红霞杨的抗热性研究

Study on the Thermal Resistance of Populus euramericana cv.‘Hongxia’

为提高红霞杨的抗热性,通过自然遮荫、人工遮荫和喷洒不同浓度的细胞分裂素(KT)试验,分别测定了红霞杨叶片中的可溶性糖、可溶性蛋白、游离脯氨酸、超氧物歧化酶(SOD)及过氧化物酶(POD)等抗性生理指标,并观察了田间叶色表现及生长状况。结果表明:自然遮荫条件下的东遮荫,人工遮荫条件下的80%遮荫度和喷洒500 mg·kg^(-1)的细胞分裂素(KT),抗性指标值最大,田间叶色表现正常,生长状况良好。可见采用适度遮荫和适度喷洒细胞分裂素(KT)措施,能提高红霞杨的抗热性,有效预防焦叶现象的出现,有利于红霞杨安全越夏。

In order to improve the heat resistance of Populus euramericana cv.'Hongxia',by natural shade,artificial shade and spraying different concentrations of cytokinin(KT)tests,we determined the physiological indexes of soluble sugar,soluble protein,free proline,superoxygen dismutase(SOD)and peroxidase(POD)in the leaves of Populus euramericana cv.'Hongxia',and observed the color performance and growth status of leaf in the field.The results showed that:east shade under natural shade,80%shade under artificial shade,and cytokinin(KT)sprayed with 500 mg·kg^-1,the resistance index was the largest,the leaf color in the field was normal,and the growth was good.It ould be seen that the measures such as moderate shade and moderate spraying of cytokinins(KT)can improve the heat resistance of Populus euramericana cv.'Hongxia'and effectively prevent the appearance of cotyledons,which is conducive to the summer of Populus euramericana cv.'Hongxia'.