Resistência de porta-enxertos de cucurbitáceas a nematóides e compatibilidade da enxertia em melão

Abstract

Resistance of cucurbita rootstocks to nematodes and compatibility of grafting with net melonNematodes severely attack net melon plants under protected cultivation conditions. The objective of this research was to select rootstocks with resistance to Meloidogyne incognita and M. javanica. and musk cucumber (Sicana odorifera). To evaluate the resistance, seedlings were transplanted to pots and the root inoculated with 3,000 eggs and second stage juveniles of M. incognita and M. javanica. Fifty days after the inoculation, the plants were evaluated for nematode resistance by means of the reproduction factor. The grafting compatibility between net melon cvs. Bonus no. 2 and Fantasy and the rootstocks previously characterized as resistant were evaluated by means of 60 graftings. CNPH 01-962, CNPH 01-963 and melon 'Gaucho Redondo', were considered resistant to M. incognita. Melon 'Redondo Amarelo', watermelon 'Charleston Gray', watermelon Progênie da Coréia, Trichosanthes cucumerins were considered resistant to M. javanica. Benincasa hispida was resistant to M. javanica and M. incognita. The compatibility between net melons and resistant rootstocks was higher than 98%.

Reaction of melon genotypes to Meloidogyne incognita and Meloidogyne javanica

“…However, the authors state that these measures are laborious, burdensome and often inefficient. The use of resistant plants, therefore, is the most economical and efficient method to control root-knot nematodes in cucurbits, including muskmelon crops (Ito et al 2014).…”

“…Santos et al (1999) studied the resistance of muskmelon genotypes to M. incognita and observed that 2 of the 54 genotypes assessed exhibited resistance to the pathogen. Ito et al (2014) evaluated sources of cucurbit resistance to M. incognita and M. javanica and found that the 'Gaúcho Redondo' genotype was resistant to M. javanica. However, none of the genotypes is resistant to both species.…”

“…Ito et al (2014) studied the reaction of cucurbit genotypes that were rootstock candidates for muskmelon cultivation, obtaining four genotypes resistant to M. incognita , 'Gaúcho Redondo' melon and Benincasa hispida (winter melon)] and eight resistant to M. javanica [('Redondo Amarelo' and 'Chilton' melons, 'Charleston Gray' and Citrullus lanatus watermelons, Lagenaria siceraria (bottle gourd), Luffa cylindrica (sponge gourd), Benincasa hispida (winter melon) and Trichosanthes cucumerina (snake gourd)]. However, none of the genotypes assessed showed resistance to both species of root-knot nematodes, corroborating the results obtained here.…”

Genetic parameters of resistance to Meloidogyne incognita in melon

“…The identification of resistance to M. incognita in the 'Gaúcho Redondo' cultivar, carried out by ITO et al (2014), facilitated the study of inheritance for the trait in question. According to CRUZ & REGAZZI (1994), a genetic control study with generations F 1 , F 2 and backcrosses, including parental P 1 and P 2 , can lead to the quantification of the magnitude and nature of genetic variability in the segregating population and the assessment of the relative importance of genetic effects, which compose the averages of the studied populations.…”

Meloidogyne incognita and melon plants: host status, induced resistance and biological control

“…showed resistance for both root-knot species (Pinheiro and Amaro, 2010;Ferraz et al, 2012;Diniz et al, 2016a;Diniz et al, 2016b). Furthermore, there are some efforts to understand Cucumis metuliferus (E. Mey) resistance mechanism against root-knot nematode and use it for breeding programs (Ling et al, 2017;Ito et al, 2014;Pinheiro and Amaro, 2010). It is relevant to mention that most chemical nematicides have been removed from the market, mainly due to the environmental contamination risks and high toxicity of compounds to human health (Kerry, 1992).…”