| Wheat (Triticum aestivum L.) is one of the most important crops in China.Heat stress seriously affects yield and grain quality.Therefore,evaluating and screening heat tolerant wheat cultivars become an important research subject.In this study,fifty-three wheat cultivars and advanced lines collected from the Northern China and North Area of Huanghuai Winter Wheat Regions were selected as the experimental materials.Heat treatment simulated under plastic film covered shelter began at the 15th day after flowering,and then the agronomic traits were investigated after harvest.Heat susceptibility index,geometric mean yield and cell membrane thermostability were suggested as selection criteria for the evaluation of heat tolerance.The main results were as follows: Firstly,cultivars (lines) with STKW<1 in the three years' trials were 05CA306,Jingdong 8,Han 6228,Heng 6632,Nongda 3492,Nongda 3432,Jimai 19,Nongda 212 and Heng 4399.Secondly,cultivars (lines) with STW<1 in the three years' trials were Hengguan 216,Nongda 413,Jingdong 8,Shannong 2149,Nongda 212 and Jimai 19.Thirdly,based on the combination of both heat susceptibility index and geometric mean yield,the cultivars (lines) selected for wide utilization in agriculture production as heat tolerant wheat cultivars (lines),were Nongda 212,Nongda 3492,Jingdong 8,Jimai 19,Heng 6632,Nongda 413,Heng 4399,Shannong 2149 and Hengguan 216.Fourthly,compared with the heat tolerant cultivar TAM107,forty-four cultivars (lines) were selected as the heat tolerance varieties (lines) using cell membrane thermostability to identify the thermotolerance of the wheat seedling.Taken all together,by using cell membrane thermostability and agronomic trait,Nongda 212,Heng 6632,Nongda 3492,Jimai 19,Nongda 413,Nongda 2149 and Hengguan 216 were selected as thermotolerant varities (lines). |
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