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Elevated ozone (O 3 ) can alter the phenotypes of host plants particularly in induction of leaf senescence, but few reports examine the involvement of phytohormone in O 3 -induced changes in host phenotypes that influence the foraging quality for insects. Here, we used an ethylene (ET) receptor mutant  Nr  and its wild-type to determine the function of the ET signaling pathway in O 3 -induced leaf senescence, and bottom-up effects on the performance of  Bemisia tabaci  in field open-top chambers (OTCs). Our results showed that elevated O 3  reduced photosynthetic efficiency and chlorophyll content and induced leaf senescence of plant regardless of plant genotype. Leaf senescence in  Nr  plants was alleviated relative to wild-type under elevated O 3 . Further analyses of foliar quality showed that elevated O 3  had little effect on phytohormone-mediated defenses, but significantly increased the concentration of amino acids in two plant genotypes. Furthermore,  Nr  plants had lower amino acid content relative to wild-type under elevated O 3 . These results provided an explanation of O 3 -induced increase in abundance of  B. tabaci.  We concluded that O 3 -induced senescence of plant was ET signal-dependent, and positive effects of O 3 -induced leaf senescence on the performance of  B. tabaci  largely resulted from changes of nutritional quality of host plants.

O3-Induced Leaf Senescence in Tomato Plants Is Ethylene Signaling-Dependent and Enhances the Population Abundance of Bemisia tabaci