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<p>Variations in reproductive stage stress tolerance account for the significant variations in salt tolerance of glycophytes, such as chickpeas. There is a dearth of understanding about the traits and donors for reproductive stage salinity tolerance in chickpeas. Previous studies focus on screening for seedling-stage tolerance or selection based solely on yield without examining component traits. In the present study, observations were recorded from stress and control treatments at the flowering stage from a hydroponic experimental setup. The traits measured in the study were significantly impacted by salinity, showing noticeable differences between the tolerant checks (ICCV-10 and CSG-8962) and sensitive (DCP-92-3 and Pusa-256) chickpea genotypes. The tolerant lines showed comparatively better shoot and root growth than the two sensitive genotypes. Osmotic component traits, such as retention of photosynthetic pigments, biomass, and photosynthetic rate, as well as stomatal conductance, partially contributed to the tolerance. We also found significant variations in the Na<sup>+</sup>/K<sup>+</sup> ratio among genotypes differing in salinity tolerance, sampled at the flowering stage, suggesting variation in ionic stress and tissue tolerance. The expression of salinity tolerance-related genes in contrasting genotypes also uncovered differences in their genetic mechanisms. The key physiological traits and gene expression during the flowering stage are important in selecting salinity-tolerant chickpea genotypes.</p>

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Improved osmotic vis-à-vis ionic stress tolerance component traits and associated gene expression bestow salinity tolerance to chickpea at the flowering stage

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • R. Suriyaprakash,
  • Lekshmy Sathee,
  • Shailesh Tripathi,
  • Aman Singh,
  • Viswanathan Chinnusamy,
  • Arun Kumar

摘要

Variations in reproductive stage stress tolerance account for the significant variations in salt tolerance of glycophytes, such as chickpeas. There is a dearth of understanding about the traits and donors for reproductive stage salinity tolerance in chickpeas. Previous studies focus on screening for seedling-stage tolerance or selection based solely on yield without examining component traits. In the present study, observations were recorded from stress and control treatments at the flowering stage from a hydroponic experimental setup. The traits measured in the study were significantly impacted by salinity, showing noticeable differences between the tolerant checks (ICCV-10 and CSG-8962) and sensitive (DCP-92-3 and Pusa-256) chickpea genotypes. The tolerant lines showed comparatively better shoot and root growth than the two sensitive genotypes. Osmotic component traits, such as retention of photosynthetic pigments, biomass, and photosynthetic rate, as well as stomatal conductance, partially contributed to the tolerance. We also found significant variations in the Na+/K+ ratio among genotypes differing in salinity tolerance, sampled at the flowering stage, suggesting variation in ionic stress and tissue tolerance. The expression of salinity tolerance-related genes in contrasting genotypes also uncovered differences in their genetic mechanisms. The key physiological traits and gene expression during the flowering stage are important in selecting salinity-tolerant chickpea genotypes.