3种植物生长调节剂对七彩朱槿生理指标的影响

目的]探讨植物生长调节剂对七彩朱槿生长影响的生理机制。方法]采用L16(43)的正交试验设计,研究多效唑(PP333)、矮壮素(CCC)、比久(B9)3种植物生长调节剂对盆栽七彩朱槿叶绿素含量以及POD、CAT、NR的影响。结果]叶施与根施生长调节剂对七彩朱槿的生理影响效果不同。叶施生长调节剂对叶绿素含量、POD和CAT的影响大于根施;而根施对NR的促进作用大于叶施,含高浓度CCC(4 000 mg/L)的瑏瑤、瑏瑥、瑏瑦处理的NR明显高于对照。3种生长调节剂中,CCC对七彩朱槿NR的影响最显著,其中根施CCC处理的影响达极显著水平。结论]合理使用植物生长调节剂,不仅能起到化学修剪的作用,同时可以增强七彩朱槿的光合作用能力、抗性以及对氮肥的利用能力。

Effects of Three Plant Growth Regulators on the Physiological Indices of Hibiscus Rosa-sinensis

Objective] The research aimed to explore the physiological mechanism that plant growth regulators made effects on the growth of Hibiscus Rosa-sinensis.Method] The experiments were conducted as the orthogonal design of L16(43) to study the effects of three plant growth regulators,namely PP333,CCC,B9,on th e chlorophyll content,POD,CAT and NR of Hibiscus Rosa-sinensis grown in pot.Result] The effects on the physiological indices of Hibiscus Rosa-sinensis between foliar fertilization and root fertilization of PP333,CCC and B9 were different.The effects on the chlorophyll content,POD and CAT made by foliage fertilization were more obvious than by root fertilization,but it was opposite to NR,and the values of NR of Hibiscus Rosa-sinensis treated by the 14,15 and 16 combinations,which all contained CCC in high concentration(4 000 mg/L),were significantly higher than CK.Among the three plant growth regulators,CCC had made the most significant effect on NR of Hibiscus Rosa-sinensis,especially by the way of root fertilization,and the difference could reach extremely significant level compared with the others.Conclusion] Rational use of plant growth regulators on Hibiscus Rosa-sinensis,not only could play the role of chemical pruning,but also enhance its photosynthetic capacity,the abilities of resistance and to use nitrogen.