Objective]Respiration intensity is closely related to cold resistance of plants,and temperature is an important factor affecting respiration. On the basis of preliminary identification of the cold resistance,this study explored changing trends of relevant physiological indexes during dormancy of different cold-resistant hazel hybrids,and physiological mechanisms to adapt to the low-temperature environment,to provide abasis forfurther studyingcold resistance of hybrid hazels.[Method]The phenology of three clones (84 -349,84 -237 and 84 -572) with different coldresistance, which were selected in our previous experiments,were observed. We measured respiration rate,branches electrolyte leakage,and soluble protein content and soluble sugarscontentsof shoots of the three clones during dormancy,to explore the relationship between dormancy and cold resistance.[Result]The strong cold resistance clone,84 - 349,was the earliest to enter the dormant period and the latest to bloom;There were no differences in physiological indexes during the deep dormancy over the three clones. However,in the early stage and late stage of dormancy,the clone of 84 -349 had the lowest respiration rate,the least electrolyte leakageand the highest soluble sugar and soluble protein contents. Whereas the weak cold resistance clone,84 -572,was opposite,with thehighest electrolyte leakage,highest respiration,and the lowest soluble sugar and soluble protein contentsamong the three clones.[Conclusion]Three hybrid hazelnut clones with different cold resistance had different physiological performancesin dormancy. Compared with the weak cold resistance clones,thestrong cold resistancecloneresisted low temperatureby early entering dormancy, reducing respiration rate, lowering the electrolyte leakage and increasing storage ofenergy matter indormancy.%【目的】本研究在前期抗寒性鉴定的基础上，探求不同抗寒性杂交榛休眠期间相关生理指标的变化趋势，探讨杂交榛适应低温环境的生理机制，为杂交榛抗寒性后续研究提供依据。【方法】根据前期试验选出抗寒性强(84－349)、中(84－237)、弱(84－572)3个无性系进行物候期观察，对3个无性系休眠期间枝条的呼吸强度、电解质渗出率、可溶性糖和可溶性蛋白含量进行测定。【结果】抗寒性强的84－349进入休眠期最早，开花最晚；休眠过程中，深休眠期不同抗寒性的杂交榛无性系各生理指标差异不明显，而休眠初期和休眠后期，抗寒性强的无性系84－349呼吸强度最低、电解质渗出最低、可溶性糖和可溶性蛋白含量最高，而抗寒性弱的无性系84－572正好与之相反。【结论】抗寒性不同的3种杂交榛无性系休眠期表现的生理机制不同，抗寒性强的无性系和抗寒性弱的无性系比较，通过提早进入休眠期、降低休眠期呼吸强度、较低的电解质渗出率和储存更多的能量物质来抵御低温。
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机译：Study on Segregation of Fruit Characters and Primary Selection of Excellent Single Plants from the Hybrid Population of Corylus heterophylla×C.heterophylla × C.avellana平榛×平欧榛杂交群体果实性状的分离及优良单株的初选研究
