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Engineering plants for nematode resistance - satyajit jagtap - 10-04-2017 Engineering plants for nematode resistance [attachment=18185] INTRODUCTION Nematodes are obligate parasites Obtain nutrition from plant cytoplasm Species includes ectoparasites and endoparasites Sedentary endoparasites of the family Heteroderidae cause most economic damage Heteroderidae divided into 2 groups Feeding habits of nematodes Ectoparasitic nematodes Live completely outside the plant Migratory endoparasitic nematodes Live completely inside the plant but move freely between the roots and soil Sedentary endoparasitic nematodes Live inside the plant but adult female becomes sedentary Semi- endoparasitic nematodes Part of body inside root. By movement when feeding 1.Strategies targeting directly the nematode Exploit the structural difference between nematodes and plants Eg:- chitin and collagen, both are important components of the nematode and absent in plants Transgenic plants expressing chitinase and collagenase were constructed Nematode resistant plants have not been reported so far RESISTANCE MECHANISMS In resistant tomatoes a localized necrosis, suggesting a HR is visible near the anterior end of the nematode within a few days of infection. 2. HI (Gpa2) mediated resistance of potato, the feeding site becomes surrounded by necrotic tissues and collapses. 3. HsIPro-I Not involved in hypersensitive response. Nematode die in the last J2 stage. Because of degradation of the feeding structure(syncytium) in the host. |