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<p>Thirteen accessions from a collection of <i>Panicum coloratum</i> var. <i>coloratum</i> in Argentina were evaluated under hypoxia, salinity, and combined salinity-hypoxia to assess variability in stress tolerance in a controlled hydroponic experiment. Biomass production, relative growth rate, root:shoot ratio, relative water content, and tolerance indices were evaluated. Salinity and combined stress caused the greatest reductions in plant growth, whereas hypoxia alone had smaller effects. Relative growth rate decreased by 4.4% under hypoxia, 14.1% under salinity, and 16.9% under combined stress compared with the control. Root:shoot ratio increased under all stress treatments, particularly under hypoxia and combined stress, indicating shifts in biomass allocation. Significant differences among accessions were detected for root biomass, relative growth rate, tolerance indices, and stress interaction responses. Interaction analysis revealed additive responses in 46% of the accessions, synergistic responses in 38%, and antagonistic responses in 15%. The observed variability in stress interaction patterns suggests distinct tolerance mechanisms. No significant association between relative growth rate and stress tolerance was apparent. Overall, these results demonstrate intraspecific variation and provide information for breeding programmes aimed at improving forage adaptation to saline and waterlogged environments.</p>

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Intraspecific variation in tolerance to salinity, hypoxia and their combination in a Panicum coloratum var. coloratum germplasm collection

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Camila Ramirez,
  • Luciana Umbriago,
  • Mauro Ezequiel Lifschitz,
  • María Andrea Tomás

摘要

Thirteen accessions from a collection of Panicum coloratum var. coloratum in Argentina were evaluated under hypoxia, salinity, and combined salinity-hypoxia to assess variability in stress tolerance in a controlled hydroponic experiment. Biomass production, relative growth rate, root:shoot ratio, relative water content, and tolerance indices were evaluated. Salinity and combined stress caused the greatest reductions in plant growth, whereas hypoxia alone had smaller effects. Relative growth rate decreased by 4.4% under hypoxia, 14.1% under salinity, and 16.9% under combined stress compared with the control. Root:shoot ratio increased under all stress treatments, particularly under hypoxia and combined stress, indicating shifts in biomass allocation. Significant differences among accessions were detected for root biomass, relative growth rate, tolerance indices, and stress interaction responses. Interaction analysis revealed additive responses in 46% of the accessions, synergistic responses in 38%, and antagonistic responses in 15%. The observed variability in stress interaction patterns suggests distinct tolerance mechanisms. No significant association between relative growth rate and stress tolerance was apparent. Overall, these results demonstrate intraspecific variation and provide information for breeding programmes aimed at improving forage adaptation to saline and waterlogged environments.