Host Recognition and Specific Infection of <i>Endomelanconiopsis endophytica</i> during Early Infection
2023
Yan Xie | Liuqing Shi | Keke Cheng | Yang Li | Shixiao Yu
Coevolution between the pathogen and host plant drives pathogenic effector diversity. However, the molecular mechanism behind host-specific pathogenesis remains to be explored. Here, we present a 43 Mb whole-genome sequence of <i>Endomelanconiopsis endophytica</i> strain LS29, a host-specific pathogen of the common subtropical tree <i>Castanopsis fissa</i>. We described its genome annotations and identified its effector candidates. By performing temporal transcriptome sequencing of <i>E. endophytica</i> on <i>C. fissa</i> during early infection, we found that <i>E. endophytica</i> repressed other microbes in order to attack the tissue of the host by producing antibiotics earlier than 24 h post-inoculation (hpi). Simultaneously, a variety of effectors were secreted to recognize the host plant, but most of them showed a significantly opposing expression regulation trend after 24 hpi, indicating that 24 hpi represents a key time point between host recognition and specific infection. Furthermore, a comparison of isoenzymes showed that only a few effectors were identified as specific effectors, which were involved in hydrolyzing the compounds of the plant cell wall and releasing fatty acids during the early infection of <i>C. fissa</i>. Our results determined host recognition timing and identified a specific catalog of effectors, which are crucial for revealing the molecular mechanism of host-specific pathogenesis.
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