@Article{phyton.2026.086460,
AUTHOR = {Nadira Mokarroma, Imrul Mosaddek Ahmed, Md. Romij Uddin, Md. Shihab Uddine Khan, Zakaria Alam, Nahid Afridi, Sadia Afroz Ritu, Md. Motiar Rohman, Suman Biswas, Abul Fazal Mohammad Shamim Ahsan, A. A. M. Mohammad Mustakim, Hela Znazen, Ahmed Gaber, Akbar Hossain},
TITLE = {Exploring Qualitative and Quantitative Genetic Variations of Barley (<i>Hordeum vulgare</i> L.) Genotypes Grown under Heat Stress Conditions},
JOURNAL = {Phyton-International Journal of Experimental Botany},
VOLUME = {},
YEAR = {},
NUMBER = {},
PAGES = {{pages}},
URL = {http://www.techscience.com/phyton/online/detail/27628},
ISSN = {1851-5657},
ABSTRACT = {Heat stress is a major abiotic constraint limiting barley (<i>Hordeum vulgare</i> L.) productivity in regions experiencing rising temperatures. This study evaluated the genetic variability and morphophysiological as well as yield responses of 50 barley genotypes under control and heat-stressed conditions to identify superior lines for thermotolerance breeding. A completely randomized design (CRD) with replications was used, and data was collected for ten morpho-physiological and yield traits. Analysis of variance (ANOVA) indicated highly significant (<i>p</i> ≤ 0.001) effects of genotype, treatment, and their interaction on most of the measured traits. Wide phenotypic variation was observed for grain yield (1.62–9.60 g plant<sup>−1</sup>) and thousand-grain weight (19.18–40.02 g). High genotypic and phenotypic coefficients of variation, heritability, and genetic advance for grain yield plant<sup>−1</sup>, total biomass accumulation plant<sup>−1</sup>, and leaf area plant<sup>−1</sup> indicated strong additive genetic control. Correlation and network analyses showed strong positive associations among plant height, total biomass accumulation plant<sup>−1</sup>, chlorophyll content, leaf area plant<sup>−1</sup>, thousand-grain weight, and grain yield plant<sup>−1</sup>. Heatmap clustering and the multi-trait genotype-ideotype distance index (MGIDI) identified BD7194, BD7188, BD8579, BD9681, and IBON14 as best heat-tolerant genotypes. Principal component analysis (PCA) revealed variation primarily driven by grain yield plant<sup>−1</sup>, leaf area plant<sup>−1</sup>, and number grains spike<sup>−1</sup>. Overall, these findings demonstrate substantial genetic variation for heat tolerance and identify promising genotypes that can be used as valuable resources for developing climate-resilient barley cultivars suited to heating environments.},
DOI = {10.32604/phyton.2026.086460}
}