| The objective of this study was to evaluate the heat resistance of 19 spring wheat cultivars in Xinjiang, which was based on simulated heat treatment at grain filling stage of wheat. Yield index, heat susceptibility of thousand-kernel weight and heat susceptibility of test weight index were suggested as selection criteria for the evaluation of heat resistance. The results showed that high temperature stress reduced biological yield, harvest index, grain weight per spike, thousand-kernel weight, volume weight and grain yield, and the reduction of grain yield was mainly attributed to the decrease of thousand-grains weight. Xinchun 6, Xinchun 9, Xinchun 11, Xinchun 17, Xinchun 22, Xinchun 27, Xinchun 31, Xinchun 33 and Xinchun 37 performed high yield under both heat-stress and normal environments, among these cultivars Xinchun 6 and Xinchun 37 has higher yield. Cultivars with heat susceptibility of thousand-kernel weight (SKGW) <1 in this study were Xinchun 6, Xinchun 17, Xinchun 22, Xinchun 26, Xinchun 29, Xinchun 32, Xinchun 34, Xinchun 36, Xinchun 40 and Xinchun 41. Cultivars with heat susceptibility of test weight (SVW)<1 in this study were Xinchun 6, Xinchun11, Xinchun 17, Xinchun 22, Xinchun 27, Xinchun 32, Xinchun 33, Xinchun 34,Xinchun 39 and Xinchun 40. Based on the combination of both yield index and heat susceptibility index, Xinchun 6, Xinchun 17, Xinchun 22 and Xinchun 37 were characterized with high resistance to heat stress, which should be widely utilized in agriculture production. Xinchun 40 performed high yield and higher thousand-kernel weight under both normal and heat-stress environments, with SKGW<1 and SVW<1, which can be used as a heat resistance breeding parent. Xinchun 41 has higher thousand-kernel weight under normal and heat-stress environments,which can be used as a heat resistance germplasm resource. |
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