Abstract
The host response of fifteen winter squash (Cucurbita maxima) and five pumpkin (Cucurbita moschata) dihaploid genotypes to Meloidogyne arenaria, M. incognita, M. javanica, and M. luci was screened in pot experiments. Root galling and nematode reproduction were detected in all combinations of plant genotype and nematode species. Ten genotypes of C. maxima and three genotypes of C. moschata were considered highly resistant (<10% of the susceptible genotype) or moderately resistant (<50% of the susceptible genotype) to one or more Meloidogyne species based on nematode reproduction as a percentage of the most susceptible genotype. Genotypes 55CA15-A3 and G14-IP1 of C. maxima were highly resistant to M. luci and M. arenaria, respectively. Both 14BO01-O2 and G9-A4 genotypes of C. moschata were considered highly resistant to M. arenaria. However, these genotypes still allowed significant nematode reproduction because egg number per plant was higher than initial number of eggs used as inoculum, indicating that all genotypes were hosts.
Highlights
Root-knot nematodes (RKN), Meloidogyne spp., are considered one of the major plant-parasitic nematodes worldwide (Jones et al, 2013)
The objective of this study was to determine the resistance reactions of fifteen winter squash (C. maxima) and five pumpkin (C. moschata) genotypes that could be used as rootstocks to manage the four RKN species (M. arenaria, M. incognita, M. javanica, and M. luci)
In response to M. arenaria inoculation, the genotype G14-IP1 had the lowest number of eggs per gram root (2644 eggs) and was significantly different (P < 0.05) from other genotypes of C. maxima (Table 2)
Summary
Root-knot nematodes (RKN), Meloidogyne spp., are considered one of the major plant-parasitic nematodes worldwide (Jones et al, 2013). Meloidogyne arenaria, M. incognita, and M. javanica have commonly been referred to as ‘major’ RKN species because they are globally distributed and are the most destructive nematode species infecting vegetable crops, cucurbitaceous and solanaceous crops (Sikora and Fernández, 2005) In addition to these species, M. luci (formerly reported as M. ethiopica) is emerging as a significant problem for both open field and greenhouse vegetable crops in northern Turkey (Aydınlı and Mennan, 2016; Aydınlı, 2018). The objective of this study was to determine the resistance reactions of fifteen winter squash (C. maxima) and five pumpkin (C. moschata) genotypes that could be used as rootstocks to manage the four RKN species (M. arenaria, M. incognita, M. javanica, and M. luci)
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