仁用杏3个生理指标与抗寒性的关系研究

对低温胁迫下3个仁用杏品种1 a生休眠枝中可溶性蛋白质含量、SOD和POD酶活性的变化及与抗寒性的关系进行了研究。结果表明，随着温度的降低，可溶性蛋白质含量、SOD和POD活性呈现先上升后下降的变化趋势，且与仁用杏抗寒性呈正相关关系。但可溶性蛋白与抗寒性相关性较小，不宜单独用作抗寒性鉴定指标。SOD和POD活性与抗寒性相关密切，-24℃时的SOD活性或-28℃时的POD活性可作为快速鉴定仁用杏抗寒性的指标。3个仁用杏品种休眠期的半致死温度分别为 一窝蜂-53.7℃、优一-50.8℃、龙王帽-36.0℃，其抗寒性排序为一窝蜂>优一>龙王帽。第3期杨向娜等仁用杏3个生理指标与抗寒性的关系研究

Studies on Relationships Between Soluble Protein Contents ,SOD and POD Activity and Cold Resistant Ability of 3 Apricot Varieties

The changes of soluble protein contents,superoxide dismutase (SOD) and peroxidase(POD) activities and their relationship with cold resistant ability in year dormancy wattles of 3 varieties apricot under high cold stress were studied. The results showed that, with the temperature going down, the trends of soluble protein contents, SOD and POD activity increased at first,then decreased. They were all positively correlated with cold resistant ability of apricot. But there was little correlation between the content of soluble protein and the cold resistance, indicating that the content of soluble protein was not suitable to be used as a appraisal index independently for cold resistance in apricot . SOD and POD activities were closely related to the cold resistance .SOD activity at -24℃ and POD activity at -28℃ could be used as rapid indexes in cold resistance identify for apricot. The critical lethal temperature of 3 varieties of kernel apricot in oneyeardormancy were -53.7℃ (Yiwofeng),-50.8℃ (Youyi) and -36.0℃ (Longwangmao) respectively. As a result, the order of cold resistance for three varieties studied was Yiwofeng> Youyi>Longwangmao.