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The Influence of Some Metabolic Inhibitors On the Response of Susceptible/Resistant Cultivars of Tomato To Meloidogyne Incognita

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The effect of cycloheximide and puromycin (protein synthesis inhibitors) and actinomycin D (RNA synthesis inhibitor) was studied on host parasite interaction between Meloidogyne incognita and susceptible and resistant cultivars of tomato, Lycopersicon esculentum. The concentrations of cycloheximide (1 ppm) and puromycin (40 ppm) which caused great inhibition of root growth, did not affect the galling response or nematode establishment and development in the infected, susceptible cultivar. Thus, a high level of protein synthesis may not be required for initiation of susceptible response to M. incognita infection. However, relatively high concentrations of cycloheximide (2.5 ppm) and puromycin (55 ppm) did inhibit galling and larval development, suggesting that, a certain minimum level of protein synthesis is necessary for establishment of the nematode within the susceptible host. The concentrations of Actinomycin D that were inhibitory to root growth were also inhibitory to galling. In the resistant cultivar, cycloheximide treated infected roots did not exhibit any browning (hypersensitive reaction, HR) of cells surrounding the nematodes within the roots. Our results suggest that lack of HR in these roots many have led to exit of the nematodes from the roots. Hence, inhibition of HR does not confer susceptibility to the resistant plants. Some other factor seems to be necessary for the plants to develop susceptibility to M. incognita. Alternatively, some mechanism of resistance other than HR may be operative within the resistant plants. Puromycin does not show any inhibitory effect on the visible browning of the root tips in the resistant plants.

Affiliations: 1: Department of Biological Sciences, Simon Fraser University, Burnaby, B.C., Canada V5A 1S6


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