Scholarlink

<p>Parasitic oomycetes are ubiquitous in marine ecosystems, yet their phylogeny remains poorly characterized. While metabarcoding confirms their high diversity, the lack of formal descriptions leaves most of the sequences unclassified. In this study, we describe <i>Miracula nipponica</i> sp. nov., a parasitic oomycete from Sagami Bay, infecting the bloom-forming diatom <i>Leptocylindrus</i> sp. Phylogenetic analysis based on 18S rDNA sequences showed that all isolated strains were placed as a distinct lineage within the genus <i>Miracula</i>. Detailed microscopic observations revealed the formation of primary and secondary zoospores in the new species life cycle, with an occasional cyst cluster formation at the orifice of the discharge tube. Notably, the encysted stage demonstrated a long-term viability in the absence of hosts. Finally, laboratory experiments revealed a broad host range with low infection prevalence that includes other common diatoms from the study area. As the first parasitic oomycete infecting phytoplankton described in Japanese coastal waters, this study highlights their overlooked diversity and widespread presence of fungi-like organisms in marine ecosystems.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Miracula nipponica: a new marine oomycete parasitizing the diatom Leptocylindrus sp. in Sagami Bay, Japan

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月28日

查看全文
  • Núria Pou-Solà,
  • Kensuke Seto,
  • Maui Tahara,
  • Yoshiki Takayama,
  • Shinji Shimode,
  • Maiko Kagami

摘要

Parasitic oomycetes are ubiquitous in marine ecosystems, yet their phylogeny remains poorly characterized. While metabarcoding confirms their high diversity, the lack of formal descriptions leaves most of the sequences unclassified. In this study, we describe Miracula nipponica sp. nov., a parasitic oomycete from Sagami Bay, infecting the bloom-forming diatom Leptocylindrus sp. Phylogenetic analysis based on 18S rDNA sequences showed that all isolated strains were placed as a distinct lineage within the genus Miracula. Detailed microscopic observations revealed the formation of primary and secondary zoospores in the new species life cycle, with an occasional cyst cluster formation at the orifice of the discharge tube. Notably, the encysted stage demonstrated a long-term viability in the absence of hosts. Finally, laboratory experiments revealed a broad host range with low infection prevalence that includes other common diatoms from the study area. As the first parasitic oomycete infecting phytoplankton described in Japanese coastal waters, this study highlights their overlooked diversity and widespread presence of fungi-like organisms in marine ecosystems.

Graphical Abstract