Fourth International Bemisia Workshop International Whitefly Genomics Workshop
Induced Plant Responses in the Bemisia tabaci-Tomato System
Plant Protection Department, Instituto de Ciencias Agrarias - Centro de Ciencias Medioambientales (CSIC), Madrid, Spain. Correspondence: gnombela@ccma.csic.es
Some plants have constitutive barriers against possible attacks by pests or pathogens, and plant resistance is an alternative tool to the use of environmentally damaging insecticides in integrated control. In addition, plants can activate protective mechanisms upon contact with a previous invader. This interesting phenomenon is termed induced or acquired resistance and often protects the plant against a second invasion by the same or another pest or pathogen. At times, the induced responses in the plant need not necessarily be negative to subsequent invaders and could produce beneficial effects to such organisms. It is known that some biological agents such as certain bacteria and fungi can induce plant resistance to other pathogens. However, few investigations have been conducted to date to evaluate host-plant induced responses to piercing-sucking insects in susceptible horticultural crop plants. Recently, we have demonstrated that plant resistance to whitefly Bemisia tabaci was induced in susceptible tomato plants after infestation by the potato aphid Macrosiphum euphorbiae, but not the reverse. Now we present preliminary results from a study investigating whether plant resistance to B. tabaci (B biotype) could be induced in susceptible tomato plants (cv. Marmande) by a previous infestation with the same insect pest or, on the contrary, whether responses elicited in the plant would enhance suitability to this whitefly species.
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