Victoria Lavrova is a researcher at laboratory for Animal and Plant Parasitology in Institute of Biology, Karelian Research Centre of Russian Academy of Sciences. Research interests are interactions between cyst-forming nematodes (Globodera rostochiensis, Globodera pallida) / root-knot nematode (Meloidogyne incognita) and their host plants: phytonematode biology and development, plant responses and resistance/susceptibility to the nematodes (morphology, physiology, defense-and resistance genes expression); Innate and induced resistance of plants; Priming of plant immunity. Technical skills in Plant Biology and Nematology. Participation in professional development courses and training seminars.
The root-knot nematodes (RKNs) Meloidogyne spp. are obligate sedentary endoparasites of root system of many plant species. M. incognita is widespread and economically important pest. There were investigated the expression of resistance Mi1.2 gene (encoding receptor proteins with the function of recognizing effectors secreted by nematode into plant tissue), PR1 and PR6 genes (markers of induced systemic plant resistance) in the roots of tomato plants pre-treated with Jasmonic acid (JA) during M. incognita invasion. It has been established that resistant and susceptible tomato plants have a similar level in transcripts accumulation of Mi1.2 and PR-genes at pre-invasion stage. However, differences between plants in the dynamics of the expression level of these genes were revealed during subsequent nematode invasion. In resistant plants it was accompanied by increased transcripts accumulation of Mi1.2 and PR-genes. In the roots of infested susceptible plants transcription of Mi1.2 gene was unchanged and of PR1 and PR6 genes was slightly induced. In the roots of JA-treated tomato plants transcription of Mi1.2 and PR6 genes were up-regulated prior and during nematode invasion. Increased expression of the Mi-1.2 gene at early stage of host-parasite relationships in combination with the high transcription of PR6 gene at the late stage of nematode parasitism promoted recognition of nematode attack and suppression of the possibility of their normal feeding and development. Thus, results have indicated exogenous treatments of tomato by JA modulate the accumulation of transcripts of resistance and defense genes that contribute to the formation of induced resistance to root-knot nematodes in the susceptible plants. The study was supported by RFBR (№15-04-04625).