盐胁迫对松果菊生长及其菊苣酸含量的影响

为了探讨盐胁迫对松果菊生长及其药用成分菊苣酸含量的影响，分别以0、30、60、90、120和150 mmol?L-1的NaCl处理土培的松果菊植株，并测定处理后的松果菊盐害指数、鲜重、干重以及菊苣酸含量。结果表明：盐害指数随着盐浓度的升高而升高；120 mmol?L-1及以下浓度的NaCl处理对松果菊鲜重影响并不明显，而150 mmol?L-1时则使鲜重显著降低；随着盐浓度的升高，松果菊干重呈逐渐减小的趋势；菊苣酸含量随盐浓度的升高呈先升高再下降的趋势，在90 mmol?L-1时达到最大值；菊苣酸的单株产量在盐浓度为0~60 mmol?L-1时无显著变化，在90 mmol?L-1时显著升高，之后显著降低。盐胁迫虽然对松果菊生长产生了一定的盐害作用，但在一定的盐浓度范围内（0~90 mmol?L-1）也同时提高了菊苣酸的含量水平。

Effects of Salt Stress on Growth and Cichoric Acid Content of Echinacea purpurea

To study the effects of NaCl on the growth and cichoric acid content of Echinacea purpurea, 0, 30, 60, 90, 120 and 150 mmol?L-1 NaCl were treated to E. purpurea cultivated in garden soil, and salt injury index, fresh weight, dry weight and cichoric acid content were determined. The results showed that: with the increase of NaCl concentration, salt injury index increased as well; less or equal than 120 mmol?L-1 NaCl did not bring obvious influence to the fresh weight of E. purpurea, while 150 mmol?L-1 NaCl markedly decreased their fresh weight; the dry weight of E. purpurea reduced gradually as salt concentration rose; cichoric acid content increased first and then decreased with the increase of salt concentration, getting to the maximum value at 90 mmol?L-1 NaCl level; cichoric acid production per plant showed no significant change between 0 and 60 mmol?L-1 NaCl, increased significantly at 90 mmol?L-1 and then decreased obviously. Although salt stress caused a certain degree of salt damage to E. purpurea, it increased cichoric acid content within a certain salt concentration (0~90 mmol?L-1）.