PJB-2024-559
ASSESSING SALT TOLERANCE IN SOME SYNTHETIC LINES OF WHEAT (Triticum aestivium L.) AT EARLY SEEDLING STAGE
Muhammad Ubaidullah shirazi
Abstract
Twelve advanced synthetic wheat (Triticum turgidum × Aegilops squarrosa) lines were tested to assess the salt tolerance potential of these lines at early seedling stage. The studies were conducted in water culture using ½ strength nutrient solution, in programmed controlled growth cabinets. The genotypes were exposed to control (ECw = 1.9 dS/m) and saline (ECw =16 dS/m NaCl), arranged in randomized manner, replicated thrice. The experiment was continued for 10 days. The genotypes were categorized on the basis of salt tolerance trait indices (STTI) of multiple growth parameters i.e. shoot & root length, shoot & root fresh and dry weights, root morphology and ionic relations (K/Na ratio). Three genotypes (Syn-4, Syn-5 and Syn-9) were categorized as tolerant, five (Syn-2, Syn-3, Syn-13, Syn-17 and Kiran-95) as medium tolerant, four (Syn-6, Syn-8, Syn-19, Syn-25) as medium sensitive and one (Syn-30) as sensitive. It was also observed that among the tolerant genotypes Syn-5 and Syn-4 have comparatively high potassium accumulations under salinity. Potentially tolerant genotypes at early seedling stage will be included in our ongoing breeding program to improve salt tolerance potential of commercially available high yielding wheat varieties.
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