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Grafting okra onto hibiscus genotypes would be an efficient strategy of coexistence with root-knot nematodes

Grant number: 18/15966-1
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): October 01, 2018
Effective date (End): June 30, 2019
Field of knowledge:Agronomical Sciences - Agronomy
Principal Investigator:Leila Trevisan Braz
Grantee:Rafaela Guio Ferreira
Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

The root-knot nematodes (Meloidogyne spp.) constitute the main phytosanitary challenge of okra cropping. The management of these phytoparasites is complex, and, whenever available, the use of genetic resistance as a control in encouraged. However, there are no reports of genetic resistance in okra or even within the genus Abelmoschus. Intergeneric grafting has been approached as an alternative management for this pathosystem. Some studies indicate the use of Hibiscus species as potential rootstocks, as they are resistant to the main root-knot nematodes species and compatible for grafting with okra. However, the information whether grafting onto Hibiscus would be able to maintain the production level in the presence of root-knot nematodes is lacking. The objective of this study is to evaluate the performance of okra grafted onto Hibiscus in the presence and absence of three root-knot nematodes species. We will adopt a completely randomized design in a 4x4 factorial scheme with ten replications.The first factor will consist of rootstocks: purple vinegar kenaf (Hibiscus acetosella Welw. Ex Hiern), false roselle (Hibiscus cannabinus L.), self-grafted and ungrafted. The second factor will be inoculation of 5,000 eggs and second-stage juveniles of Meloidogyne incognita, M. javanica and M. enterolobii, and uninoculated control. Vegetative development, agronomic performance and nematode reproduction will be measured.

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