![]() ![]() Because of the predicted rise in global temperature, heat stress-induced loss in crop economy will further expand worldwide ( Van Vuuren et al., 2009). Extreme high temperature occurs frequently across the whole world and poses a major challenge to the cultivation and utilization of most crops in temperate regions ( Sun et al., 2019). Plants often suffer from various environmental stresses in nature even cultivated crops under intensive care are easily affected by adverse environmental conditions. Genetic attributes, such as better capacity to scavenge reactive oxygen species and higher endogenous GABA content could play positive roles in alleviating heat-induced senescence, oxidative damage, and metabolic disturbance in the PROVIDENCE. Delayed leaf senescence in relation to less Chl loss was detected in the PROVIDENCE associated with maintenance of significantly higher expression levels of Chl-anabolic genes ( AsCHLH, AsPBGD, and AsPOR) and lower Chl-catabolic gene AsPPH under heat stress. In response to heat stress, the stay-green genotype PROVIDENCE exhibited significantly higher photochemical efficiency, net photosynthetic rate, transpiration rate, and water use efficiency than the heat-susceptible W6 6570. The 13M, PROVIDENCE, and LOFTS L-93 were the top three accessions with superior tolerance to heat and summer stress than other materials in terms of laboratory and field tests. Findings showed that there were significant genetic variations in physiological traits among 41 materials in response to high temperature stress. Stay-green and early-aging genotypes were selected to further reveal the potential mechanism of tolerance to senescence and heat damage associated with alterations in Chl metabolism, antioxidant and photosynthetic capacity, and endogenous γ-aminobutyric acid (GABA). Physiological traits, namely, chlorophyll (Chl) content, electrolyte leakage, photochemical efficiency, performance index on absorption basis, leaf relative water content, and osmotic potential were used to evaluate the heat tolerance of these materials in controlled growth chambers and field during summer. Forty-two accessions of creeping bentgrass ( Agrostis stolonifera), which is a cool-season perennial grass for turf and ecological remediation, were collected from 15 different countries. The evaluation and identification of genotypic variation in thermotolerance within species are critical to breeding for environmental adaptation and also provide potential materials to explore thermo-resistant mechanism in plants. Recently, extreme hot waves swept across the globe in summer, leading to enormous economic loss. High temperature limits the cultivation and utilization of cool-season plants in many regions worldwide. 2Institute of Turfgrass Science, Beijing Forestry University, Beijing, China.1College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, China.Zhou Li 1,2 * †, Mingyan Tang 1 †, Muhammad Jawad Hassan 1, Yan Zhang 1, Liebao Han 2 and Yan Peng 1 *
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