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A novel pine wood nematode effector, BxSCD1, suppresses plant immunity and interacts with an ethylene‐forming enzyme in pine
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A novel pine wood nematode effector, BxSCD1, suppresses plant immunity and interacts with an ethylene‐forming enzyme in pine
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Journal Article
A novel pine wood nematode effector, BxSCD1, suppresses plant immunity and interacts with an ethylene‐forming enzyme in pine
2021
Overview
The plant‐parasitic nematode Bursaphelenchus xylophilus, the causal agent of pine wilt disease (PWD), causes enormous economic loss every year. Currently, little is known about the pathogenic mechanisms of PWD. Several effectors have been identified in B. xylophilus, but their functions and host targets have yet to be elucidated. Here, we demonstrated that BxSCD1 suppresses cell death and inhibits B. xylophilus PAMP BxCDP1‐triggered immunity in Nicotiana benthamiana and Pinus thunbergii. BxSCD1 was transcriptionally upregulated in the early stage of B. xylophilus infection. In situ hybridization experiments showed that BxSCD1 was specifically expressed in the dorsal glands and intestine. Cysteine residues are essential for the function of BxSCD1. Transient expression of BxSCD1 in N. benthamiana revealed that it was primarily targeted to the cytoplasm and nucleus. The morbidity was significantly reduced in P. thunbergii infected with B. xylophilus when BxSCD1 was silenced. We identified 1‐aminocyclopropane‐1‐carboxylate oxidase 1, the actual ethylene‐forming enzyme, as a host target of BxSCD1 by yeast two‐hybrid and coimmunoprecipitation. Overall, this study illustrated that BxSCD1 played a critical role in the B. xylophilus–plant interaction. BxSCD1 suppressed plant immunity in Nicotiana benthamiana and Pinus thunbergii. We report for the first time that BxSCD1 interacts with an ethylene‐forming enzyme in pine.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc
Subject
