李莉

摘 要：为解决党参连作障碍，优化党参产业种植模式，寻找适合与党参轮作的玉米品种，以晋单56，晋单78，郑单958和郑单1002为材料，通过室内培养法，研究了党参提取液对玉米种子萌发和幼苗根系生长的影响，探讨党参提取液对玉米生长的影响。结果表明，党参提取液对4种玉米均具有不同程度影响，其中，对晋单56号具有双重化感作用，即低浓度促进生长，高浓度抑制生长。对晋单78和郑单1002的种子萌发具有抑制作用，对幼苗生长具有低促高抑的作用。对郑单958玉米种子和幼苗均具有较显著的抑制作用，且随着浓度的升高抑制作用增强。

关键词：党参提取液;玉米;种子萌发;根系生长

中图分类号：S565.1                        文献标志码：A

Effects of Codonopsis pilosula Extract on Seed Germination and Root Growth of Maize

LI Li

（Department of Biological Sciences and Technology， Changzhi University，

Changzhi， Shanxi 046011， China）

Abstract：To tackle the monocropping obstacle and optimize the planting pattern of Codonopsis Pilosula， an experiment was conducted to find out the suitable maize variety for rotation with Codonopsis Pilosula. The effect of Codonopsis Pilosula extract on the seed germination and root growth of maize was studied by indoor incubation method， and the maize varieties： Jindan56， Jindan78， Zhengdan958 and Zhengdan1002 were used as tested materials. The results showed that Codonopsis pilosum extract had different effects on 4 kinds of maize. It promoted the seed germination and root growth of Jindan 56 at low concentration， but turned out contrary at high concentration. It inhibited the seed germination of Jindan 78 and Zhengdan 1002， and promoted the root growth at low concentration， while had inhibitory effects at high concentration. It significantly inhibited the seed germination and root growth of Zhengdan 958， and the inhibition strengthened with the increase of concentration.

Key words： Codonopsis pilosum extract; maize; seeding germination; root growth

黨参（CodonoPsis pilosula）属桔梗科党参属，多年生草本植物，传统的补益药，具有提高免疫力，改善微循环，增强造血功能等作用[1-3]。赵庆芳[4]等研究显示，经党参植株水提液处理后的党参种子萌发速度缓慢，萌发率显著降低，幼苗生长受到明显的抑制，甚至停止生长。研究表明[5，6]，化感自毒作用是造成药用植物连作障碍的重要原因之一。目前轮作、间作、套种是减轻连作障碍，改善土壤环境，实现土地资源综合利用最简单有效的途径[7]。根系不仅起着固着、支撑的作用，同时也是植物吸收水分和养料的重要器官。根系的生长及形态建成对化感物质更为敏感[8]。受试植物根系响应是化感作用研究的重要指标，研究党参提取液对4种玉米的种子萌发及根系生长的影响，寻找适合与党参轮作的玉米品种，为优化党参种植模式，提高党参品质提供一定的参考。……