Blue-light receptor phototropin 1 suppresses immunity to promote Phytophthora infestans infection.

Blue-light receptor phototropin 1 suppresses immunity to promote Phytophthora infestans infection.
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DOI:
10.1111/nph.17929
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发表时间:
2022-03
期刊:
影响因子:
9.4
通讯作者:
Birch, Paul R. J.
Birch, Paul R. J.
中科院分区:
生物学1区
文献类型:
--
作者:
Naqvi, Shaista;He, Qin;Trusch, Franziska;Qiu, Huishan;Pham, Jasmine;Sun, Qingguo;Christie, John M.;Gilroy, Eleanor M.;Birch, Paul R. J.

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蓝光(BL)向光素受体(phot1和phot2)通过激活NPH3/RPT2样(NRL)家族成员来调节植物生长。关于蓝光和向光素在调节植物免疫中的作用知之甚少。我们之前表明,致病疫霉RXLR效应因子Pi02860靶向马铃薯(St)NRL1,通过促进蛋白酶体介导的免疫调节因子StSWAP70的降解来增强其促进感病性的能力。这就提出了一个问题:蓝光和向光素是否负向调节免疫? 我们采用免疫共沉淀、病毒诱导的基因沉默、瞬时过表达和靶向突变来研究向光素在调节免疫中的作用。 虽然Stphot1和Stphot2的瞬时过表达增强了致病疫霉在本氏烟上的定殖,但沉默内源的Nbphot1或Nbphot2会减少感染。Stphot1(而非Stphot2)以蓝光和NRL1依赖的方式抑制INF1触发的细胞死亡(ICD)免疫反应。当Stphot1与StNRL1共表达时,会促进StSWAP70的降解,而Stphot2则不会。激酶失活的Stphot1无法抑制ICD、增强致病疫霉的定殖或促进StSWAP70的降解。关键的是,蓝光增强了致病疫霉的感染,这可能涉及向光素,但不涉及其他蓝光受体,如隐花色素以及F - 盒蛋白ZTL1和FKF1。 我们证明了Stphot1和Stphot2在促进感病性方面发挥不同的作用,并且Stphot1的激酶活性是蓝光和StNRL1介导的免疫抑制所必需的。
Blue‐light (BL) phototropin receptors (phot1 and phot2) regulate plant growth by activating NPH3/RPT2‐like (NRL) family members. Little is known about roles for BL and phots in regulating plant immunity. We showed previously that Phytophthora infestans RXLR effector Pi02860 targets potato (St)NRL1, promoting its ability to enhance susceptibility by facilitating proteasome‐mediated degradation of the immune regulator StSWAP70. This raises the question: do BL and phots negatively regulate immunity? We employed coimmunoprecipitation, virus‐induced gene silencing, transient overexpression and targeted mutation to investigate contributions of phots to regulating immunity. Whereas transient overexpression of Stphot1 and Stphot2 enhances P. infestans colonization of Nicotiana benthamiana, silencing endogenous Nbphot1 or Nbphot2 reduces infection. Stphot1, but not Stphot2, suppressed the INF1‐triggered cell death (ICD) immune response in a BL‐ and NRL1‐dependent manner. Stphot1, when coexpressed with StNRL1, promotes degradation of StSWAP70, whereas Stphot2 does not. Kinase‐dead Stphot1 fails to suppress ICD, enhance P. infestans colonization or promote StSWAP70 degradation. Critically, BL enhances P. infestans infection, which probably involves phots but not other BL receptors such as cryptochromes and F‐box proteins ZTL1 and FKF1. We demonstrate that Stphot1 and Stphot2 play different roles in promoting susceptibility, and Stphot1 kinase activity is required for BL‐ and StNRL1‐mediated immune suppression.
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