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<p>Salt stress is a major constraint to pomegranate cultivation in arid and semi-arid regions. This study evaluated the potential of lignin nanoparticles (LNP), derived from olive mill solid waste, to alleviate salt-induced damage in two pomegranate cultivars, ‘Kalai’ and ‘Testouri’. Plants were exposed to 150 mM NaCl for three months and treated weekly with LNP via foliar spray. Growth parameters, water status, chlorophyll fluorescence, oxidative stress markers, and biochemical traits were evaluated. Salt stress reduced total fresh and dry weight, relative water content (RWC), chlorophyll pigments, and photosystem II efficiency (ΦPSII), while increasing non-photochemical quenching (ΦNPQ) and malondialdehyde (MDA), particularly in the Kalai cultivar. LNP application significantly improved total fresh weight, ΦPSII, flavonoids and carotenoids in Kalai and decreased MDA content and ΦNPQ. It also maintained higher carbon levels and increased nitrogen content in both cultivars, contributing to adjustments in the C/N balance. In contrast, Testouri showed a more limited response to LNP treatment, with growth parameters, RWC, and fluorescence remaining largely unchanged, despite a reduction in H₂O₂ levels. LNP application partially mitigated salt-induced damage in pomegranate in a cultivar-dependent manner. These findings suggest that olive mill waste-derived lignin nanoparticles may represent a promising biostimulant for improving plant performance under salinity and encourage further studies under different environmental conditions, crops, and application rates.</p>

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Lignin Nanoparticles as a Sustainable Approach to Enhance Salt Tolerance in Pomegranate

  • 期刊论文

  • 发表日期：

    2026年6月26日

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  • Sahar Ben Abdelwaheb,
  • Azhar Ouni,
  • Josefina Bota,
  • Samia Abboud,
  • Jaume Puigserver,
  • Darine Tlili,
  • Mourad Jellali,
  • Noomene Sleimi,
  • Soumaya Dbara

摘要

Salt stress is a major constraint to pomegranate cultivation in arid and semi-arid regions. This study evaluated the potential of lignin nanoparticles (LNP), derived from olive mill solid waste, to alleviate salt-induced damage in two pomegranate cultivars, ‘Kalai’ and ‘Testouri’. Plants were exposed to 150 mM NaCl for three months and treated weekly with LNP via foliar spray. Growth parameters, water status, chlorophyll fluorescence, oxidative stress markers, and biochemical traits were evaluated. Salt stress reduced total fresh and dry weight, relative water content (RWC), chlorophyll pigments, and photosystem II efficiency (ΦPSII), while increasing non-photochemical quenching (ΦNPQ) and malondialdehyde (MDA), particularly in the Kalai cultivar. LNP application significantly improved total fresh weight, ΦPSII, flavonoids and carotenoids in Kalai and decreased MDA content and ΦNPQ. It also maintained higher carbon levels and increased nitrogen content in both cultivars, contributing to adjustments in the C/N balance. In contrast, Testouri showed a more limited response to LNP treatment, with growth parameters, RWC, and fluorescence remaining largely unchanged, despite a reduction in H₂O₂ levels. LNP application partially mitigated salt-induced damage in pomegranate in a cultivar-dependent manner. These findings suggest that olive mill waste-derived lignin nanoparticles may represent a promising biostimulant for improving plant performance under salinity and encourage further studies under different environmental conditions, crops, and application rates.