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| Effects of high temperature stress in different periods after |
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| Abstract: |
| In order to study the effects of high temperature stress in different periods after anthesis on spring wheat fluorescence parameters，Ningchun4 and Ningchun47 were selected as the materials，which were planted in flowerpot in artificial climatic chamber. The results showed that，under high temperature stress，the value of F0，Fm，Fv/Fm，Fv/Fo，PI of flag leaf all declined，and the earlier of high temperature treatment，the greater of the decline. Compared with the CK，the F0 value decreased by 24.02%-24.43%，Fm decreased by 27.09%-19.63%，Fv/Fm decreased by 19.23%-30.80%，Fv/F0 decreased by 43.64%-40.34%，PI decreased by 66.95%-69.39%. The treatment of high temperature in different periods after anthesis could also decrease grain weight per spike，1000-grain weight and
biomass of spring wheat，and the earlier of high temperature treatment，the greater of the decline. The 1000-grain weight of Ningchun47 reduced from 17.42% to 37.55% and Ningchun4 reduced from 36.74% to 52.18%. High temperature after anthesis destroyed PSⅡ，decreased the chlorophyll fluorescence of spring wheat，then reduced grain weight and yield.Comparision of the two varieties showed that Ningchun4 was more sensitive to high temperature，so the yield declined under high temperature treatment after anthesis，but Ningchun47 was resistant to high temperature. |
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