Effect of high temperature stress at anthesis on seed vigor of wheat
[Objective]To clarify the effect of post-anthesis high temperature treatment on grain germi-nation and growth,and explore the psychological mechanism of wheat response to the stress of post-anthesis high temperature.[Methods]Xinchun 11,the main wheat cultivar in Xinjiang,was chosen as the model of crop.The mature wheat seeds were treated with the high temperature for 5 days to 8 days after flowering,and then the germination characteristics and the related enzymes activities associated with the oxidative stress of the seeds were examined.[Results]After high temperature treatment,the germination rate and germination po-tential of wheat grains were significantly reduced compared with the photo comparison(5.10%and 3.22%,respectively),and the conductivity index was significantly higher than that of the control(22.78%higher).After high temperature treatment,the bud length and fresh weight of wheat grain germination and growth de-creased by 17.98%and 12.84%compared with the CK,the germination index and vigor index decreased sig-nificantly in wheat grain germination.The change in seed viability(ttc reduction intensity)was not signifi-cant,but the decrease was 26.02%.Meanwhile,the germination index and vigor index both decreased signif-icantly in wheat grain germination.The change in seed viability(TTC reduction intensity)was not significant,but the decrease was 26.02%.[Conclusion]The results showed the high temperature stress at anthesis might have significant effects on wheat seed enzyme activity,and could further cause the decrease of the seed vigor and weaken the growth of wheat as a seedling,which might affect the wheat production ultimately.
wheatseed germinationpost-anthesis high temperatureamylaseperoxidase
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