Suppressive effect of abscisic acid on systemic acquired resistance in tobacco plants |
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| Authors: | Miyuki Kusajima Michiko Yasuda Akiko Kawashima Hideaki Nojiri Hisakazu Yamane Masami Nakajima Katsumi Akutsu Hideo Nakashita |
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| Institution: | (1) RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;(2) Faculty of Agriculture, Ibaraki University, 3-21-1 Ami-machi, Inashiki-gun, Ibaraki 300-0393, Japan;(3) Biotechnology Research Center, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; |
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| Abstract: | Recent studies have indicated that the phytohormone abscisic acid (ABA), induced in response to a variety of environmental
stresses, plays an important role in modulating diverse plant–pathogen interactions. In Arabidopsis
thaliana, we previously clarified that ABA suppressed the induction of systemic acquired resistance (SAR), a plant defense system
induced by pathogen infection through salicylic acid (SA) accumulation. We investigated the generality of this suppressive
effect by ABA on SAR using tobacco plants. For SAR induction, we used 1,2-benzisothiazole-3(2H)-one 1,1-dioxide (BIT) and benzo(1,2,3)thiadiazole-7-carbothioic acid S-methyl ester (BTH) that activate upstream and downstream of SA in the SAR signaling pathway, respectively. Wild-type tobacco
plants treated with BIT or BTH exhibited enhanced disease resistance against Tobacco mosaic virus (TMV) and tobacco wildfire bacterium, Pseudomonas syringae pv. tabaci (Pst), however, which was suppressed by pretreatment of plants with ABA. Pretreatment with ABA also suppressed the expression
of SAR-marker genes by BIT and BTH, indicating that ABA suppressed the induction of SAR. ABA suppressed BTH-induced disease
resistance and pathogenesis-related (PR) gene expression in NahG-transgenic plants that are unable to accumulate SA. The accumulation of SA in wild-type plants after BIT treatment was also
suppressed by pretreatment with ABA. These data suggest that ABA suppresses both upstream and downstream of SA in the SAR
signaling pathway in tobacco. |
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