2,4—D和环割对苹果根系活力及多胺含量的影响

以盆栽二年生新红星苹果／湖北海棠为试材，１０月份部施用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〉精度〈

The Effect of 2,4-D and Ringing on Root Activity and Polyamines Content in Apple Roots

The ringing on trunk and the treatment of 2,4-D solution to roots were conducted in a two-year old pot-cultured apple tree (Malus pumila Mill/Malus hupenensis Rehd )on Oct. At the first week after 2, 4-D treatment, the root activity and the content of polyamines (include spermine, spermidine and putrescine)increased, and decreased after trunk ringing in all roots. At the 4th week, the root activity and polyamines content did not change significantly in absorbing roots after both treatments but activity and polyamines of extensive/transitiona roots were increased. The order of polyamines correlating coefficient to root activity is polyamines > spermine > spermidine > putrescine.