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以盆栽二年生新红星苹果／湖北海棠为试材，10月份根部施用2，4－D30μg·g-1水溶液和主干环割，处理后第一周和第四周测定过渡根、延长根和吸收根内源多胺（精胺、亚精胺和腐胺）含量及根系活力。结果表明：2，4-D处理后第一周，根系活力和内源多胺含量升高；第四周除吸收根变化不明显外，其他两类根活力和内源多胺含量上升。统计分析表明，根系活力与内源多胺含量显著相关，相关系数由大到小依次是多胺总量＞精胺＞亚精胺＞腐胺。
The potted perennial New Star apple / Begonia officinalis was used as test material, and the roots were treated with 2,4-D30μg · g-1 aqueous solution and trunk ring cut in October. The root and root elongation were measured in the first week and the fourth week after treatment Endogenous polyamines (spermine, spermidine and putrescine) content and root activity. The results showed that in the first week after 2,4-D treatment, root activity and endogenous polyamines contents increased. In the fourth week, the contents of endogenous polyamines and endogenous polyamines increased except for the changes of their absorption roots. Statistical analysis showed that there was a significant correlation between root vitality and endogenous polyamine content, the correlation coefficient descending order was polyamine total> spermine> spermidine> putrescine.