Burgos km 6, 26007, Logroño
2 Dpto. de Agricultura y Alimentación, Universidad de La Rioja, C/Madre de Dios 51, 26006, Logroño