PJB-2024-587
Characterization of salinity tolerance in wheat (Triticum aestivum L.) genotypes a hydroponic system: Insights into growth, physiology, and ionic regulation
Sobia Akram
Abstract
This study aimed to evaluate the performance of different wheat genotypes under salinity. The hydroponic setup provided precise control over salinity, allowing for accurate assessment of genotype responses. We evaluated 24 wheat genotypes at 100 mM,140 mM and 200 mM NaCl treatments. Among the genotypes tested MH-21 and SARC-4 exhibited notable salt tolerance, displaying minimal reductions in growth and maintaining high SPAD values. Conversely, Lasani 2008 and AARI-11 demonstrated sensitivity, showing significant decreases in growth parameters. Furthermore, the measurement of MSI and RWC indicated that the salt-tolerant genotypes maintained better cellular membrane stability and water retention capacity up to 21% and 41% under high salinity stress compared to the salt-sensitive genotypes. Ionic analysis revealed that the salt-tolerant genotypes MH-21 and SARC-4 exhibited efficient ion regulation, with lower Na+ accumulation up to 86% and 85% and higher K+ retention up to 62 % and 58% at higher salinity level compared to the salt-sensitive genotypes Lasani 2008 and AARI-11. This suggested that ion homeostasis and selective ion uptake mechanisms play a critical role in salt tolerance in wheat. MH-21 and SARC-4 were ranked as salt tolerant genotypes in Principle Component Analysis based on Salt Tolerance IndexTDM and Salt Tolerance IndexK+/Na+.
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