Vegetos
(An International Journal of Plant Research & Biotechnology)
(eISSN: 2229-4473)
Response of bread wheat inbred lines (Triticum aestivum L.) in drought-stress using drought tolerance indices
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Abbasi Holasou Hossein, Talebzadeh Zoleikha, Hasanzadeh Gorttapeh Abdollah
Research Article | Published: 10 August, 2026
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Keywords: Drought stress, Drought tolerance, Selection indices, Yield and yield component
Abstract
The most of bread wheat cultivation areas in Iran are located in cold, arid and semi-arid regions therefor, achieving to high yielding cultivars with appropriate adaptation to various climatic conditions and drought tolerance is necessary. In order to study some agronomic characteristics, to determine suitable drought tolerance indices and to identify drought tolerant wheat genotypes, 15 bread wheat genotypes collected from Pars Agro-Industrial and Livestock Company were evaluated in two separate experiments (stress and non-stress conditions) with a randomized complete block design with three replicates at research field of agricultural and natural resources research center of West Azerbaijan, Iran during 2016–2017 and 2017–2018 cropping year. Drought tolerance indices including stress tolerance, stress susceptibility index, mean productivity, geometric mean productivity, stress tolerance index, harmonic mean and selection index of ideal genotype of traits were calculated. The results of combined analysis of variance showed significant differences between genotypes in all of the traits (except 1000-grain weight) in drought stress and supplementary irrigation conditions. Evaluation of drought stress tolerance using different stress tolerance indices while confirming the existence of genetic diversity showed that genoypes/lines Darya, ERWYT2 and ERWYT1 under normal irrigation and URBWYT4, Karim and URBWT2 with high grain yield in drought stress conditions have high drought tolerance. Based on the SIIG index, the genotypes Darya, URBWYT4, ERWYT5, ERWYT1, URBWYT5 and ERWYT3 with the highest SIIG values (0.838, 0.795, 0.736, 0.724, 0.696 and 0.665, respectively) were the best genotypes. On the other hand, URBWYT3 and Morvarid genotypes with the least amount of SIIG value (0.197 and 0.257, respectively) were the weakest genotypes for most studied traits. The genotypes of Darya, URBWYT4, ERWYT5, ERWYT1, URBWYT5 and ERWYT3 with high SIIG value and higher seed yield that total average were recognized as superior genotypes from the point of yield and other agronomic traits. Therefore, these genotypes can be used for further testing, including adaptation tests in cold, arid and semi-arid regions.
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Author Information
Crop and Horticultural Science Research Department, Kurdistan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Sanandaj, Iran