EVALUATION OF SEEDLING RESISTANCE IN CUCURBITA ROOTSTOCKS AND CUCUMBER SCIONS TO PHYTOPHTHORA DRECHSLERI UNDER GREENHOUSE CONDITIONS

A. Farhadi, S. Jalali, M. Nematolahi
Phytophthora blight caused by Phytophthora drechsleri is a serious threat to vegetable production worldwide. The use of grafting onto suitable rootstocks could provide host resistance to soil-borne pathogens and may offer other advantages such as enhanced commercial fruit yield and quality. This study was conducted at the Agricultural and Natural Resources Research Center of Isfahan during 2006-2007 in order to find out the reaction of 9 rootstock and 2 scions to P. drechsleri. Rootstocks included Cucurbita pepo (small and long seed), C. moschata ‘Halvaii’, C. maxima ‘Tanbal’, ES-101, RS-841, ES-152, ES-107 and RS-426. The cultivars used as scion were Cucumis sativus ‘Bosco’ and ‘Dastgerdi’. The 11 treatments were scored to be sensitive, tolerant or resistant to the pathogen in greenhouse assays. Media in pots was artificially inoculated using three isolates of P. drechsleri and by placing two disc of PDA, with mycelium of the pathogen near the crown of the plants. Native cucumber ‘Dastgerdi’, hybrid ‘Bosco’ cucumber, C. pepo (small and long seed) and C. moschata ‘Halvaii’ were found to be extremely sensitive. Rootstocks of RS-426 and ES-101 were tolerant and rootstocks of RS-841, ES-152, ES-107 and C. maxima ‘Tanbal’ were resistant to P. drechsleri. Thus grafting commercial cucumber onto various resistant Cucurbita rootstocks could offer a source of host resistance to manage this important pathogen.
Farhadi, A., Jalali, S. and Nematolahi, M. (2015). EVALUATION OF SEEDLING RESISTANCE IN CUCURBITA ROOTSTOCKS AND CUCUMBER SCIONS TO PHYTOPHTHORA DRECHSLERI UNDER GREENHOUSE CONDITIONS. Acta Hortic. 1086, 129-132
DOI: 10.17660/ActaHortic.2015.1086.15
https://doi.org/10.17660/ActaHortic.2015.1086.15
cucumber, rootstock, resistant, Phytophthora, scion
English

Acta Horticulturae