不同短截处理对苹果树体内源激素含量的影响

以三年生红富士（Mlaus domestica Borkh.cv.Red Fuji）/SH/八棱海棠（Malus micromalus Makino）为试材，研究不同短截程度对苹果树体内源激素含量变化的影响。结果表明，不同短截处理均降低了植株茎尖、 细根内吲哚乙酸（IAA）含量。春梢开始生长期茎尖脱落酸（ABA）含量重短截中短截轻短截，分别为224.85、 204.95和189.16 ng/g, FW，重短截与对照处理间差异不显著。春梢旺长期和春梢缓长期4个处理茎尖及细根ABA含量呈重短截中短截轻短截对照的趋势。不同处理间植株茎尖、 细根中赤霉素（GA）、 玉米素核苷（ZR）含量变化不显著。在整个春梢生长期，4个处理下茎尖和细根的(IAA+GA+ZR)/ABA 比值随短截程度加重而降低，短截处理降低了茎尖IAA、(IAA+GA+ZR)/ABA，提高了ABA含量，一定程度上削弱了生长势，抑制了新梢生长。

Effects of pruning? length on dynamic changes of endogenous hormones in apple tree

Three-year-old apple trees (Mlaus domestica Borkh.cv.Red Fuji) /SH/ Malus micromalus Makino were used in the present study to explore the effects of short-cutting on the dynamic changes of endogenous hormones. The results showed that the level of endogenous IAA in shoot tip and fine root was reduced. In the early vigorous growing period of shoots, the content of ABA in shoot tip ranked in the following order: heavy short-cutting middle short-cutting light short-cutting, which were 224.85 ng/g, FW, 204.95 ng/g, FW and 189.16 ng/g FW respectively. And no significant difference was observed between heavy short-cutting and the control. At vigorous growing period and slow growth period of shoots, the content of endogenous ABA in shoot tip and fine root of short-cutting was significantly higher than that of control, whereas the change of the level of ZR and GA showed no significant difference. The ratio of (IAA+GA+ZR)/ABA in shoot tip and fine root decreased along with the increase of pruning cut length.