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<p>Salinity is one of the most serious stress factors limiting rice cultivation. Cyanobacterial seed priming and application have been reported to mitigate the adverse impact of salinity stress and promote plant growth. Therefore, the present investigation was undertaken to evaluate the effect of seed priming and inoculation with <i>Nostoc</i> sp. BTA 710 and <i>Anabaena doliolum</i> on the growth and physiological activity of rice plants under salinity stress conditions. Salinity stress treatments (60 and 120&#xa0;mM NaCl) imposed at tillering stage significantly reduced growth, pigment content and photosynthetic activity in non-primed and non-inoculated plants (T<sub>2</sub> and T<sub>3</sub>). However, primed and inoculated plants (C<sub>1</sub>T<sub>2</sub>, C<sub>2</sub>T<sub>2</sub>, C<sub>1</sub>T<sub>3</sub> and C<sub>2</sub>T<sub>3</sub>) exhibited comparatively lower reductions in growth, pigment content and photosynthetic activity under salinity stress conditions. Furthermore, primed and inoculated plants subjected to salinity stress showed reduced accumulation of superoxide radicals and lipid peroxidation products and maintained a favourable Na<sup>+</sup>/K<sup>+</sup> ratio. Priming and cyanobacterial inoculation also modulated the activity of antioxidant enzymes under saline conditions. Thus, the results suggest that cyanobacterial seed priming and application alleviates the detrimental effects of salinity in rice by restricting the uptake of Na<sup>+</sup> ions, decreasing the accumulation of malondialdehyde and superoxide&#xa0;radicals , modulation of antioxidant enzymes and maintaining ion homeostasis.</p>

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Cyanobacterial seed priming and inoculation mitigates salinity stress in transplanted rice through the regulation of growth, photosynthesis and ion metabolism

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Teenu Paul,
  • Pranita Jaiswal,
  • Venkadasamy Govindasamy,
  • Rakesh Pandey,
  • Sarvendra Kumar,
  • Gerard Abraham

摘要

Salinity is one of the most serious stress factors limiting rice cultivation. Cyanobacterial seed priming and application have been reported to mitigate the adverse impact of salinity stress and promote plant growth. Therefore, the present investigation was undertaken to evaluate the effect of seed priming and inoculation with Nostoc sp. BTA 710 and Anabaena doliolum on the growth and physiological activity of rice plants under salinity stress conditions. Salinity stress treatments (60 and 120 mM NaCl) imposed at tillering stage significantly reduced growth, pigment content and photosynthetic activity in non-primed and non-inoculated plants (T2 and T3). However, primed and inoculated plants (C1T2, C2T2, C1T3 and C2T3) exhibited comparatively lower reductions in growth, pigment content and photosynthetic activity under salinity stress conditions. Furthermore, primed and inoculated plants subjected to salinity stress showed reduced accumulation of superoxide radicals and lipid peroxidation products and maintained a favourable Na+/K+ ratio. Priming and cyanobacterial inoculation also modulated the activity of antioxidant enzymes under saline conditions. Thus, the results suggest that cyanobacterial seed priming and application alleviates the detrimental effects of salinity in rice by restricting the uptake of Na+ ions, decreasing the accumulation of malondialdehyde and superoxide radicals , modulation of antioxidant enzymes and maintaining ion homeostasis.