Discrimination of onion subjected to drought and normal watering mode based on fluorescence spectroscopic data

•The fluorescence spectroscopic data proved to be useful for the discrimination of onion samples.•Samples growing under drought and normal watering were discriminated with an accuracy reaching 100%.•Different onion varieties and lines were correctly distinguished in 90% for samples subjected to drought.•The accuracy reached 84% for discrimination of varieties and lines growing under normal watering.