Reaction of passion fruit species to Rotylenchulus reniformis and Meloidogyne incognita

Abstract

Passion fruit (Passiflora spp.) yield is limited by several factors, including soil pathogens, such as Rotylenchulus reniformis (the reniform nematode) and Meloidogyne incognita (the Southern root-knot nematode). Understanding the behavior of different cultivars, within different species of passion fruit could be important asset to the search for sources of resistance, and therefore for the effective management of phytonematodes. Three trials were carried out in greenhouse to evaluate the resistance/susceptibility of different passion fruit species to R. reniformis and M. incognita. For R. reniformis, cultivars from two species were tested: Passiflora edulis f. flavicarpa (‘BRS Sol do Cerrado’, ‘BRS Rubi do Cerrado’ and ‘BRS Gigante Amarelo’) and Passiflora cincinnata (‘BRS Sertão Forte’). Regarding M. incognita, all the cultivars above were evaluated, with the addition of Passiflora setacea (‘BRS Pérola do Cerrado’). The results showed that all tested cultivars were susceptible to the reniform nematode. Conversely, all tested cultivars were immune to root-knot nematode, although exhibiting root galling. Therefore, it is emphasizes the relevance of reniform nematode to passion fruit crops.

Understanding the interaction between >i<Meloidogyne incognita>/i< and >i<Fusarium oxysporum>/i< f. sp. >i<passiflorae>/i< in grafted passion fruit seedlings

“…The Southern root-knot nematode does not hold the status of a pathogen of relevance for the sour passion fruit plant (Silva & Inomoto, 2022); thus, it would not pose a concern for sour passion fruit plants grown under ungrafted conditions. However, the presence of this nematode would become a problematic issue for sour passion fruit plants grafted onto BPF, given that M. incognita is highly pathogenic to BPF, inducing root galls and inhibiting shoot growth.…”