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<p><i>Globisporangium izadpanahii</i>, a newly identified oomycete species from Iranian rice paddies, which was previously unclear in its ecological role due to the lack of symptoms on its native plant, is experimentally demonstrated to be a pathogen on <i>Pinus eldarica</i>—a major drought-tolerant conifer used in Iranian urban landscaping. Greenhouse inoculation trials showed that <i>G. izadpanahii</i> causes needle chlorosis, crown and root rot, stunted growth, and significant biomass reduction. Root and crown tissue colonization rates were very high (up to 95% and 83%, respectively), with major reductions in root dry weight (71%), foliar dry weight (64%), total biomass (66%), stem diameter, and height. The pathogen was re-isolated and molecularly verified, fulfilling Koch’s postulates. This study is the first to report the pathogenicity of <i>G. izadpanahii</i> on any host, demonstrating its potential threat to urban forestry. The results highlight the need for monitoring, nursery hygiene, and future research on resistance and management strategies to address oomycete-related tree decline in semi-arid urban environments.</p>

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First evidence of pathogenicity of Globisporangium izadpanahii on Pinus eldarica

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • Fatemeh Salmaninezhad,
  • Pouria Sekandarpour,
  • Reza Mostowfizadeh-Ghalamfarsa

摘要

Globisporangium izadpanahii, a newly identified oomycete species from Iranian rice paddies, which was previously unclear in its ecological role due to the lack of symptoms on its native plant, is experimentally demonstrated to be a pathogen on Pinus eldarica—a major drought-tolerant conifer used in Iranian urban landscaping. Greenhouse inoculation trials showed that G. izadpanahii causes needle chlorosis, crown and root rot, stunted growth, and significant biomass reduction. Root and crown tissue colonization rates were very high (up to 95% and 83%, respectively), with major reductions in root dry weight (71%), foliar dry weight (64%), total biomass (66%), stem diameter, and height. The pathogen was re-isolated and molecularly verified, fulfilling Koch’s postulates. This study is the first to report the pathogenicity of G. izadpanahii on any host, demonstrating its potential threat to urban forestry. The results highlight the need for monitoring, nursery hygiene, and future research on resistance and management strategies to address oomycete-related tree decline in semi-arid urban environments.