Effect of Grafting on Resistance of Cucurbit Hybrids against Meloidogyne incognita Infection under Greenhouse Conditions
Effect of Grafting on Resistance of Cucurbit Hybrids against Meloidogyne incognita Infection under Greenhouse Conditions
Nourhan M.M. Hassnin, Ali H.H. Ali and Hosny H. Kesba*
ABSTRACT
The host response of cucurbit hybrids (6001 F1, BS F1, Ohbkatosa F1, and RG F1) as rootstocks, watermelon hybrids (Aswan F1 and Nems) as scions, and their accessions to Meloidogyne incognita was detected. Nematode penetration, development, and potential reproduction were estimated. The rootstocks (6001 F1, Ohbkatosa F1, and RG F1) were considered highly resistant and BS F1 resistant. Scions (Aswan F1, and Nems) were moderately susceptible. Grafted watermelon hybrids varied in their reaction to nematode infection. Rootstock, 6001 F1 reduced significantly nematode parameters meanwhile BS F1 was insignificant. Levels of ClabZIP59 and ClabZIP52 genes expression were upregulated significantly in nematode infected treatments compared to the check. Root exudates of Aswan F1/6001 F1 (HR) and Aswan F1/BS F1 (MS) cultivars were analyzed by GC/MS/MS and revealed that the most abundant components in the root exudates were fatty acids, terpenoids, alkaloids, alcohols, and esters with different concentrations. Terpenoids were the major compounds in root exudates of HR cultivar and fatty acids in MS ones. Such phytochemicals’ high ratios were proportionally connected with the host resistance reaction.
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