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<p>Deciphering adaptation to habitat shifts across the salinity boundary necessitates investigation of “lost” and “acquired” saline genes. By assembling a telomere-to-telomere genome, we propose that the euryhaline Chlorophyta <i>Chlorella</i> sp. MEM25 represents an early-diverging saltwater species that has evolved numerous genes essential for saltwater-freshwater transitions. By comparison with Viridiplantae genomes, we identify ancestral genes and lineage-specific genes related to salinity adaptation. Loss-of-function mutants of the proposed salt-sensitive genes in algae and plants exhibit increased salt resistance, highlighting the potential of the MEM25 genome as a breeding resource. Notably, the gene <i>RMI1</i> plays an important role in salinity tolerance across species, from microalgae to higher plants.</p>

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Cross-species dissection of saline-related genes by genetically deciphering a euryhaline microalga Chlorella sp

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月13日

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  • Aoqi Wang,
  • Qinhua Gan,
  • Yi Xin,
  • Ying Deng,
  • Xiao Han,
  • Yandu Lu

摘要

Deciphering adaptation to habitat shifts across the salinity boundary necessitates investigation of “lost” and “acquired” saline genes. By assembling a telomere-to-telomere genome, we propose that the euryhaline Chlorophyta Chlorella sp. MEM25 represents an early-diverging saltwater species that has evolved numerous genes essential for saltwater-freshwater transitions. By comparison with Viridiplantae genomes, we identify ancestral genes and lineage-specific genes related to salinity adaptation. Loss-of-function mutants of the proposed salt-sensitive genes in algae and plants exhibit increased salt resistance, highlighting the potential of the MEM25 genome as a breeding resource. Notably, the gene RMI1 plays an important role in salinity tolerance across species, from microalgae to higher plants.