Activity and reproductive capability of Meloidogyne incognita and sunflower growth response as influenced by root exudates of some medicinal plants

Soil Amendments with Spearmint, Peppermint and Rosemary Enhance the Community of Free-Living Nematodes and Improve Soil Quality, While Having Strikingly Different Effects on Plant Growth

“…On the other hand, spearmint essential oil and/or its constituents were found to inhibit seedling emergence and the growth of tomato, cotton, and several weeds [ 11 ], whereas the major essential-oil constituents of these three aromatic plants, including carvone, menthol, cineol, and camphor, were found to strongly inhibit both lettuce germination and seedling growth in laboratory experiments [ 12 , 13 ]. The essential oils of all three plants were also proven to be efficient against phytoparasitic nematodes [ 14 , 15 ], while improving through their root exudates the growth of infested sunflower plants [ 16 ]. The main reason for the often contrasting results stems from differences between experimental settings, as well as from the different forms of the plant materials used by researchers, e.g., plant macerates, composts, essential oils, and specific essential oil constituents.…”

Chemical composition of pequi essential oil (Caryocar brasiliense) and nematicidal activity in the control of Meloidogyne javanica

“…The chemical compounds (E)-ocimeone, ethyl octanoate and terpenes were shown to be nematicides (Massuh et al, 2017;Abdel-Rahman et al, 2019), and also these same compounds were found in the PEO and this confirmed the nematicidal effect. of the PEO in the J2 of M. javanica.…”

“…Natural plant substances have the potential to be used in the alternative control of plant diseases, especially in organic agriculture. Alkaloids, fatty acids, isothiocyanates, phenolic compounds and tannins are substances with known nematotoxic activities, and as the pequi mesocarp contains tannins and phenolic acids, the nematicidal effect observed in the present study comes from the substances identified from the PEO (E)-ocimeone, ethyl octanoate and terpenes (Coimbra et al, 2006;Gardiano et al, 2011;Mateus et al, 2014;Neves et al, 2008;Abdel-Rahman et al, 2019). pequi essential oil showed a high percentage of mortality of J2 in the treatment T5 (16 mg L -1 ) of 82% and T3 (4 mg L -1 ) of 66%, respectively.…”

“…It is worth mentioning of the compounds identified, 77.8% were esters and 22.2% monoterpenes. Some studies under laboratory conditions (Abdel-Rahman et al, 2019;Ferreira & De Paula Júnior, 2019;Ribeiro et al, 2012;Lopes, 2017;Massuh et al, 2017;Silva et al, 2021) demonstrate that terpenes, (E)-ocimeone, ethyl octanoate and phenolic acid have nematicidal action by reducing the rate of eclosion and cause the death of J2 of Meloidogyne spp., corroborating with the compounds present in the pequi peel and pulp found in the present study.…”

Vanillin in Resistant Tomato Plant Root Exudate Suppresses Meloidogyne incognita Parasitism

“…Xianke-8 (XK8), which exhibits reduced RKN damage and thus limits tomato production losses by nearly 30%, has been planted widely in the North China Plain (3466.67 hm 2 ). , Although the physiological mechanisms of resistant tomato plants against nematodes have been studied, ,, the effects of root exudates from resistant tomato on RKNs remain unclear. Root exudates play a key role in nematode–plant interactions. − Many root exudates capable of inhibiting PPNs significantly by repelling or killing parasitic second-stage juveniles (J2s) or inhibiting egg hatching have been identified and analyzed. − It has been hypothesized that particular compounds in resistant tomato plant root exudates play a crucial role in inhibiting PPNs in the rhizosphere. Therefore, identifying such root exudates of resistant tomato plants may provide an alternative control strategy for RKNs.…”