| Title: | "Compounds Associated with Infection by the Root-Knot Nematode, Meloidogyne javanica, Influence the Ability of Infective Juveniles to Recognize Host Plants" |
| Author(s): | Kihika R; Tchouassi DP; Ng'ang'a MM; Hall DR; Beck JJ; Torto B; |
| Address: | "Behavioral and Chemical Ecology Unit, International Centre of Insect Physiology and Ecology (icipe), P.O. Box 30772-00100, Nairobi, Kenya. Department of Chemistry, Kenyatta University, P.O. Box 43844-00100, Nairobi, Kenya. Natural Resources Institute, University of Greenwich-Medway Campus, Central Avenue, Chatham Maritime, Kent ME4 4TB, United Kingdom. Chemistry Research Unit, Center for Medical, Agricultural, and Veterinary Entomology, Agricultural Research Service, U.S. Department of Agriculture, 1700 SW 23rd Drive, Gainesville, Florida 32608, United States" |
| ISSN/ISBN: | 1520-5118 (Electronic) 0021-8561 (Linking) |
| Abstract: | "Plant root chemistry is altered by the parasitism of plant-parasitic nematodes (PPN). Here, we investigated the influence of the infective stage juveniles (J2) of Meloidogyne javanica in inducing tomato (Solanum lycopersicum) root volatiles and chemotactic effect on conspecifics. In olfactometer assays, J2 avoided the roots of 2-day infected plants but preferred 7-day-infected tomato compared to healthy plants. Chemical analysis showed a 2-7-fold increase in the amounts of monoterpenes emitted from tomato roots infected with M. javanica relative to healthy roots. In further bioassays, the monoterpenes beta-pinene, (+)-(2)-carene, alpha-phellandrene, and beta-phellandrene differentially attracted (51-87%) J2 relative to control. Concurrent reduction and increase in the levels of methyl salicylate and (Z)-methyl dihydrojasmonate, respectively, in the root volatiles reduced J2 responses. These results demonstrate that the host plant can alter its root volatile composition to inhibit PPN attack. The observed plant-produced inhibition of J2 warrants further investigation as a potential management tool for growers" |
| Keywords: | Animals Host-Parasite Interactions Solanum lycopersicum/chemistry/metabolism/*parasitology Plant Diseases/*parasitology Plant Roots/*chemistry/metabolism/parasitology Tylenchoidea/*growth & development/physiology Volatile Organic Compounds/*chemistry/meta; |
| Notes: | "MedlineKihika, Ruth Tchouassi, David P Ng'ang'a, Margaret M Hall, David R Beck, John J Torto, Baldwyn eng 2020/08/14 J Agric Food Chem. 2020 Aug 26; 68(34):9100-9109. doi: 10.1021/acs.jafc.0c03386. Epub 2020 Aug 13" |
