Assessment of terminal drought tolerance and yield stability in barley (Hordeum vulgare L.) genotypes via integrated parametric and non-parametric indices
نویسندگان
1 Agricultural and Horticultural Science Research Department, South Khorasan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization, AREEO, Birjand, Iran.
2 Horticulture Crop Research Department, Yazd Agricultural and Natural Resources Resaerch and Education Center, Agricultural Research, Education and Extension Organization, AREEO, Yazd, Iran.
3 Cereal Science Research Department, Seed and Plant Improvement Institute, Agricultural Research, Education and Extension Organization, AREEO, Karaj, Iran.
4 Modern systems Crop Research Division, Tehran Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization AREEO, Varamin, Iran.
5 Agricultural and Horticultural Science Research Department, Khorasan Razavi Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization, AREEO, Mashhad, Iran.
doi
10.30479/ijgpb.2026.23248.1425چکیده
To identify barley genotypes tolerant to drought stress, 19 genotypes were evaluated under field conditions over two cropping seasons (2023–2025). The study was conducted under both normal irrigation and terminal drought stress across four research stations: Varamin, Birjand, Yazd, and Kashmar. Grain yield was recorded for both environments, and nine drought tolerance/susceptibility indices (MP, GMP, TOL, HM, STI, YI, YSI, RSI, SSI) were calculated. Additionally, a suite of parametric and non-parametric stability statistics was use to assess yield stability. The results indicated that the genotypes differed markedly in their yield reduction magnitudes and responses to drought stress. Correlation analysis revealed strong, positive associations between grain yield under both conditions and the MP, GMP, HM, and STI indices. Conversely, TOL and SSI proved more effective for discriminating drought-sensitive genotypes. Parametric and non-parametric stability statistics showed a high degree of concordance in identifying stable genotypes; specifically, those with low values for Wricke’s ecovalence, Shukla’s stability variance, and the statistics of Nassar and Hühn, and Thennarasu were identified as highly stable. Based on an integrated evaluation of grain yield, drought indices, correlation analysis, and combined stability rankings, the genotypes MB-00-8, Yousef*Goharan-79, and Yousef*Fajr30-118 were identified as high-yielding, stable, and tolerant to terminal drought. Furthermore, the check cultivar Armaghan and genotype Yousef*Goharan-82 exhibited high general stability across both environments. These findings demonstrate that the simultaneous application of drought tolerance indices and parametric/non-parametric stability statistics provides an efficient and reliable approach for selecting superior barley genotypes adapted to regions prone to terminal drought stress.
