AUTHOR=Guo Honggang , Sun Yucheng , Yan Hongyu , Li Chuanyou , Ge Feng 

TITLE=O3-Induced Priming Defense Associated With the Abscisic Acid Signaling Pathway Enhances Plant Resistance to Bemisia tabaci

JOURNAL=Frontiers in Plant Science

VOLUME=11

YEAR=2020

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2020.00093

DOI=10.3389/fpls.2020.00093

ISSN=1664-462X

ABSTRACT=<p>Elevated ozone (O<sub>3</sub>) modulates phytohormone signals, which subsequently alters the interaction between plants and herbivorous insects. It has been reported that elevated O<sub>3</sub> activates the plant abscisic acid (ABA) signaling pathway, but its cascading effect on the performance of herbivorous insects remains unclear. Here, we used the ABA-deficient tomato mutant <italic>notabilis</italic> (<italic>not</italic>) and its wild type, Ailsa Craig (AC), to determine the role of ABA signaling in mediating the effects of elevated O<sub>3</sub> on <italic>Bemisia tabaci</italic> in field open-top chambers (OTCs). Our results showed that the population abundance and the total phloem-feeding duration of <italic>B. tabaci</italic> were decreased by O<sub>3</sub> exposure in AC plants compared with <italic>not</italic> plants. Moreover, elevated O<sub>3</sub> and <italic>B. tabaci</italic> infestation activated the ABA signaling pathway and enhanced callose deposition in AC plants but had little effect on those in <italic>not</italic> plants. The exogenous application of a callose synthesis inhibitor (2-DDG) neutralized O<sub>3</sub>-induced resistance to <italic>B. tabaci</italic>, and the application of ABA enhanced callose deposition and exacerbated the negative effects of elevated O<sub>3</sub> on <italic>B. tabaci</italic>. However, the application of 2-DDG counteracted the negative effects of O<sub>3</sub> exposure on <italic>B. tabaci</italic> in ABA-treated AC plants. Collectively, this study revealed that callose deposition, which relied on the ABA signaling pathway, was an effective O<sub>3</sub>-induced priming defense of tomato plants against <italic>B. tabaci</italic> infestation.</p>