Effects of Melatonin on Tomato Infected with Root-knot Nematode Meloidogyne incognita

This study was conducted in 2020 to investigate the influence of melatonin (10, 50 and 100 µM) given three methods (immersion, irrigation, foliar spraying) on some physiological aspects tomato seedlings inoculated with root-knot nematode Meloidogyne incognita [(Kofoid White) Chitwood]. The were 1000 second-stage juveniles M. incognita. Dualex® optic sensor used situ measure total chlorophylls, flavonols, anthocyanins contents nitrogen balance index (NBI). Results indicated that while no significant effects observed chlorophyll content, ameliorated adverse depending concentration mode application. Flavonols at highest irrigated plants lowest immersed ones. NBI affected by method applied, immersing boosted it irrigation caused a decrease. Irrigation resulted significantly higher compared other two methods. One observation applying low medium concentrations soil containing increased anthocyanin content plant. Melatonin merits value developing response against but needs further elucidation.