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Effects of plant age and development on the Mi-1.2- mediated resistance of tomato against whitefly Bemisia tabaci.

AutorRodriguez, C.I.; Muñiz, Mariano ; Nombela, Gloria
Fecha de publicación2008
CitaciónXXIII International Congress of Entomology (ICE). Durban (Sudáfrica)
ResumenThe sweetpotato whitefly Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) is an important pest of horticultural crops worldwide. This insect causes damage directly through phloem feeding or indirectly by transmission of plant viruses such as Tomato Yellow Leaf Curl Diseases (TYLCDs). The tomato gene Mi-1.2 is responsible for resistance against the B and Q biotypes of B. tabaci, in addition to three species of root-knot nematodes (Meloidogyne spp.) and the potato aphid (Macrosiphum euphorbiae). It is known that tomato plants carrying Mi-1.2 are resistant to root-knot nematodes early in development: seedlings inoculated at 24 hours after germination are resistant to nematode infection. In contrast, the Mi-1.2-mediated resistance against potato aphid is developmentally regulated, with fully expanded leaves becoming resistant only when plants are 4 to 5 weeks of age. We have observed Mi-1.2-regulated resistance to B. tabaci in 8-week old tomato plants but not in other experiments with younger plants. However, a definitive study lacked to investigate whether Mi-1.2-mediated resistance against B. tabaci is developmentally regulated. Two sets of assays have been carried out in the present study, with tomato plants cv. Motelle (with Mi-1.2) and Moneymaker (lacking Mi-1.2 ) under free-choice and no-choice conditions, to determine if plant age or development could have any effect on whitefly resistance. In the first set of assays, 3-, 5- and 8-week old plants were compared. In the second set of assays, two groups of 8-week old plants were compared, which had been grown under different temperatures (24 or 19ºC) to obtain different plant developments.
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