Abstract: An experiment was conducted from September to November 2008 in greenhouse of the Science and Technology Park,China Agricultural University to examine the effect of three plant growth regulators(PGRs) on the growth,performance,and gibberellin content of tall fescue (Festuca arundinacea Schreb.).PGRs were applied 20 days after plant germination and the application regimes were paclobutrazol at 150,200,and 250 mg稬^-1;ethephon at 1000,1200,and 1400 mg稬^-1,and Aibishi at 200,250,and 300 mg稬^-1.The results show that the application of PGRs reduced plant height,especially paclobutrazol at 250 mg稬^-1,ethephon at 1200 mg稬^-1,and Aibishi at 300 mg稬^-1.Compared to the control,leaf width was reduced by paclobutrazol and Aibishi,but ethephon widened leaf blade at the beginning of the treatment.Paclobutrazol and ethephon had no effect on chlorophyll content,while Aibishi slightly enhanced the chlorophyll content in the first 2 weeks after application,and the effect gradually disappeared after 3 weeks.PGRs reduced plant gibberellin concentration by 30.6 to 64.0%.Overall,the best performance of tall fescue turfgrass was achieved by paclobutrazol application at 250 mg稬^-1.

Key words: Turf, Tall Fescue, Plant growth regulators, Gibberellin

摘要： 通过盆栽方法测定植物生长调节剂对高羊茅(Festuca arundinacea Schreb.)草坪草株高、叶宽、叶绿素含量及赤霉素含量的影响.施用多效唑、矮必施和乙烯利3种生长调节剂,各设3个浓度梯度,分别为多效唑150 mg/L、200 mg/L、250 mg/L,乙烯利1000 mg/L1、200 mg/L、1400 mg/L,矮必施200 mg/L2、50 mg/L3、00 mg/L.结果表明:施用多效唑、矮必施和乙烯利降低了草坪高度,其中以250 mg/L多效唑、1200 mg/L乙烯利和300 mg/L矮必施效果最好;3种植物生长调节剂均能对高羊茅叶片的宽度产生影响,多效唑和矮必施促使叶片变窄,而乙烯利初期使叶片变宽,后期变宽效果消失;多效唑和乙烯利都不会对高羊茅草坪的颜色产生影响,矮必施在施药后前2个星期使叶色变深,第3星期后影响逐渐消失;多效唑、乙烯利和矮必施均能促使高羊茅体内赤霉素的含量降低,降低幅度达到30.6%~64.0%.综合考虑,高羊茅草坪施用250 mg/L浓度的多效唑时效果最好.

关键词: 草坪, 高羊茅, 植物生长调节剂, 赤霉素