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<p>Salinity stress impedes the growth, physiology, metabolism and yield of crops. The present study was carried out to quantify the critical tolerance limits of oat genotypes to field salinity levels (2.9–3.2; S0; control; 4.4–5.7; moderate; S1; and 6.9–7.3; high salinity; S2 dS m<sup>−1</sup>). The S2 treatment reduced growth attributes, which contributed to the reduction in fresh (FWM) and dry biomass (DWM) by 46.52 and 40.32%, respectively. Similarly, the oat genotypes were tested under imposed salinity levels (50&#xa0;mM; S1′; and 100&#xa0;mM; S2′) of NaCl + Na<sub>2</sub>SO<sub>4</sub> (1:1) with control (S0′) where relative water content (RWC %) and membrane stability index (MSI %) were reduced; however, malonaldehyde content and SPAD values were increased as salinity level increased. Salinity also elicited the plant defense by elevating the superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and proline content. Further, a significant positive correlation (<i>p</i> &lt; 0.001) was found among RWC and MSI, proline and APX, SPAD and CAT, and CAT and PRO at 75&#xa0;days after sowing under the S2′ stress. Meanwhile, FWM showed a significant positive correlation (<i>p</i> &lt; 0.001) with DWM and PL under field S2 levels. The PCA analysis for growth and biochemical attributes under higher salinity levels showed 83.85 and 89.11% of the total genetic variation for field and pot experiments, respectively. A gene expression study of a few known salt stress-specific candidate genes, such as sodium/hydrogen exchanger, potassium transporter and glutathione S-transferase, revealed their significant differential expression under salt stress. Therefore, this study gives a new insight into understanding basic tolerance mechanisms to adapt salinity stress and developing salinity-tolerant oats.</p>

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Effect of salinity stress on growth, physio-biochemical and ion homeostasis and activation of antioxidant defense responses in Avena spp.

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Shahid Ahmed,
  • Parichita Priyadarshini,
  • I. Indu,
  • Maneet Rana,
  • Gajender Yadav,
  • A. K. Rai,
  • Subhash Chand,
  • Monika Yadav,
  • Mahendra Singh,
  • Rajesh Kumar Singhal

摘要

Salinity stress impedes the growth, physiology, metabolism and yield of crops. The present study was carried out to quantify the critical tolerance limits of oat genotypes to field salinity levels (2.9–3.2; S0; control; 4.4–5.7; moderate; S1; and 6.9–7.3; high salinity; S2 dS m−1). The S2 treatment reduced growth attributes, which contributed to the reduction in fresh (FWM) and dry biomass (DWM) by 46.52 and 40.32%, respectively. Similarly, the oat genotypes were tested under imposed salinity levels (50 mM; S1′; and 100 mM; S2′) of NaCl + Na2SO4 (1:1) with control (S0′) where relative water content (RWC %) and membrane stability index (MSI %) were reduced; however, malonaldehyde content and SPAD values were increased as salinity level increased. Salinity also elicited the plant defense by elevating the superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and proline content. Further, a significant positive correlation (p < 0.001) was found among RWC and MSI, proline and APX, SPAD and CAT, and CAT and PRO at 75 days after sowing under the S2′ stress. Meanwhile, FWM showed a significant positive correlation (p < 0.001) with DWM and PL under field S2 levels. The PCA analysis for growth and biochemical attributes under higher salinity levels showed 83.85 and 89.11% of the total genetic variation for field and pot experiments, respectively. A gene expression study of a few known salt stress-specific candidate genes, such as sodium/hydrogen exchanger, potassium transporter and glutathione S-transferase, revealed their significant differential expression under salt stress. Therefore, this study gives a new insight into understanding basic tolerance mechanisms to adapt salinity stress and developing salinity-tolerant oats.