4.6 Article

The Phytophthora sojae RXLR effector Avh238 destabilizes soybean Type2 GmACSs to suppress ethylene biosynthesis and promote infection

期刊

NEW PHYTOLOGIST
卷 222, 期 1, 页码 425-437

出版社

WILEY
DOI: 10.1111/nph.15581

关键词

ethylene; Phytophthora sojae; plant immunity; RXLR effector; Type2 ACS

资金

  1. China National Funds for Innovative Research Groups [31721004]
  2. National Postdoctoral Program for Innovative Talents [BX20180142]

向作者/读者索取更多资源

Phytophthora pathogens secrete many effector proteins to manipulate host innate immunity. PsAvh238 is a Phytophthora sojae N-terminal Arg-X-Leu-Arg (RXLR) effector, which evolved to escape host recognition by mutating one nucleotide while retaining plant immunity-suppressing activity to enhance infection. However, the molecular basis of the PsAvh238 virulence function remains largely enigmatic. By using coimmunoprecipitation and liquid chromatography-tandem mass spectrometry analysis, we identified the 1-aminocyclopropane-1-carboxylate synthase (ACS) isoforms, the key enzymes in ethylene (ET) biosynthesis, as a host target of PsAvh238. We show that PsAvh238 interacts with soybean ACSs (GmACSs) in vivo and in vitro. By destabilizing Type2 GmACSs, PsAvh238 suppresses Type2 ACS-catalyzed ET biosynthesis and facilitates Phytophthora infection. Silencing of Type2 GmACSs, and inhibition of ET biosynthesis or signaling, increase soybean susceptibility to P. sojae infection, supporting a role for Type2 GmACSs and ET in plant immunity against P. sojae. Moreover, wild-type P. sojae but not the PsAvh238-disrupted mutants, inhibits ET induction and promotes P. sojae infection in soybean. Our results highlight the ET biosynthesis pathway as an essential part in plant immunity against P. sojae and a direct effector target.

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