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<p>Expanding the cultivation of pearl millet into salt-affected soils necessitates the development of genotypes with enhanced sodicity tolerance. Evaluating the tolerance levels of existing cultivars is a crucial first step in this direction. Thus, in this study, we assessed the performance of 23 genetically diverse pearl millet hybrids through a semi-controlled pot experiment under control (pH ~ 7.5) and sodic (pH ~ 9.2) conditions during the seedling-to-vegetative stage. A comprehensive assessment of 14 morphological and physiological traits revealed significant genotype, treatment, and genotype × treatment interactions, highlighting the varied responses of hybrids to sodic stress. Among the measured parameters, root biomass showed the most significant reduction (65.88%) under sodicity, while relative water content was the least affected (12.2%). Sodium accumulation in both the shoot and root negatively correlated with all morphological traits, emphasizing its harmful impact on growth. Based on ion homeostasis and growth performance, hybrids JKBH 1326 and RHB 234 displayed superior ion exclusion mechanisms, whereas BHB 1602 and HHB 67 IPM exhibited tissue tolerance. Membership function values derived from stress tolerance indices identified HHB 67 IPM, MPMH 17, RHB 234, and GHB 1129 as the most promising genotypes under sodic stress. Furthermore, random forest modeling and SHAP (SHapley Additive exPlanations) analysis indicated that soil nitrogen, and potassium were the primary determinants of shoot and root biomass in sodicity. These findings offer essential insights into the morphological and physiological responses of pearl millet to sodicity and pinpoint promising hybrids for potential cultivation in degraded soils, warranting further validation under field conditions.</p>

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Evaluation of pearl millet hybrids for salt tolerance: Na+ and K+ dynamics under normal and sodic conditions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月30日

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  • K. T. Ravikiran,
  • Sanjay Arora,
  • Vikas Khandelwal,
  • Sanjana P. Reddy,
  • Anoop Kumar Dixit,
  • Rajender Kumar Yadav

摘要

Expanding the cultivation of pearl millet into salt-affected soils necessitates the development of genotypes with enhanced sodicity tolerance. Evaluating the tolerance levels of existing cultivars is a crucial first step in this direction. Thus, in this study, we assessed the performance of 23 genetically diverse pearl millet hybrids through a semi-controlled pot experiment under control (pH ~ 7.5) and sodic (pH ~ 9.2) conditions during the seedling-to-vegetative stage. A comprehensive assessment of 14 morphological and physiological traits revealed significant genotype, treatment, and genotype × treatment interactions, highlighting the varied responses of hybrids to sodic stress. Among the measured parameters, root biomass showed the most significant reduction (65.88%) under sodicity, while relative water content was the least affected (12.2%). Sodium accumulation in both the shoot and root negatively correlated with all morphological traits, emphasizing its harmful impact on growth. Based on ion homeostasis and growth performance, hybrids JKBH 1326 and RHB 234 displayed superior ion exclusion mechanisms, whereas BHB 1602 and HHB 67 IPM exhibited tissue tolerance. Membership function values derived from stress tolerance indices identified HHB 67 IPM, MPMH 17, RHB 234, and GHB 1129 as the most promising genotypes under sodic stress. Furthermore, random forest modeling and SHAP (SHapley Additive exPlanations) analysis indicated that soil nitrogen, and potassium were the primary determinants of shoot and root biomass in sodicity. These findings offer essential insights into the morphological and physiological responses of pearl millet to sodicity and pinpoint promising hybrids for potential cultivation in degraded soils, warranting further validation under field conditions.