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Oxford University Press (OUP) Horticulture Research 11(8)
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    초록·키워드

    <i>Ralstonia solanacearum</i> (<i>Rso</i>) causes destructive bacterial wilt across a broad range of host plants by delivering a repertoire of type III effectors. In the present study, we determined that the deletion of the type III effector RipAF1 resulted in increased virulence on <i>Nicotiana benthamiana</i>, <i>Solanum lycopersicum</i>, and <i>Capsicum annuum</i> plants. RipAF1 showed ADP-ribosylation activity <i>in vivo</i> and <i>in vitro</i>. Transient overexpression of RipAF1 suppressed jasmonic acid (JA) signaling and induced salicylic acid (SA) signaling. The ADP-ribosylation activity of RipAF1 was essential for JA and SA signaling mediation. Host fibrillin FBN1 was identified as a RipAF1-interactor that is ADP-ribosylated by RipAF1 directly. Most importantly, the ADP-ribosylation of conserved residues of FBN1 contributes to its localization to the plasma membrane and leads to the suppression of JA signaling and induction of SA signaling. We concluded that RipAF1 mediates antagonistic crosstalk between JA and SA signaling pathways by ADP-ribosylation of FBN1.

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