水分胁迫对菘蓝生长发育和有效成分积累的影响

Effect of water stress on growth and accumulation of active components of Isatis indigotica

目的：研究不同水分对菘蓝生长发育和主要有效成分的影响。方法：采用室外盆栽水分胁迫试验方法,对水分胁迫条件下菘蓝需水规律、叶绿素含量、蒸腾速率、光合速率、生物量指标以及有效成分靛玉红积累进行了研究。结果：水分胁迫程度增加,需水量、叶绿素含量降低,蒸腾速率、光合作用和生物量均降低,但水分利用效率提高。结论：菘蓝需水的关键时期是7月,严重水分胁迫和水分过多都不利于靛玉红含量积累,中度水分胁迫能促进根部靛玉红含量积累,大青叶7月为最佳采收期,板蓝根10月采收较适宜。当田间最大持水量为45%~70%,菘蓝的产量与质量可以兼优。

Objective： To study the effect of water stress on the growth and accumulation of active components of Isatis indigotica. Method： By pot culture experiment,the characteristic indexes of water requirement,chlorophyll content,transpiration rate,photosynthesis,biomass and effective ingredient indirubin were studied under normal and water stress conditions,respectively.Result： With the increase of the extent and duration of water stress,the quantity of water requirement,chlorophyll content,respiration rate,photosynthesis and biomass of I.indigotica were decreased,while water use efficiency increased.Conclusion： It is a critical period of water requirement in July,high water content in soil and extreme water stress are not propitious to the accumulation of indirubin,appropriate water stress can stimulate indirubin accumulatio.The harvest of leaves of I.indigotica is optimal in July,while the harvest of root is appropriate in October.Yield and quantity of I.indigotica are improved when the field capacity is between 45% and 70%.