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Background and aim <p>Rhizospheric bacteria impact plant secondary metabolism. The volatile organic compounds (VOCs) contributing to the aroma of herbs and spices could be modulated through rhizospheric bacteria. However, there has been limited understanding on how rhizospheric microbes impact the VOC production in major spice (e.g., coriander).</p> Methods <p>Coriander was cultivated under sterile conditions, in natural field soil, in autoclaved soil, in autoclaved soil supplemented with soil microbial inoculum, and mono-inoculated with <i>Pseudomonas azotoformans</i> or <i>Bacillus megaterium</i> for hypothesis testing. VOC profiles were studied using GCMS, in conjunction with soil metagenomics and pathway enrichment analysis.</p> Results <p>Plant morphology and biomass remained unchanged by microbial treatments; however, microbial presence induced significant alterations in VOC composition. Specifically, the abundance of α-linolenic acid, linoleic acid, phytol, squalene, stigmasterol, etc., were high in microbe-rich field soil compared to plant grown in sterile tissue-culture. In comparison with sterile soil, plants grown in microbe-rich soil showed higher abundance of coumarin, cinnamic acid, squalene, etc., while the abundance of elaidic acid, behenic acid, stearic acid, nonanol, 1-octacosanol, etc., were relatively lower. Metabolomic profiles were differentially grouped based on microbial treatment, with monoculture inoculations producing strain-specific VOC signatures, while whole-microbiome inoculant reinstated a field-like VOC profile. Pathway analysis revealed the alterations of terpenoid and aldehyde biosynthesis.</p> Conclusion <p>Our findings underscore the essential function of rhizosphere bacteria in influencing coriander VOC production, suggesting potential strategies for enhancing crop flavor via microbiome management and the creation of specialized bio-inoculants.</p>

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Rhizospheric microbiota-driven metabolic shift results in altered volatile organic compounds in Coriandrum sativum L.

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Kungkamliu Newmei,
  • Nisha Chauhan,
  • Navneet Kaur Mattu,
  • Kulvir Singh,
  • Anil Kumar,
  • Priyankar Dey

摘要

Background and aim

Rhizospheric bacteria impact plant secondary metabolism. The volatile organic compounds (VOCs) contributing to the aroma of herbs and spices could be modulated through rhizospheric bacteria. However, there has been limited understanding on how rhizospheric microbes impact the VOC production in major spice (e.g., coriander).

Methods

Coriander was cultivated under sterile conditions, in natural field soil, in autoclaved soil, in autoclaved soil supplemented with soil microbial inoculum, and mono-inoculated with Pseudomonas azotoformans or Bacillus megaterium for hypothesis testing. VOC profiles were studied using GCMS, in conjunction with soil metagenomics and pathway enrichment analysis.

Results

Plant morphology and biomass remained unchanged by microbial treatments; however, microbial presence induced significant alterations in VOC composition. Specifically, the abundance of α-linolenic acid, linoleic acid, phytol, squalene, stigmasterol, etc., were high in microbe-rich field soil compared to plant grown in sterile tissue-culture. In comparison with sterile soil, plants grown in microbe-rich soil showed higher abundance of coumarin, cinnamic acid, squalene, etc., while the abundance of elaidic acid, behenic acid, stearic acid, nonanol, 1-octacosanol, etc., were relatively lower. Metabolomic profiles were differentially grouped based on microbial treatment, with monoculture inoculations producing strain-specific VOC signatures, while whole-microbiome inoculant reinstated a field-like VOC profile. Pathway analysis revealed the alterations of terpenoid and aldehyde biosynthesis.

Conclusion

Our findings underscore the essential function of rhizosphere bacteria in influencing coriander VOC production, suggesting potential strategies for enhancing crop flavor via microbiome management and the creation of specialized bio-inoculants.