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New insights into the effect of plant development on the resistance to Bemisia tabaci in tomato mediated by the Mi-1 gene

AutorNombela, Gloria ; Rodriguez, C.I.; Muñiz, Mariano
Fecha de publicación2009
CitaciónThe 5th International Bemisia Workshop. Guangzhou. China
ResumenIn a previous study, we demonstrated that tomato resistance to Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae), regulated by the Mi-1 gene, is dependent on the plant development, with statistically significant differences between carrying- and lacking-Mi-1 plants in 8-week old tomato plants but not in younger plants. Similarly, tomato resistance to the potato aphid is developmentally regulated meanwhile the Mi-1 resistance to root-knot nematodes is expressed in tomato plants as soon as 12 hours after seed germination. Now we present new results from another study comparing Motelle (with Mi-1) and Moneymaker (without Mi-1) cultivars to clarify whether the determinant factor for the expression of Mi-1 gene in tomato resistance against B. tabaci is actually plant age or plant size. In order to obtain plants with the same age but different size, a group of plants from each cultivar were grown at 24ºC and other plants were grown at a lower temperature (19ºC). When all plants were 60-day-old, they were moved to a greenhouse to be freely infested by uniform releasing of B. tabaci (Q-biotype) adults. The numbers of adults were counted daily on every plant until the new adults emerged. In the normal size plants, higher values from the parameters analyzed were obtained in Moneymaker than were in Motelle, but the differences decreased in the small plants. This indicates that not only plant age, but also plant size is an important factor to be considered in the tomato response to B. tabaci mediated by the Mi-1 gene.
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