Climate change and enhanced air temperatures adversely affect the wheat’s (Triticum aestivum L.) morphological, physiological, biochemical, and molecular properties and grain yield. Therefore, developing high-yielding and resistant bread wheat cultivars to abiotic factors is vital, along with their primary source under varied environmental conditions. In the presented study, monitoring the influence of high temperatures (30 °С and above) continuously during the grain maturation period, especially in grain filling, on grain quality and productivity has undergone thorough research in the southern parts of Uzbekistan. These Southern regions mainly grow winter bread wheat cultivars. In determining the heat resistance of winter wheat cultivars typically planted in the Republic and selecting the best ones, the experiments and observations materialized with optimum and late-sowing conditions. The study determined the temperature during the growth period and daily temperatures during the grain-filling period. The research was able to evaluate the influence of air temperatures on growth phases, plant height (cm), spike length (cm), spikelets per spike, grain weight per spike, 1000-grain weight, grain nature, and protein and gluten content and compare the results under optimum and late periods.
Bread wheat (T. aestivum L.), cultivars, climate change, high temperature, heat resistance, growth phases, grain-filling period, grain yield and quality
In wheat (T. aestivum L.) cultivars with late sowing, the spiking stage began 9–10 days later than the optimum sowing. Grain yield decreased by 1.53– 2.76 t/ha and 1000-grain weight by 0.25–9.85 g due to a rise in temperature during maturation. Heat-susceptible cultivars manifested a sharp decline in their productivity.